CentOS has released updated packages to address the Mozilla Firefox, Thunderbird, and SeaMonkey GIF image processing buffer overflow arbitrary code execution vulnerability.
Mozilla Firefox, Thunderbird and SeaMonkey contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system.
The vulnerability exists due to insufficient bounds checks while rendering Graphics Interchange Format (GIF) images by the affected software. An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to view a malicious GIF image file with the affected software. Successful exploitation could allow the attacker to execute arbitrary code on the targeted system.
Mozilla has confirmed the vulnerability and released software updates.
The following Mozilla products are vulnerable:
Firefox versions prior to 17.0
Firefox ESR versions prior to 10.0.11
Thunderbird versions prior to 17.0
Thunderbird ESR versions prior to 10.0.11
SeaMonkey versions prior to 2.14
To exploit the vulnerability, the attacker may provide a GIF file to the user and persuade the user to open or execute the file by using misleading language or instructions.
This vulnerability cannot be exploited through e-mail in Thunderbird and SeaMonkey because the products have scripting disabled; however, the vulnerability could be exploited in the browser-like context of the products.
Mozilla has released a security advisory at the following link: MFSA 2012-92
An unauthenticated, remote attacker could exploit the vulnerability to execute arbitrary code with elevated privileges on the targeted system. Successful attack could also allow the attacker to cause a complete system compromise.
The vulnerability exists due to insufficient bounds checks within the image::RasterImage:DrawFrameTo() function while rendering GIF image files.
An unauthenticated, remote attacker could exploit the vulnerability by convincing a targeted user to view a malicious GIF image with the affected software. Successful exploitation could cause a buffer overflow error that may corrupt memory. The attacker could leverage the memory corruption to execute arbitrary code on a targeted system.
Administrators are advised to apply the appropriate updates.
Administrators are advised to warn users not to view image files from untrusted sources.
Users are advised not to open e-mail messages from suspicious or unrecognized sources. If users cannot verify that links or attachments included in e-mail messages are safe, they are advised not to open them.
Administrators are advised to monitor affected systems.
Mozilla has released software updates at the following links:
Red Hat has released updated software for registered subscribers at the following link: Red Hat Network. Red Hat packages can be updated on Red Hat Enterprise Linux versions 5 and later using the yum tool.
Version 1, November 21, 2012, 7:50 AM: Mozilla Firefox, Thunderbird, and SeaMonkey contain a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code on a targeted system. Updates are available.
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