Multiple vulnerabilities have been reported in Mozilla Firefox and Thunderbird, which can be exploited by malicious people to conduct cross-site scripting and spoofing attacks, disclose certain system and sensitive information, bypass certain security restrictions, and compromise a user's system.

1) Multiple unspecified errors can be exploited to corrupt memory.

2) A use-after-free error exists within the XPConnect hashtable when handling IDBKeyRange indexedDB.

3) An error within the gfxImageSurface class when handling certain graphic values can be exploited to cause a heap-based buffer overflow.

4) An error when handling multi-octet encoding can be exploited to conduct cross-site scripting attacks.

5) An error within the "cairo_dwrite_font_face()" function when rendering fonts can be exploited to corrupt memory.

6) An error within the "WebGL.drawElements()" function when handling certain template arguments can be exploited to disclose contents of arbitrary video memory.

7) An error within docshell when loading pages can be exploited to display arbitrary content while showing the URL of a trusted web site in the address bar and e.g. conduct cross-site scripting attacks.

8) An error within the handling of XMLHttpRequest and WebSocket while using an IPv6 address can be exploited to bypass the same-origin policy.

9) An error when decoding ISO-2022-KR and ISO-2022-CN character sets can be exploited to conduct cross-site scripting attacks.

10) An error exists within the "texImage2D()" function within WebGL when using JSVAL_TO_OBJECT.

11) An off-by-one error exists within the OpenType sanitizer when parsing certain data.

12) An error within the handling of javascript errors can be exploited to disclose the file names and location of javascript files on a server.

13) An error when handling RSS and Atom XML content loaded over HTTPS can be exploited to display arbitrary content while showing the URL of a trusted web site in the address bar.

Successful exploitation of vulnerabilities #1, #2, #3, #5, #10, and #11 may allow execution of arbitrary code.

Solution
Upgrade to Firefox version 12.0 and Thunderbird version 12.0

Provided and/or discovered by
The vendor credits:
1) Christian Holler, Bob Clary, Christian Holler, Brian Hackett, Bobby Holley, Gary Kwong, Hilary Hall, Honza Bambas, Jesse Ruderman, Julian Seward, and Olli Pettay
2) Aki Helin, OUSPG
3) Atte Kettunen, OUSPG
4) Anne van Kesteren, Opera Software
5) wushi, team509 via iDefense
6) Matias Juntunen
7) Jordi Chancel, Eddy Bordi, and Chris McGowen
8) Simone Fabiano
9) Masato Kinugawa
10) Ms2ger
11) Mateusz Jurczyk, Google Security Team
12) Daniel Divricean
13) Jeroen van der Gun

Original Advisory
http://www.mozilla.org/security/announce/2012/mfsa2012-20.html
http://www.mozilla.org/security/announce/2012/mfsa2012-22.html
http://www.mozilla.org/security/announce/2012/mfsa2012-23.html
http://www.mozilla.org/security/announce/2012/mfsa2012-24.html
http://www.mozilla.org/security/announce/2012/mfsa2012-25.html
http://www.mozilla.org/security/announce/2012/mfsa2012-26.html
http://www.mozilla.org/security/announce/2012/mfsa2012-27.html
http://www.mozilla.org/security/announce/2012/mfsa2012-28.html
http://www.mozilla.org/security/announce/2012/mfsa2012-29.html
http://www.mozilla.org/security/announce/2012/mfsa2012-30.html
http://www.mozilla.org/security/announce/2012/mfsa2012-31.html
http://www.mozilla.org/security/announce/2012/mfsa2012-32.html
http://www.mozilla.org/security/announce/2012/mfsa2012-33.html

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