USN-782-1: Thunderbird vulnerabilities

Ubuntu Security Notice USN-782-1

25th June, 2009

thunderbird vulnerabilities

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

  • Ubuntu 9.04
  • Ubuntu 8.10
  • Ubuntu 8.04 LTS

Software description

  • thunderbird


Several flaws were discovered in the JavaScript engine of Thunderbird. If a
user had JavaScript enabled and were tricked into viewing malicious web
content, a remote attacker could cause a denial of service or possibly
execute arbitrary code with the privileges of the user invoking the
program. (CVE-2009-1303, CVE-2009-1305, CVE-2009-1392, CVE-2009-1833,

Several flaws were discovered in the way Thunderbird processed malformed
URI schemes. If a user were tricked into viewing a malicious website and
had JavaScript and plugins enabled, a remote attacker could execute
arbitrary JavaScript or steal private data. (CVE-2009-1306, CVE-2009-1307,

Cefn Hoile discovered Thunderbird did not adequately protect against
embedded third-party stylesheets. If JavaScript were enabled, an attacker
could exploit this to perform script injection attacks using XBL bindings.

Shuo Chen, Ziqing Mao, Yi-Min Wang, and Ming Zhang discovered that
Thunderbird did not properly handle error responses when connecting to a
proxy server. If a user had JavaScript enabled while using Thunderbird to
view websites and a remote attacker were able to perform a
man-in-the-middle attack, this flaw could be exploited to view sensitive
information. (CVE-2009-1836)

It was discovered that Thunderbird could be made to run scripts with
elevated privileges. If a user had JavaScript enabled while having
certain non-default add-ons installed and were tricked into viewing a
malicious website, an attacker could cause a chrome privileged object, such
as the browser sidebar, to run arbitrary code via interactions with the
attacker controlled website. (CVE-2009-1841)

Update instructions

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

Ubuntu 9.04:
Ubuntu 8.10:
Ubuntu 8.04 LTS:

To update your system, please follow these instructions:

After a standard system upgrade you need to restart Thunderbird to effect
the necessary changes.


CVE-2009-1303, CVE-2009-1305, CVE-2009-1306, CVE-2009-1307, CVE-2009-1308, CVE-2009-1309, CVE-2009-1392, CVE-2009-1833, CVE-2009-1836, CVE-2009-1838, CVE-2009-1841