Ubuntu Security Notice 6214-1 - Multiple security issues were discovered in Thunderbird. If a user were tricked into opening a specially crafted website in a browsing context, an attacker could potentially exploit these to cause a denial of service, obtain sensitive information, bypass security restrictions, cross-site tracing, or execute arbitrary code. P Umar Farooq discovered that Thunderbird did not properly provide warning when opening Diagcab files. If a user were tricked into opening a malicious Diagcab file, an attacker could execute arbitrary code.