USN-1213-1: Thunderbird vulnerabilities

Ubuntu Security Notice USN-1213-1

28th September, 2011

thunderbird vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 11.04
  • Ubuntu 10.10
  • Ubuntu 10.04 LTS


Multiple vulnerabilities were fixed in Thunderbird.

Software description

  • thunderbird - Mozilla Open Source mail and newsgroup client


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)

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 11.04:
thunderbird 3.1.15+build1+nobinonly-0ubuntu0.11.04.1
Ubuntu 10.10:
thunderbird 3.1.15+build1+nobinonly-0ubuntu0.10.10.1
Ubuntu 10.04 LTS:
thunderbird 3.1.15+build1+nobinonly-0ubuntu0.10.04.1

To update your system, please follow these instructions:

After a standard system update you need to restart Thunderbird to make
all the necessary changes.


CVE-2011-2372, CVE-2011-2995, CVE-2011-2996, CVE-2011-2999, CVE-2011-3000