Zero Day Initiative Advisory 11-225 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Firefox. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the nsXULCommandDispatcher.cpp source code. During a NS_XUL_COMMAND_UPDATE event dispatch, the user is able to force command dispatcher to remove all the updaters in the mUpdaters chain including the one that is currently in use. As a result, the local variable updater becomes a stale pointer and updater->mNext refers to memory previously freed. Successful exploitation can lead to code execution in the context of the browser.
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ZDI-11-225: Mozilla Firefox nsXULCommandDispatcher Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-225
June 21, 2011
-- CVE ID:
CVE-2011-0085
-- CVSS:
7.5, (AV:N/AC:L/Au:N/C:P/I:P/A:P)
-- Affected Vendors:
Mozilla
-- Affected Products:
Mozilla Firefox
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TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 11404.
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-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Firefox. User interaction is required to
exploit this vulnerability in that the target must visit a malicious
page or open a malicious file.
The specific flaw exists within the nsXULCommandDispatcher.cpp source
code. During a NS_XUL_COMMAND_UPDATE event dispatch, the user is able to
force command dispatcher to remove all the updaters in the mUpdaters
chain including the one that is currently in use. As a result, the local
variable updater becomes a stale pointer and updater->mNext refers to
memory previously freed. Successful exploitation can lead to code
execution in the context of the browser.
-- Vendor Response:
Mozilla has issued an update to correct this vulnerability. More
details can be found at:
http://www.mozilla.org/security/announce/2011/mfsa2011-23.html
-- Disclosure Timeline:
2011-04-04 - Vulnerability reported to vendor
2011-06-21 - Coordinated public release of advisory
-- Credit:
This vulnerability was discovered by:
* regenrecht
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