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USN-297-3: Thunderbird vulnerabilities

26 July 2006

Thunderbird vulnerabilities



USN-297-1 fixed several vulnerabilities in Thunderbird for the Ubuntu
6.06 LTS release. This update provides the corresponding fixes for
Ubuntu 5.04 and Ubuntu 5.10.

For reference, these are the details of the original USN:

Jonas Sicking discovered that under some circumstances persisted XUL
attributes are associated with the wrong URL. A malicious web site
could exploit this to execute arbitrary code with the privileges of
the user. (MFSA 2006-35, CVE-2006-2775)

Paul Nickerson discovered that content-defined setters on an object
prototype were getting called by privileged UI code. It was
demonstrated that this could be exploited to run arbitrary web
script with full user privileges (MFSA 2006-37, CVE-2006-2776).

Mikolaj Habryn discovered a buffer overflow in the crypto.signText()
function. By sending an email with malicious JavaScript to an user,
and that user enabled JavaScript in Thunderbird (which is not the
default and not recommended), this could potentially be exploited to
execute arbitrary code with the user's privileges. (MFSA 2006-38,

The Mozilla developer team discovered several bugs that lead to
crashes with memory corruption. These might be exploitable by
malicious web sites to execute arbitrary code with the privileges of
the user. (MFSA 2006-32, CVE-2006-2779, CVE-2006-2780)

Masatoshi Kimura discovered a memory corruption (double-free) when
processing a large VCard with invalid base64 characters in it. By
sending a maliciously crafted set of VCards to a user, this could
potentially be exploited to execute arbitrary code with the user's
privileges. (MFSA 2006-40, CVE-2006-2781)

Masatoshi Kimura found a way to bypass web input sanitizers which
filter out JavaScript. By inserting 'Unicode Byte-order-Mark (BOM)'
characters into the HTML code (e. g. ''), these filters
might not recognize the tags anymore; however, Thunderbird would
still execute them since BOM markers are filtered out before
processing a mail containing JavaScript. (MFSA 2006-42,

Kazuho Oku discovered various ways to perform HTTP response
smuggling when used with certain proxy servers. Due to different
interpretation of nonstandard HTTP headers in Thunderbird and the
proxy server, a malicious HTML email can exploit this to send back
two responses to one request. The second response could be used to
steal login cookies or other sensitive data from another opened web
site. (MFSA 2006-33, CVE-2006-2786)

It was discovered that JavaScript run via EvalInSandbox() can escape
the sandbox. Malicious scripts received in emails containing
JavaScript could use these privileges to execute arbitrary code with
the user's privileges. (MFSA 2006-31, CVE-2006-2787)

Update instructions

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

Ubuntu 5.10
  • mozilla-thunderbird - 1.0.8-0ubuntu05.10.2
Ubuntu 5.04
  • mozilla-thunderbird - 1.0.8-0ubuntu05.04.1

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

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