Mozilla Firefox SVG animation nsSMILTimeContainer use-after-free vulnerability

Overview

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.

Description

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.

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Impact

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.

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Solution

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.

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Disable JavaScript

This vulnerability can be mitigated by disabling JavaScript. 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:

* StackPivot
* EAF
* Caller  

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Vendor Information

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Mozilla Affected

Updated: November 30, 2016

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

• <https://www.mozilla.org/en-US/security/advisories/mfsa2016-92/&gt;

Tor Affected

Updated: November 30, 2016

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Vendor References

• <https://blog.torproject.org/blog/tor-browser-607-released&gt;

CVSS Metrics

Group	Score	Vector
Base	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P
Temporal	6.5	E:H/RL:OF/RC:C
Environmental	6.5	CDP:ND/TD:H/CR:ND/IR:ND/AR:ND

References

• <https://www.mozilla.org/en-US/security/advisories/mfsa2016-92/&gt;
• <https://hg.mozilla.org/mozilla-central/rev/adcc39e3cad0&gt;
• <https://bugzilla.mozilla.org/show_bug.cgi?id=1321066&gt;
• <https://blog.gdatasoftware.com/2016/11/29346-firefox-0-day-targeting-tor-users&gt;
• <http://support.microsoft.com/kb/2458544&gt;

Acknowledgements

This document was written by Will Dormann.

Other Information

CVE IDs:	CVE-2016-9079
Date Public:	2016-11-29 Date First Published: