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Vigil@nce - Opera: buffer overflow via GIF images

December 2012 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can create a specially ill formed GIF image and invite
an user to view it with Opera, in order to make the user’s host
execute code.

Impacted products: Opera

Severity: 2/4

Creation date: 06/12/2012

Revision date: 18/12/2012

DESCRIPTION OF THE VULNERABILITY

Opera supports GIF images.

To decode and then display an image, Opera allocates a buffer the
size of which is provided by the GIF file. However, with some
inconsistent files, the needed buffer size is wrongly computed.
So, the image loading leads to a buffer overflow.

An attacker can therefore create a specially ill formed GIF image
and invite an user to view it with Opera, in order to make the
user’s host execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Opera-buffer-overflow-via-GIF-images-12213


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