USN-200-1: Thunderbird vulnerabilities

11 October 2005

Thunderbird vulnerabilities



A buffer overflow was discovered in the XBM image handler. By tricking
an user into opening a specially crafted XBM image, an attacker could
exploit this to execute arbitrary code with the user's privileges.

Mats Palmgren discovered a buffer overflow in the Unicode string
parser. Unicode strings that contained "zero-width non-joiner"
characters caused a browser crash, which could possibly even exploited
to execute arbitrary code with the user's privileges.

Georgi Guninski reported an integer overflow in the JavaScript engine.
This could be exploited to run arbitrary code under some conditions.

Peter Zelezny discovered that URLs which are passed to Thunderbird on the
command line are not correctly protected against interpretation by the shell.
If Thunderbird is configured as the default handler for "mailto:" URLs, this
could be exploited to execute arbitrary code with user privileges by tricking
the user into clicking on a specially crafted URL (for example, in an email or
chat client). (CAN-2005-2968)

This update also fixes some less critical issues which are described
(CAN-2005-2703, CAN-2005-2704, CAN-2005-2706, CAN-2005-2707)

The "enigmail" plugin has been updated to work with the new
Thunderbird and Mozilla versions.

Update instructions

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

Ubuntu 5.04
  • mozilla-thunderbird -
Ubuntu 4.10
  • mozilla-thunderbird -

In general, a standard system update will make all the necessary changes.

Related notices

  • USN-186-1: mozilla-browser, mozilla-mailnews, mozilla-firefox, mozilla-calendar