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Zero Day Initiative Advisory 11-310

Zero Day Initiative Advisory 11-310
Posted Oct 26, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-310 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Adobe Reader. 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 way Adobe Reader handles compound glyphs. When a glyph has more then 0x7FFF 'numberOfContours' a sign extension occurs resulting in a buffer under-read. Simple glyphs are checked when Adobe Reader parses the font info, but the value for 'numberOfContours' in an compound glyph is the sum of all its child glyphs, and this is not checked. This could result in remote code execution under the context of the current user.

tags | advisory, remote, arbitrary, code execution
advisories | CVE-2011-2441
MD5 | eb398311af2ba3b32f107e10765edd8c

Zero Day Initiative Advisory 11-310

Change Mirror Download
ZDI-11-310 : Adobe Reader Compound Glyph Index Sign Extension Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-11-310
October 26, 2011

-- CVE ID:
CVE-2011-2441

-- CVSS:
7.5, AV:N/AC:L/Au:N/C:P/I:P/A:P

-- Affected Vendors:

Adobe



-- Affected Products:

Adobe Reader



-- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Adobe Reader. 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 way Adobe Reader handles compound
glyphs. When a glyph has more then 0x7FFF 'numberOfContours' a sign
extension occurs resulting in a buffer under-read. Simple glyphs are
checked when Adobe Reader parses the font info, but the value for
'numberOfContours' in an compound glyph is the sum of all its child
glyphs, and this is not checked. This could result in remote code
execution under the context of the current user.

-- Vendor Response:

Adobe has issued an update to correct this vulnerability. More details
can be found at:

http://www.adobe.com/support/security/bulletins/apsb11-24.html



-- Disclosure Timeline:
2011-07-20 - Vulnerability reported to vendor
2011-10-26 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:

* binaryproof



-- About the Zero Day Initiative (ZDI):
Established by TippingPoint, The Zero Day Initiative (ZDI) represents
a best-of-breed model for rewarding security researchers for responsibly
disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research
through the ZDI can find more information and sign-up at:

http://www.zerodayinitiative.com

The ZDI is unique in how the acquired vulnerability information is
used. TippingPoint does not re-sell the vulnerability details or any
exploit code. Instead, upon notifying the affected product vendor,
TippingPoint provides its customers with zero day protection through
its intrusion prevention technology. Explicit details regarding the
specifics of the vulnerability are not exposed to any parties until
an official vendor patch is publicly available. Furthermore, with the
altruistic aim of helping to secure a broader user base, TippingPoint
provides this vulnerability information confidentially to security
vendors (including competitors) who have a vulnerability protection or
mitigation product.

Our vulnerability disclosure policy is available online at:

http://www.zerodayinitiative.com/advisories/disclosure_policy/

Follow the ZDI on Twitter:

http://twitter.com/thezdi

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