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Moderately critical

Mozilla / Firefox Three Vulnerabilities

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Release Date:  2005-02-08    Last Update:  2005-03-22    Views:  43,471

Secunia Advisory SA14160

Where:

From remote

Impact:

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

Solution Status:

Vendor Patch

CVE Reference(s):

Description


mikx has discovered three vulnerabilities in Mozilla and Firefox, which can be exploited by malicious people to plant malware on a user's system, conduct cross-site scripting attacks, disclose sensitive information, bypass certain security restrictions and compromise a user's system.

1) Mozilla and Firefox validate an image against the "Content-Type" HTTP header, but uses the file extension from the URL when saving an image after a drag and drop event. This can e.g. be exploited to plant a valid image with an arbitrary file extension and embedded script code (e.g. .bat file) on the desktop by tricking a user into performing a certain drag and drop event.

2) Missing URI handler validation when dragging a "javascript:" URL to another tab can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an arbitrary site by tricking a user into dragging a malicious link to another tab.

3) An error in the restriction of URI handlers loaded via plugins can be exploited to link to certain restricted URIs (e.g. about:config).

This can further be exploited to trick a user into changing some sensitive configuration settings.

Exploit code has been published by mikx combining vulnerability 2 and 3, where a malicious website can execute arbitrary code when a user drags the scrollbar twice.

It is also possible to read arbitrary local files via a malicious Windows SMB share hosting specially crafted javascript code.

The vulnerabilities have been confirmed in Mozilla 1.7.5 and Firefox 1.0. Other versions may also be affected.


Solution:
Mozilla:

Further details available to Secunia VIM customers

Provided and/or discovered by:
Originally discovered by:
mikx

Further information provided by:
Jelmer Kuperus

Original Advisory:
1) http://www.mikx.de/index.php?p=8
2) http://www.mikx.de/index.php?p=9
3) http://www.mikx.de/index.php?p=10

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 vuln@secunia.com

Subject: Mozilla / Firefox Three Vulnerabilities

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