ZDI-10-133: Mozilla Firefox CSS font-face Remote Code Execution Vulnerability

ZDI-10-133: Mozilla Firefox CSS font-face Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-133
July 20, 2010

– CVE ID:
CVE-2010-2752

– CVSS:
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)

– Affected Vendors:
Mozilla Firefox

– Affected Products:
Mozilla Firefox 3.6.x

– TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10024.
For further product information on the TippingPoint IPS, visit:

http://www.tippingpoint.com

– Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Mozilla 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 handling of references to external font
resources. A value is used as a 16 bit integer in an array allocation
and later as 32 bit when iterating over and then populating these
fields. By creating enough references, a remote attacker can exploit
this vulnerability to execute arbitrary code under the context of the
browser.

– Vendor Response:
Mozilla Firefox has issued an update to correct this vulnerability. More
details can be found at:

http://www.mozilla.org/security/announce/2010/mfsa2010-39.html

– Disclosure Timeline:
2010-06-23 - Vulnerability reported to vendor
2010-07-20 - Coordinated public release of advisory

– Credit:
This vulnerability was discovered by:
* J23 (http://twitter.com/HansJ23)

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