Vulnerability Note VU#791496
Mozilla Firefox SVG animation nsSMILTimeContainer use-after-free vulnerability
Original Release date: 30 Nov 2016 | Last revised: 02 Dec 2016
Mozilla Firefox contains a use-after-free vulnerability in the SVG animation functionality, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.
Mozilla Firefox supports SVG animation through the use of SMIL.
The nsSMILTimeContainer object contains a use-after-free vulnerability, which can allow arbitrary code execution.
Exploit code for this vulnerability is publicly available, which specifically targets the Tor Browser Bundle.
By convincing a use to view specially-crafted web content, a remote-unauthenticated attacker may be able to execute arbitrary code on an affected system.
Apply an update
This issue is addressed in Tor Browser 6.0.7 and Mozilla Firefox versions 50.0.2 and 45.5.1 ESR, as well as Thunderbird 45.5.1.
This can be accomplished through use of the NoScript Firefox add-on.
Use the Microsoft Enhanced Mitigation Experience Toolkit
The Microsoft Enhanced Mitigation Experience Toolkit (EMET) can be used to help prevent exploitation of this and other vulnerabilities. Limited testing has shown that the following mitigations present in EMET 4.0 and later blog the public exploit for this vulnerability:
Vendor Information (Learn More)
VendorStatusDate NotifiedDate UpdatedMozillaAffected-30 Nov 2016
TorAffected-30 Nov 2016If you are a vendor and your product is affected, let
CVSS Metrics (Learn More)
This document was written by Will Dormann.
29 Nov 2016
Date First Published:
30 Nov 2016
Date Last Updated:
02 Dec 2016
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