CSS cursor image buffer overflow (Windows only)

CSS cursor image buffer overflow (Windows only)

Announced

December 19, 2006

Reporter

Frederik Reiss

Impact

Critical

Products

Firefox, SeaMonkey, Thunderbird

Fixed in

• Firefox 1.5.0.9
• Firefox 2.0.0.1
• SeaMonkey 1.0.7
• Thunderbird 1.5.0.9

Description

Frederik Reiss reported a crash when using the CSS cursor property to set the cursor to certain images on Windows. A miscalculated size during conversion of the image to a Windows bitmap can result in a heap buffer overflow which could be used to compromise the victim's computer.

This flaw affects both Firefox 2 and Firefox 1.5 but not the earlier Firefox 1.0 or Mozilla Suite

Workaround

Upgrade to a fixed version.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=353553
• CVE-2006-6500