Some vulnerabilities have been reported in Mozilla Firefox, which can be exploited by malicious people to conduct man-in-the-middle, spoofing, and cross-site scripting attacks, and potentially compromise a user's system.

1) An error in the handling of JavaScript regular expressions containing a minimal quantifier can be exploited to cause a heap-based buffer overflow.

Successful exploitation may allow execution of arbitrary code.

2) The auto-update mechanism uses SSL to communicate securely. The problem is that users may have accepted an unverifiable self-signed certificate when visiting a web site, which will allow an attacker to redirect the update check to a malicious web site in a man-in-the-middle attack.

3) Some time-dependent errors during text display can be exploited to corrupt memory.

Successful exploitation may allow execution of arbitrary code.

This is related to:
SA21513

4) An error exists within the verification of certain signatures in the bundled Network Security Services (NSS) library.

For more information:
SA21903

5) An error in the cross-domain handling can be exploited to inject arbitrary HTML and script code in a sub-frame of another web site via a "[window].frames[index].document.open()" call.

6) An error exists due to blocked popups opened from the status bar via the "blocked popups" functionality being opened in an incorrect context in certain situations. This may be exploited to execute arbitrary HTML and script code in a user's browser session in context of an arbitrary web site.

7) Some unspecified memory corruption errors may be exploited to execute arbitrary code.

Solution
Update to version 1.5.0.7.
Further details available to Secunia VIM customers

Provided and/or discovered by
1) Priit Laes, CanadianGuy, Girts Folkmanis, and Catalin Patulea
2) Jon Oberheide
3) Jonathan Watt and Michal Zalewski
4) Philip Mackenzie and Marius Schilder, Google
5-6) shutdown
7) Bernd Mielke, Georgi Guninski, Igor Bukanov, Jesse Ruderman, Martijn Wargers, Mats Palmgren, Olli Pettay, shutdown, and Weston Carloss

Changelog
Further details available to Secunia VIM customers

Original Advisory
1) http://www.mozilla.org/security/announce/2006/mfsa2006-57.html
2) http://www.mozilla.org/security/announce/2006/mfsa2006-58.html
3) http://www.mozilla.org/security/announce/2006/mfsa2006-59.html
4) http://www.mozilla.org/security/announce/2006/mfsa2006-60.html
5) http://www.mozilla.org/security/announce/2006/mfsa2006-61.html
6) http://www.mozilla.org/security/announce/2006/mfsa2006-62.html
7) http://www.mozilla.org/security/announce/2006/mfsa2006-64.html

https://bugzilla.mozilla.org/show_bug.cgi?id=382686

http://lcamtuf.coredump.cx/ifsnatch/

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers