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We live in a world that thrives on digital connectivity. According to We Are Social, Canadians are now spending half a day more a month online than they did a year ago. Also, 33 million Canadians logged on to the internet at least once a month in 2020. As more people every year are spending hours upon hours online, they are knowingly (and sometimes unknowingly) unsafely releasing their personal information into the digital ether, making them vulnerable to all sorts of cybercrimes. The ramifications range anywhere from malware infection to identity fraud. Better understanding the best practices for online sharing will ensure users can navigate online dangers and safely connect with others.
Here are three ways online users share too much information and how they are placing themselves at risk.
Think about how many websites you visit regularly. How many of these have access to your personal information, such as your email, credit card numbers, and shipping address? Before accepting the option to save your information on file for a “faster checkout experience,” consider the following: A Canadian Internet Registration Authority polled 500 IT security professionals, and a quarter of them experienced a breach of customer data in 2020. Online users cannot afford to take liberties with the information they hand over to online companies, especially if they subscribe to numerous sites.
On a similar note, it is equally inadvisable to hand over information about yourself. Although seemingly harmless, online quizzes may not be as safe as you think. Some quiz questions sound more like security questions such as, “What was the first car you owned?” or “Where did you grow up?” Hackers using spyware can access these answers and anything else you enter on quiz sites to formulate informed guesses at your passwords.
It may seem counterintuitive not to share information on social media, seeing as the purpose of these platforms is to share. However, the problem with social media is that too many people are leaving themselves exposed to hackers due to the specificity of the information they share. More than two-thirds of Canadians are on social media, according to Statista, meaning there are millions of user profiles and newsfeeds brimming with personal information. Specific information such as company details in a new job announcement or your birth date in a celebration post are details hackers can use to impersonate you or break into your accounts. Additionally, cybercriminals can impersonate people in your network or pose as average users and add you as a friend. Hackers will often use this tactic to get close to someone and gather intel to formulate a targeted phishing attempt or identity theft.
While you can take proper precautions to safeguard your personal information, you cannot guarantee that others will do so with the same vigilance. Many do not realize there is more at stake than a loss of privacy when intentionally sharing information, usually login credentials, with others. If your friend you shared your password with is hacked, then a cybercriminal can now access your information as well as theirs. Cybercriminals can then use this information to break into your accounts, hold your data for ransom, and even steal your identity.
Knowing what is safe to share online and how to protect the information that is not is the first step to safeguarding your online presence. Here are four tips to consider before sharing your personal details on websites, social media, and with others:
Always err on the side of caution whenever you visit unknown sites or download applications on your devices. Be aware of what you click on, the ramifications of clicking on a malicious link, or handing over information on an unsecured website. One way to ensure you are visiting a secure website is to look for the padlock icon in the top left corner of your browser. This icon indicates the site and your connection are secure.
Take your internet protection one step further and avoid saving your information on file. If possible, use an alternate payment gateway with verified encryption that does not require inputting your credit card information. This way, your data does not become a liability in the event of a company data breach.
There’s a fine line between sharing too much and sharing just enough on social media. Start taking control of your privacy on social media by adjusting your privacy settings. Unless you are an aspiring social media influencer, it is best to keep your account private and limit your followers to only people you know personally. Do not follow strangers and reject friend requests from strangers. They could turn out to be a hacker.
Take advantage of platform security controls that allow you to control your visible information. For example, you can disable your activity status or geolocations to block other people from tracking your every move or manage the personal data these platforms are allowed to share. Keep in mind that any third-party app with access to these platforms will have varied privacy policies. Read the fine print on their user agreements, as these policies differ depending on the app.
3. Use a VPN
Before hopping online, consider using a virtual private network (VPN) to secure your connection. A VPN allows you to browse the internet with the confidence that your Wi-Fi and any sensitive information you send through this connection is encrypted. In other words, if a hacker intercepts this data, they won’t be able to make any sense of it.
Enabling multi-factor authentication adds an extra layer of protection that makes it nearly impossible for hackers to bypass even if they do manage to steal your credentials.
Also, make sure you create strong passwords or passphrases by following password best practices and ensuring they are long, complex, and varied. Use a password manager with a generator to help you create strong passwords and store them, so you do not have to memorize them. This method also makes it easier and more secure than saving passwords on internet browsers. Further, password managers, like McAfee True Key, make it easy to securely share your credentials with others.
From social media to work to daily activities, peoples’ lives are centralized around their digital devices and online access. Users must learn to care for their information to the same degree one would manage their physical IDs or credit cards. Only then can they carry on their online activities, confident in the knowledge they are doing so securely.
The post The Ultimate Guide to Safe Sharing Online appeared first on McAfee Blogs.
Ryuk is a ransomware that encrypts a victim’s files and requests payment in Bitcoin cryptocurrency to release the keys used for encryption. Ryuk is used exclusively in targeted ransomware attacks.
Ryuk was first observed in August 2018 during a campaign that targeted several enterprises. Analysis of the initial versions of the ransomware revealed similarities and shared source code with the Hermes ransomware. Hermes ransomware is a commodity malware for sale on underground forums and has been used by multiple threat actors.
To encrypt files Ryuk utilizes a combination of symmetric AES (256-bit) encryption and asymmetric RSA (2048-bit or 4096-bit) encryption. The symmetric key is used to encrypt the file contents, while the asymmetric public key is used to encrypt the symmetric key. Upon payment of the ransom the corresponding asymmetric private key is released, allowing the encrypted files to be decrypted.
Because of the targeted nature of Ryuk infections, the initial infection vectors are tailored to the victim. Often seen initial vectors are spear-phishing emails, exploitation of compromised credentials to remote access systems and the use of previous commodity malware infections. As an example of the latter, the combination of Emotet and TrickBot, have frequently been observed in Ryuk attacks.
Ryuk is detected as Ransom-Ryuk![partial-hash].
Defenders should be on the lookout for traces and behaviours that correlate to open source pen test tools such as winPEAS, Lazagne, Bloodhound and Sharp Hound, or hacking frameworks like Cobalt Strike, Metasploit, Empire or Covenant, as well as abnormal behavior of non-malicious tools that have a dual use. These seemingly legitimate tools (e.g., ADfind, PSExec, PowerShell, etc.) can be used for things like enumeration and execution. Subsequently, be on the lookout for abnormal usage of Windows Management Instrumentation WMIC (T1047). We advise everyone to check out the following blogs on evidence indicators for a targeted ransomware attack (Part1, Part2).
When it comes to the actual ransomware binary, we strongly advise updating and upgrading endpoint protection, as well as enabling options like tamper protection and Rollback. Please read our blog on how to best configure ENS 10.7 to protect against ransomware for more details.
Ryuk ransomware is used exclusively in targeted attacks
Latest sample now targets webservers
New ransom note prompts victims to install Tor browser to facilitate contact with the actors
After file encryption, the ransomware will print 50 copies of the ransom note on the default printer
Learn more about Ryuk ransomware, including Indicators of Compromise, Mitre ATT&CK techniques and Yara Rule, by reading our detailed technical analysis.
The post New Ryuk Ransomware Sample Targets Webservers appeared first on McAfee Blogs.
Do you usually read what critics say before deciding to see a movie or read a book? We believe these McAfee MVISION XDR reviews were worth the wait. But rather than simply share a few top-tier analyst blurbs with you, we’d like to walk through what these insights mean to our growing set of customers and how their sec operations will evolve with greater efficiencies.
Extended Detection and Response products, better known as XDR, not only extended the capabilities of EDR platforms, but according to Gartner[1] “ XDR products may be able to reduce the complexity of security configuration and incident response to provide a better security outcome than isolated best-of-breed components.”
Our Enterprise Security Manager (ESM)/SecOps team briefed a top-tier analyst firm on ESM product execution and the MVISION XDR platform in particular. His reaction to our use cases? “These are great and it is useful to have examples that cut across different events, which is illustrative more so than anything. The response to the cuts across various tools, and the proactive configuration aspect with the security score type analysis, is also pretty rare in this market.”
The takeaway: Preventing an incident is much better than cleaning up after the fact. MVISION XDR powered by MVISION Insights offers a unified security posture score from endpoint to cloud, delivering a more robust and comprehensive assessment across your environment. It allows you to drill down on specifics to enhance your security.
“The vendor has stolen a march on some of its competitors, at least in the short term, with this offering. A lot of vendors are aiming to get to an offering comprising threat intel + prioritization + recommendations + automation, but few if any have actually reached that point today.” – Omdia
A top-tier analyst firm mentioned that many EDR vendors today call themselves “Open XDR” vendors, but they do not offer a fully effective XDR product. The analyst sees XDR as a significant opportunity for McAfee to expand the breadth of our product portfolio.
The takeaway: A fully effective XDR product unites security controls to detect and assess comprehensively and prevent erratic movement of advanced threats. A robust product portfolio with an integrated service offering from a platform vendor with a proven track record of integrating security (McAfee) is critical to achieve this.
Noted by a top-tier analyst firm, only McAfee and one other offers data-awareness in the XDR offering. This XDR capability alerts the analyst that the threat impact is targeted at sensitive data.
The takeaway: Many SOCs have siloed tools that hinders their ability to detect and respond quickly and appropriately. SOC’s must prioritize threat intelligence to rapidly make critical decisions.
A top-tier analyst firm believes the primary segments for XDR capabilities are in the three groups to solve problems: 1) Workspace 2) Network 3) Cloud workloads. Giving hardening guidance is good for customers, so any vulnerability exposure and threat scoring are good priorities for MVISION Insights.
The takeaway: McAfee MVISION XDR provides automation that eliminates many manual tasks but more importantly, it empowers SOC analysts to prioritize the threats that matter and stay ahead of adversaries.
A top-tier analyst firm likes our product direction. “Where you’re going with XDR, and with the cloud console — that’s the way to go. It feels like we have crossed the Rubicon of cloud-delivered.”
The takeaway: By going cloud-native, MVISION XDR enables more efficient, better, and faster decisions with automated investigations driven by correlation analysis across multiple vectors. We can provide unified visibility and control of threats across endpoints, networks and the cloud.
| To discover why McAfee MVISION XDR earns rave industry reviews, see our resources on XDR to evolve your security operations to be more efficient and effective. |
Resource: [1] Gartner Innovation Insight for Extended Detection and Response, Peter Firstbrook, Craig Lawson , 8 April 2021
The post The Industry Applauds MVISION XDR – Turning Raves into Benefits appeared first on McAfee Blogs.
Families are hitting the road again. And it’s absolutely no surprise that they’re taking their smartphones with them. Perhaps what is surprising is that so many of them may be hitting the road without any digital or mobile protection.
Our recent research shows that 68% of people in the U.S. said that they’re planning to travel for leisure this year, slightly higher than the international average of 64%.1 However, our research also discovered that nearly half of them don’t use mobile security software to protect themselves or their smartphones.
That lack of protection is a concern, particularly as our April 2021 Threats Report detected a more than 100% increase in attacks aimed at mobile devices. It makes sense that such is the case, as the pandemic led to increased adoption of online activities like banking, shopping, and even doctor visits via telemedicine—often straight from our smartphones.
However, our smartphones can be as vulnerable as any other device (like our computers). Accordingly, with the volumes of valuable data that those activities create on our smartphones, cyber crooks were sure to follow.
The good news is that you can indeed enjoy all of that mobile convenience without worry, even on vacation. No doubt many travelers will do some online banking or even some online food ordering while they’re out and about. Likewise, their kids will be online for stretches of that time too, whether it’s on chat apps like Snapchat, social media like Instagram and TikTok, games like Fortnite and Among Us, or streaming videos. Go ahead, do it all. Just make sure you’re protected before you hit the road.
With that, add mobile protection to your packing list. I’ve put together a shortlist of straightforward things you can do that will help you and your kids stay safe online while on the road this summer.
While the tips above are great for the whole family, the following additional steps are what you can take to protect your children even further:
Tracking your child’s smartphone not only allows you to find it easily if it’s lost or stolen but can also put you at ease by knowing where your child is. Yet it’s important to use location tracking selectively. Not every app needs location tracking to work as intended, even though many apps ask for permission to enable it. Go into the phone’s settings and disable the location features on an app-by-app basis. For example, a weather app doesn’t need your child’s second-by-second location information to work properly, nor should a gaming app need it at all. Likewise, photos taken on a phone can embed location information that can be easily read when shared, revealing plenty about when and where it was taken. In all, enable the location services for only the most necessary of apps like maps.
Use travel as a time to reset
Recent research shows that tweens spend nearly five hours on their screens each day, while teenagers push that up to more than seven hours a day. Some staycation time is a good time to pare back those hours and enjoy the local scenery, even if for a short stretch. You can use your travel time as well to re-establish your phone rules. That way, vacation stays entertaining but doesn’t affect the habits you set into effect back home.
Above and beyond security settings and software, there’s you. Get in the habit of talking with your child for a sense of what they’re doing online. As a mom, I like to ask them about their favorite games, share some funny TikTok clips or cute photos with them, and generally make it a point to be a part of their digital lives. It’s great, because it gives you peace of mind knowing what types of things they are doing or interactions they are having online.
For those of you hitting the road in the coming weeks, enjoy your travels, wherever they take you!
The post Travel Smart: Protecting Your Family’s Smartphones While on Vacation appeared first on McAfee Blogs.
I’m about to tell you an extraordinary fact about cybercrime. Some of the most significant data breaches in internet history weren’t after bank account numbers, cryptocurrency, or even credit card numbers. They were, in fact, after YOU. That’s right, the most valuable data on the internet is the data that comprises your identity. Let’s take a look at what that data is, how it gets leveraged by cybercriminals, and how you can get the online identity monitoring you deserve.
1 billion is a big number. In the case of a recent CVS database leak, that’s how many user records were accidentally released online, including details like email addresses and even searches about Covid vaccines. This is just one of the dozens of breaches that have occurred recently and will continue to happen as personally, identifiable information becomes more valuable to cybercriminals. Just as remarkable as the huge volume of user data being exposed online is the speed with which compromised data is used by hackers online. Cybersecurity researchers recently discovered that cybercriminals access leaked or stolen credentials within 12 hours to exploit them as soon as possible. These circumstances beg the question, why has your personally identifiable information has become so valuable lately?
While the value of some information, like a credit card number, is obvious, you may think your name and date of birth aren’t that big of a deal. After all, it wasn’t so long ago that you could find all that information in a phone book. In fact, personally identifiable information (PII), also known as data used to identify a specific individual, is what many data breaches are after.
Armed with just a mailing address, a phone number, and a date of birth, a cybercriminal can begin constructing a fake identity to take out loans and disguise many kinds of criminal activities. With a social security number and a few personal details from a social media account, they could take over a bank account. When it comes to your PII, any information is as good as gold to cybercriminals.
If our PII were treated like actual gold and held in a safe location like Fort Knox, I wouldn’t be writing this post. But in fact, it’s the currency we use to obtain many services in our connected lives. Social media sites are massive repositories of PII, and their access to our most personal details and the ability to sell it to marketers is the reason the service remains free. Free email services are the same. Now consider all the other accounts we may have created to, say, try out a streaming service for free, or even old accounts we no longer use. From that perspective, you can see how much of your data is being used by companies, may not be very well protected, and is a tempting target for cybercriminals. Fortunately, there are many things you can do to keep your identity safer online.
When it comes to protecting your PII, knowledge is power. Let’s start by identifying if you’ve been the target of a data breach. Here are a few tell-tale signs:
Okay, now that you know the signs of a data breach, let’s look at how you can take action to protect yourself. The best way to avoid being the victim of identity theft is by limiting the amount of PII you provide. There are some easy ways to do this.
Only a few types of organizations legitimately need your social security number. These include employers or when contracting with a business, group health insurance, financial and real estate transactions, applying for credit cards, car loans, and so forth.
Quizzes, social media games, and other kinds of interactive clickbait are often grifting pieces of your PII in a seemingly playful way. While you’re not giving up your SSN, you may be giving up things like your birthday, your pet’s name, your first car … things that people often use to compose their passwords or use as answers to common security questions on banking and financial sites.
A phishing email poses as a real email from known or trusted brands and financial institutions. These emails attempt to trick you into sharing important information like your logins, account numbers, credit card numbers, and so on under the guise of providing customer service. Here are some more ways to spot a phishing email.
Clearly, we’re in a new era when it comes to securing our identities online. In response, McAfee has created a new kind of identity monitoring.
We knew from the outset Identity monitoring had to be proactive, holistic, and accessible. We also wanted it to follow the timeline for how cybercrime actually affects your identity. When it comes to PII, the breach is just the first step for cybercriminals. The 10 months following a breach is when cybercriminals will use your PII to commit fraudulent acts using your data.
To address this, your identity monitoring looks after more personally identifiable information than other leading competitors. It will also alert you of stolen personal info an average of 10 months ahead of other monitoring services. And it’s accessible anywhere via mobile app, browser, and the web.
In practice, McAfee’s identity monitoring protects all your online accounts by doing the following:
As we spend more of our lives online, we need an approach to security that reflects this new reality. Identity monitoring is part of it. VPN is part of it. Antivirus is part of it. They are all pieces of a puzzle that we solve with products like McAfee Total Protection. Our premier security service is comprehensive, affordable, and, with identity monitoring, an indispensable part of your life online.
The post Identity Protection Service: The Best Solution to a Growing Problem appeared first on McAfee Blog.
Today we wrap up Mobile World Congress (MWC) 2021. Whether you joined online or attended the hybrid conference in person, one thing is certain: today’s groundbreaking technology is paving the way for our future connectivity. Fittingly, the theme of this year’s event was Connected Impact, representing the role mobile connectivity plays in an ever-changing world, where flexibility and adaptability are critical. Here are four of the key consumer takeaways from this year’s conference:
COVID-19 truly put the power of online connectivity to the test. While 2020 was supposed to be the year of 5G connectivity, this was put on pause as the world faced social and financial uncertainty. Instead, the spotlight fell on legacy technologies to create a new normal for users. Consumers quickly had to figure out how to live their best lives online — from working from home to distance learning to digitally connecting with loved ones.
To help foster online connectivity for all, 5G must step back into the spotlight. Although publicly available 5G networks have been around for two years, it is unlikely that many users see much of a difference between 5G and LTE. For users to feel the impact of 5G, mobile carriers must expand the frequencies at the low and high ends of the spectrum, which is where 5G networks operate.
Qualcomm led the 5G announcements on Monday with the unveiling of its second-generation Qualcomm 5G RAN Platform for Small Cells (FSM200xx). This platform brings major enhancements to radio frequencies and is designed to take millimeter wave performance to more places: indoors, outdoors, and around the globe. According to Qualcomm, these advancements aim to facilitate greater mobile experiences and accelerate 5G performance and availability to users everywhere— thus reshaping opportunities for homes, hospitals, offices and more.
Technology and connectivity played a crucial role in our daily lives in 2020—and therefore, unsurprisingly, spending on health and wellness tech grew by 18.1%. But now, we must ask ourselves what role technology will play post-lockdown.
While they did not have a physical appearance at MWC this year, Samsung provided a sneak of their new wearables: they introduced the One UI Watch user experience, a new interface designed to make the Galaxy Watch and smartphone experience more deeply connected. Samsung also announced its expanded partnership with Google, promising to deliver better performance, longer battery life, and a larger ecosystem of apps to the Galaxy Watch. Although they did not unveil any hardware at MWC, Samsung did ensure that users can expect to see new devices like the Galaxy Z Fold 3 and the Galaxy Watch 4 at their Galaxy Unpacked event happening in July/August of 2021.
2020 also shone a bright light on the key role technology plays in the consumption and distribution of creative arts and entertainment. Lockdown put an even greater responsibility on streaming platforms — and the devices they are accessed on — to deliver content right to people’s homes.
To help meet entertainment consumption needs, Lenovo announced not one, not two, but five new Android tablets during MWC. Its largest tablet is the Yoga Tab 13, which features a built-in kickstand, 13-inch display with 2,160 x 1,350 resolution, up to 12 hours of battery life, and more. Lenovo is pitching this model as its “portable home cinema,” perfect for streaming on the go. It also unveiled the Yoga Tab 11 and the Tab P11 Plus, which are expected to be available in EMEA in July following the Yoga Tab 13’s June release date. For users hoping for a more compact, budget-friendly device, Lenovo also announced the Lenovo Tab M8 and the Lenovo Tab M7. Whichever model you select, one thing it certain — digital devices have and will continue to be instrumental in consumer entertainment.
These exciting announcements are a great representation of what the future holds for mobile technology and greater connectivity. The advancements in mobile connectivity have already made a positive impact on consumer lifestyles, but the rise in popularity of these devices has also caught the attention of cybercriminals looking to exploit consumers’ reliance on this technology.
More time spent online interacting with various apps and services simultaneously increases your chance of exposure to cybersecurity risks and threats. Unsurprisingly, cybercriminals were quick to take advantage of the increase in connectivity throughout 2020. McAfee Labs saw an average of 375 new threats per minute and a surge of hackers exploiting the pandemic through COVID-19 themed phishing campaigns, malicious apps, malware and more. For users to continue to live a connected life, they will need to take greater care of their online safety and ensure that security is top-of-mind in any given situation. Taking these precautions will provide greater peace of mind in the new mobile-driven world.
The post The Future of Mobile: Trends from Mobile World Congress 2021 appeared first on McAfee Blogs.
ImageMagick is a hugely popular open source software that is used in lot of systems around the world. It is available for the Windows, Linux, MacOS platforms as well as Android and iOS. It is used for editing, creating or converting various digital image formats and supports various formats like PNG, JPEG, WEBP, TIFF, HEIC and PDF, among others.
Google OSS Fuzz and other threat researchers have made ImageMagick the frequent focus of fuzzing, an extremely popular technique used by security researchers to discover potential zero-day vulnerabilities in open, as well as closed source software. This research has resulted in various vulnerability discoveries that must be addressed on a regular basis by its maintainers. Despite the efforts of many to expose such vulnerabilities, recent fuzzing research from McAfee has exposed new vulnerabilities involving processing of multiple image formats, in various open source and closed source software and libraries including ImageMagick and Windows GDI+.
Fuzzing open source libraries has been covered in a detailed blog “Vulnerability Discovery in Open Source Libraries Part 1: Tools of the Trade” last year. Fuzzing ImageMagick is very well documented, so we will be quickly covering the process in this blog post and will focus on the root cause analysis of the issue we have found.
ImageMagick has lot of configuration options which we can see by running following command:
| $./configure –help |
We can customize various parameters as per our needs. To compile and install ImageMagick with AFL for our case, we can use following commands:
|
$CC=afl-gcc CXX=afl=g++ CFLAGS=”-ggdb -O0 -fsanitize=address,undefined -fno-omit-frame-pointer” LDFLAGS=”-ggdb -fsanitize=address,undefined -fno-omit-frame-pointer” ./configure
$ make -j$(nproc) $sudo make install |
This will compile and install ImageMagick with AFL instrumentation. The binary we will be fuzzing is “magick”, also known as “magick tool”. It has various options, but we will be using its image conversion feature to convert our image from one format to another.
A simple command would be include the following:
| $ magick <input file> <output file> |
This command will convert an input file to an output file format. We will be fuzzing this with AFL.
Before we start fuzzing, we need to have a good input corpus. One way of collecting corpus is to search on Google or GitHub. We can also use existing test corpus from various software. A good test corpus is available on the AFL site here: https://lcamtuf.coredump.cx/afl/demo/
Corpus collection is one thing, but we also need to minimize the corpus. The way AFL works is that it will instrument each basic block so that it can trace the program execution path. It maintains a shared memory as a bitmap and it uses an algorithm to check new block hits. If a new block hit has been found, it will save this information to bitmap.
Now it may be possible that more than one input file from the corpus can trigger the same path, as we have collected sample files from various sources, we don’t have any information on what paths they will trigger at the runtime. If we use this corpus without removing such files, then we end up wasting time and CPU cycles. We need to avoid that.
Interestingly AFL offers a utility called “afl-cmin” which we can use to minimize our test corpus. This is a recommended thing to do before you start any fuzzing campaign. We can run this as follows:
| $afl-cmin -i <input directory> -o <output directory> — magick @@ /dev/null |
This command will minimize the input corpus and will keep only those files which trigger unique paths.
After we have minimized corpus, we can start fuzzing. To fuzz we need to use following command:
| $afl-fuzz -i <mincorpus directory> -o <output directory> — magick @@ /dev/null |
This will only run a single instance of AFL utilizing a single core. In case we have multicore processors, we can run multiple instances of AFL, with one Master and n number of Slaves. Where n is the available CPU cores.
To check available CPU cores, we can use this command:
| $nproc |
This will give us the number of CPU cores (depending on the system) as follows:
In this case there are eight cores. So, we can run one Master and up to seven Slaves.
To run master instances, we can use following command:
| $afl-fuzz -M Master -i <mincorpus directory> -o <output directory> — magick @@ /dev/null |
We can run slave instances using following command:
|
$afl-fuzz -S Slave1 -i <mincorpus directory> -o <output directory> — magick @@ /dev/null
$afl-fuzz -S Slave2 -i <mincorpus directory> -o <output directory> — magick @@ /dev/null |
The same can be done for each slave. We just need to use an argument -S and can use any name like slave1, slave2, etc.
Within a few hours of beginning this Fuzzing campaign, we found one crash related to an out of bound read inside a heap memory. We have reported this issue to ImageMagick, and they were very prompt in fixing it with a patch the very next day. ImageMagick has release a new build with version: 7.0.46 to fix this issue. This issue was assigned CVE-2020-27829.
On checking the POC file, we found that it was a TIFF file.
When we open this file with ImageMagick with following command:
| $magick poc.tif /dev/null |
As a result, we see a crash like below:
As is clear from the above log, the program was trying to read 1 byte past allocated heap buffer and therefore ASAN caused this crash. This can atleast lead to a ImageMagick crash on the systems running vulnerable version of ImageMagick.
Before we start debugging this issue to find a root cause, it is necessary to understand the TIFF file format. Its specification is very well described here: http://paulbourke.net/dataformats/tiff/tiff_summary.pdf.
In short, a TIFF file has three parts:
We can tiffinfo utility from libtiff to gather various information about the POC file. This allows us to see the following information with tiffinfo like width, height, sample per pixel, row per strip etc.:
There are a few things to note here:
| TIFF Dir offset is: 0xa0
Image width is: 3 and length is: 32 Bits per sample is: 9 Sample per pixel is: 3 Rows per strip is: 1024 Planer configuration is: single image plane. We will be using this data moving forward in this post. |
As we can see in the crash log, program was crashing at function “PushQuantumPixel” in the following location in quantum-import.c line 256:
On checking “PushQuantumPixel” function in “MagickCore/quantum-import.c” we can see the following code at line #256 where program is crashing:
We can see following:
The program is crashing at this location while reading the value of “pixels” which means that value is out of bound from the allocated heap memory.
Now we need to figure out following:
To start with, we can check “ReadTIFFImage” function in coders/tiff.c file and see that it allocates memory using a “AcquireQuantumMemory” function call, which appears as per the documentation mentioned here:
https://imagemagick.org/api/memory.php:
“Returns a pointer to a block of memory at least count * quantum bytes suitably aligned for any use.
The format of the “AcquireQuantumMemory” method is:
void *AcquireQuantumMemory(const size_t count,const size_t quantum)
A description of each parameter follows:
count
the number of objects to allocate contiguously.
quantum
the size (in bytes) of each object. “
In this case two parameters passed to this function are “extent” and “sizeof(*strip_pixels)”
We can see that “extent” is calculated as following in the code below:
There is a function TIFFStripSize(tiff) which returns size for a strip of data as mentioned in libtiff documentation here:
http://www.libtiff.org/man/TIFFstrip.3t.html
In our case, it returns 224 and we can also see that in the code mentioned above, “image->columns * sizeof(uint64)” is also added to extent, which results in 24 added to extent, so extent value becomes 248.
So, this extent value of 248 and sizeof(*strip_pixels) which is 1 is passed to “AcquireQuantumMemory” function and total memory of 248 bytes get allocated.
This is how memory is allocated.
“Strip_pixel” is pointer to newly allocated memory.
Note that this is 248 bytes of newly allocated memory. Since we are using ASAN, each byte will contain “0xbe” which is default for newly allocated memory by ASAN:
https://github.com/llvm-mirror/compiler-rt/blob/master/lib/asan/asan_flags.inc
The memory start location is 0x6110000002c0 and the end location is 0x6110000003b7, which is 248 bytes total.
This memory is set to 0 by a “memset” call and this is assigned to a variable “p”, as mentioned in below image. Please also note that “p” will be used as a pointer to traverse this memory location going forward in the program:
Later on we see that there is a call to “TIFFReadEncodedPixels” which reads strip data from TIFF file and stores it into newly allocated buffer “strip_pixels” of 248 bytes (documentation here: http://www.libtiff.org/man/TIFFReadEncodedStrip.3t.html):
To understand what this TIFF file data is, we need to again refer to TIFF file structure. We can see that there is a tag called “StripOffsets” and its value is 8, which specifies the offset of strip data inside TIFF file:
We see the following when we check data at offset 8 in the TIFF file:
We see the following when we print the data in “strip_pixels” (note that it is in little endian format):
So “strip_pixels” is the actual data from the TIFF file from offset 8. This will be traversed through pointer “p”.
Inside “ReadTIFFImage” function there are two nested for loops.
Here “stride” is calculated by calling function “TIFFVStripSize()” function which as per documentation returns the number of bytes in a strip with nrows rows of data. In this case it is 14. So, every time pointer “p” is incremented by “14” or “0xE” inside the second for loop.
If we print the image structure which is passed to “ImportQuantumPixels” function as parameter, we can see following:
Here we can notice that the columns value is 3, the rows value is 32 and depth is 9. If we check in the POC TIFF file, this has been taken from ImageWidth and ImageLength and BitsPerSample value:
Ultimately, control reaches to “ImportRGBQuantum” and then to the “PushQuantumPixel” function and one of the arguments to this function is the pixels data which is pointed by “p”. Remember that this points to the memory address which was previously allocated using the “AcquireQuantumMemory” function, and that its length is 248 byte and every time value of “p” is increased by 14.
The “PushQuantumPixel” function is used to read pixel data from “p” into the internal pixel data storage of ImageMagick. There is a for loop which is responsible for reading data from the provided pixels array of 248 bytes into a structure “quantum_Info”. This loop reads data from pixels incrementally and saves it in the “quantum_info->state.pixels” field.
The root cause here is that there are no proper bounds checks and the program tries to read data beyond the allocated buffer size on the heap, while reading the strip data inside a for loop.
This causes a crash in ImageMagick as we can see below:
Therefore, to summarize, the program crashes because:
If we check at the patch diff, we can see that the following changes were made to fix this issue:
Here the 2nd argument to “AcquireQuantumMemory” is multiplied by 2 thus increasing the total amount of memory and preventing this Out of Bound read issue from heap memory. The total memory allocated is 496 bytes, 248*2=496 bytes, as we can see below:
A new version of ImageMagick 7.0.46 was released to fix this issue. While the patch fixes the memory allocation issue, if we check the code below, we can see that there was a call to memset which didn’t set the proper memory size to zero.
Memory was allocated extent*2*sizeof(*strip_pixels) but in this memset to 0 was only done for extent*sizeof(*strip_pixels). This means half of the memory was set to 0 and rest contained 0xbebebebe, which is by default for ASAN new memory allocation.
This has since been fixed in subsequent releases of ImageMagick by using extent=2*TIFFStripSize(tiff); in the following patch:
Processing various image files requires deep understanding of various file formats and thus it is possible that something may not be exactly implemented or missed. This can lead to various vulnerabilities in such image processing software. Some of this vulnerability can lead to DoS and some can lead to remote code execution affecting every installation of such popular software.
Fuzzing plays an important role in finding vulnerabilities often missed by developers and during testing. We at McAfee constantly fuzz various closed source as well as open source software to help secure them. We work very closely with various vendors and do responsible disclosure. This shows McAfee’s commitment towards securing the software and protecting our customers from various threats.
We will continue to fuzz various software and work with vendors to help mitigate risk arriving from such threats.
We would like to thank and appreciate ImageMagick team for quickly resolving this issue within 24 hours and releasing a new version to fix this issue.
The post Fuzzing ImageMagick and Digging Deeper into CVE-2020-27829 appeared first on McAfee Blogs.
Here’s to the hashtags, the likes, the followers, the DMs, and the LOLs—June 30th marks Social Media Day, a time to celebrate and reflect on how social media has changed our lives over the years.
Started in 2010 by media and entertainment company Mashable, celebrations have taken on all kinds of forms. Meetups, contests, calls to increase your social circle by one meaningful connection have all marked the date in the past. Yet this year feels like an opportunity to consider just how heavily so many of us have leaned upon social media these past months, particularly in a world where nearly 50% of the global population are social media users to some degree or other.
What’s more, people worldwide spend an average of 145 minutes a day on social media. With users in the Philippines spending three hours and 53 minutes a day and users in the U.S. spending just over two hours a day, that figure can vary widely, yet it’s safe to say that a good portion of our day features time browsing around on social media.
With that, Social Media Day is also a good day to give your social media settings and habits a closer look, all so that you can get the most out of it with less fuss and worry. Whether you’re using Facebook, Instagram, TikTok, or whatnot, here are several things you can do that can help keep you safe and secure out there:
Social media platforms like Facebook, Instagram, and others give you the option of making your profile and posts visible to friends only. Choosing this setting keeps the broader internet from seeing what you’re doing, saying, and posting, which can help protect your privacy.
Be critical of the invitations you receive. Out-and-out strangers could be more than just a stranger, they could be a fake account designed to gather information on users for purposes of cybercrime, or they can be an account designed to spread false information. There are plenty of them too. In fact, in Q1 of 2021 alone, Facebook took action on 1.3 billion fake accounts. Reject such requests.
Nothing says “there’s nobody at home right now” like that post of you on vacation or sharing your location while you’re out on the town. In effect, such posts announce your whereabouts to a broad audience of followers (even a global audience, if you’re not posting privately, as called out above). Consider sharing photos and stories of your adventures once you’ve returned.
It’s a famous saying for a reason. Whether your profile is set to private or if you are using an app with “disappearing” messages and posts (like Snapchat), what you post can indeed be saved and shared again. It’s as simple as taking a screenshot. If you don’t want it out there, forever or otherwise, simply don’t post it.
We’re increasingly accustomed to the warnings about phishing emails, yet phishing attacks happen plenty on social media. The same rules apply. Don’t follow any links you get from strangers by way of instant or direct messengers. And keep your personal information close. Don’t pass out your email, address, or other info as well. Even those so-called “quiz” posts and websites can be ruses designed to steal bits and pieces of personal info that can be used as the basis of an attack.
Some platforms such as Facebook allow users to review posts that are tagged with their profile names. Check your account settings and give yourself the highest degree of control over how and where your tags are used by others. This will help keep you aware of how you’re being mentioned by others and in what way.
Security software can protect you from clicking on malicious links while on social media, strengthen your passwords so your social media account doesn’t get hacked, and boost your online privacy as well. With identity theft a sadly commonplace occurrence today, security software is really a must.
The post Protect Your Social Media Accounts from Hacks and Attacks appeared first on McAfee Blog.
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