Multiple Mozilla products contain a flaw that may lead to an unauthorized information disclosure. The issue is triggered when an error occurs in the mImageBufferSize() method during the encoding of an image as image/vnd.microsoft.icon. This will cause an image to be initialized with a different value than that of the source image, which may allow an attacker to gain access to potentially sensitive information when converting an image from ICO format to PNG.
Remote / Network Access,
Loss of Confidentiality
Upgrade Firefox and Thunderbird to version 10.0 or higher, and SeaMonkey to version 2.7 or higher, as they have been reported to fix this vulnerability. An upgrade is required as there are no known workarounds.
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