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Mozilla Firefox Multiple Vulnerabilities


Release Date:  2007-02-24    Last Update:  2007-03-06    Views:  50,759

Secunia Advisory SA24205


From remote


Security Bypass, Cross Site Scripting, Spoofing, Exposure of sensitive information, System access

Solution Status:

Vendor Patch

CVE Reference(s):


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

1) An error in the handling of the "locations.hostname" DOM property can be exploited to bypass certain security restrictions.

For more information:

2) An integer underflow error in the Network Security Services (NSS) code when processing SSLv2 server messages can be exploited to cause a heap-based buffer overflow via a certificate with a public key too small to encrypt the "Master Secret".

Successful exploitation may allow execution of arbitrary code.

NOTE: Support for SSLv2 is disabled in Firefox 2.x. This version is only vulnerable if user has modified hidden internal NSS settings to re-enable SSLv2 support.

3) It is possible to conduct cross-site scripting attacks against sites containing a frame with a "data:" URI as source.

Successful exploitation requires that a user is tricked into visiting a malicious website and opening a blocked popup.

4) It is possible to open windows containing local files thereby stealing the contents when the full path of a locally saved file containing malicious script code is known. This can be exploited in combination with a flaw in the seeding of the pseudo-random number generator causing downloaded files to be saved to temporary files with a somewhat predictable name.

Successful exploitation requires that a user is tricked into visiting a malicious website and opening a blocked popup.

5) Browser UI elements like the host name and security indicators can be spoofed using a specially crafted custom cursor and manipulating the CSS3 hotspot property.

6) It may be possible to gain knowledge of sensitive information from a website due to an error resulting in two web pages colliding in the disk cache thereby potentially appending part of one document to the other.

Successful exploitation requires that a user is tricked into visiting a malicious website while visiting the target website.

7) Various errors in the Mozilla parser when handling invalid trailing characters in HTML tag attribute names and during processing of UTF-7 content when child frames inherit the character set of its parent window can be exploited to conduct cross-site scripting attacks.

8) A vulnerability in the Password Manager may be exploited to conduct phishing attacks.

For more information:

9) Multiple memory corruption errors exist in the layout engine, JavaScript engine, and in SVG. Some of these may be exploited to execute arbitrary code on a user's system.

10) An error within the handling of the onUnload event handler and self-modifying document.write() calls can be exploited to corrupt memory and potentially execute arbitrary code.

11) The fix for MFSA 2006-72 introduced a regression, which can be exploited to execute arbitrary code by setting the "src" attribute of an "IMG" tag to a specially crafted javascript:URI.

Update to version or

Provided and/or discovered by:
1) Michal Zalewski
2) Discovered by regenrecht and reported via iDefense Labs.
3) shutdown
4) Michal Zalewski
5) David Eckel
6) Aad
7) RSnake and Stefan Esser.
8) Robert Chapin
9) Jesse Ruderman, Martijn Wargers, Olli Pettay, Tom Ferris, Brian Crowder, Igor Bukanov, Johnny Stenback, moz_bug_r_a4, and shutdown.
10) Michal Zalewski
11) moz_bug_r_a4 and Anbo Motohiko

Original Advisory:
Mozilla Foundation:

iDefense Labs:

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to

Subject: Mozilla Firefox Multiple Vulnerabilities

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