Mozilla / Firefox Three Vulnerabilities

The patch status is “The vulnerabilities have been fixed in the CVS repository” which means it hasn’t been rolled into an official release yet, but will be soon.

Secunia Advisory: SA14160
Critical: Less critical
Impact: Security Bypass, Cross Site Scripting, Manipulation of data
Where: From remote
Solution Status: Vendor Patch

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 and bypass certain security restrictions.

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.

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

The vulnerabilities have been fixed in the CVS repository.”

Full article: Secunia Advisory: SA14160