Multiple vulnerabilities were fixed in Thunderbird.
Benjamin Smedberg, Bob Clary, Jesse Ruderman, and Josh Aas discovered multiple memory vulnerabilities in the Gecko rendering engine. An attacker could use these to possibly execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2011-2995, CVE-2011-2996)
28 September 2011
A security issue affects these releases of Ubuntu and its derivatives:
Multiple vulnerabilities were fixed in Thunderbird.
Benjamin Smedberg, Bob Clary, Jesse Ruderman, and Josh Aas discovered multiple memory vulnerabilities in the Gecko rendering engine. An attacker could use these to possibly execute arbitrary code with the privileges of the user invoking Thunderbird. (CVE-2011-2995, CVE-2011-2996)
Boris Zbarsky discovered that a frame named “location” could shadow the window.location object unless a script in a page grabbed a reference to the true object before the frame was created. This is in violation of the Same Origin Policy. A malicious E-Mail could possibly use this to access the local file system. (CVE-2011-2999)
Mark Kaplan discovered an integer underflow in the SpiderMonkey JavaScript engine. An attacker could potentially use this to crash Thunderbird.
Ian Graham discovered that when multiple Location headers were present, Thunderbird would use the second one resulting in a possible CRLF injection attack. CRLF injection issues can result in a wide variety of attacks, such as XSS (Cross-Site Scripting) vulnerabilities, browser cache poisoning, and cookie theft. (CVE-2011-3000)
Mariusz Mlynski discovered that if the user could be convinced to hold down the enter key, a malicious website or E-Mail could potential pop up a download dialog and the default open action would be selected. This would result in potentially malicious content being run with privileges of the user invoking Thunderbird. (CVE-2011-2372)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart Thunderbird to make all the necessary changes.
Vulmon