A Zoom Screen-Sharing Bug Let Anyone Take Over Other Devices on a Call
While working through a kernel exploit chain on Windows 11, I noticed that a stack pivot into user-mode memory didn't trigger SMAP.
I wrote up three experiments to figure out why. Short version: the normal syscall entry path arrives with RFLAGS.AC=1. SMAP is effectively disabled for any code reached through a standard IOCTL dispatch. This aligns with what MSRC documented back in 2020 (the Windows kernel simply wasn't built with SMAP in mind, and retrofitting it would touch ~2,900 locations: here)
My conclusion isn't novel here. It's just an experimental confirmation of the architectural compromise on current builds. I just wanted to shine the light on this blind spot.
Hunt.io researchers analyzed two open directories recovered through Attack Capture system and reconstructed the tooling one operator used to find, exploit, and view internet-exposed cameras in Ukraine.
Technical highlights:
No state attribution. Full analysis, IOCs, and ATT&CK mapping in the writeup