Multiple vulnerabilities have been reported in Mozilla Firefox and Thunderbird, which can be exploited by malicious people to bypass certain security restrictions, disclose certain sensitive information, and compromise a vulnerable system.

1) Some unspecified errors can be exploited to corrupt memory. No further information is currently available.

2) An error exists within the "SVGTextElement.getCharNumAtPosition()" function.

For more information see vulnerability #5 in:
SA45581

3) An error within the event management code can be exploited to execute arbitrary JavaScript with chrome privileges.

4) A use-after-free error within the handling of the ".appendChild()" method when importing certain objects can be exploited to can be exploited to dereference an invalid pointer.

5) An error when dropping a tab element in content areas can be exploited to execute arbitrary code with chrome privileges.

6) The "ThinkPadSensor::Startup()" function loads libraries in an insecure manner and can be exploited to load arbitrary libraries by tricking a user into opening a specially crafted file located on a remote WebDAV or SMB share.

7) An error when handling the "RegExp.input()" function can be exploited to read data from other domains.

The vulnerabilities are reported in the following products:
* Mozilla Firefox versions prior to 3.6.20
* Mozilla Thunderbird versions prior to 3.1.12.

Solution
Update to Firefox version 3.6.20 or Thunderbird version 3.1.12.

Provided and/or discovered by
2, 4) regenrecht via ZDI
6) Mitja Kolsek, ACROS Security

The vendor credits:
1) Gary Kwong, Igor Bukanov, Nils, and Bob Clary
3, 5) moz_bug_r_a_4
7) shutdown

Changelog
Further details available to Secunia VIM customers

Original Advisory
Mozilla (MFSA 2011-30, MFSA 2011-32):
http://www.mozilla.org/security/announce/2011/mfsa2011-30.html
http://www.mozilla.org/security/announce/2011/mfsa2011-32.html

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-11-270/
http://www.zerodayinitiative.com/advisories/ZDI-11-271/

ACROS Security:
http://www.acrossecurity.com/aspr/ASPR-2011-08-18-1-PUB.txt
http://www.acrossecurity.com/aspr/ASPR-2011-08-18-2-PUB.txt

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers