VigilantMinds Advisory: Opera JPEG Processing Integer Overflow Vulnerability (VMSA-20060621-01)

["VigilantMinds Advisories" <advisories () vigilantminds com>]

Opera JPEG Processing Integer Overflow Vulnerability (VMSA-20060621-01)

Summary:
An integer overflow vulnerability exists in the Opera Web Browser due to
the improper handling of JPEG files.

Impact:
Remote Code Execution

Affected Versions:
Opera 8.54 and Earlier

Details:
If excessively large height and width values are specified in certain
fields of a JPEG file, an integer overflow may cause Opera to allocate
insufficient memory for the image.  This will lead to a buffer overflow
when the image is loaded into memory, which can be exploited to execute
arbitrary code.

Recommended Actions:
It is recommended that users upgrade to Opera 9.00, which addresses this
vulnerability.  Additionally, users should exercise caution while
accessing the web, and should do so from accounts with limited
privileges.

Timeline:
Reported: 4/25/2006
Fixed: 6/20/2006

Credit:
Chris Ries

References:
Opera Website: http://www.opera.com
VigilantMinds Website: http://www.vigilantminds.com