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Zero Day Initiative Advisory 11-099

Zero Day Initiative Advisory 11-099
Posted Mar 3, 2011
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 11-099 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Apple Safari's Webkit. 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 the application handles floating blocks in certain situations. When performing layout operations for a floating block produced by a pseudo-element, the application will attempt to access glyph data that hasn't been fully assigned into the glyph data hashmap. Due to this type being incomplete, this can lead to code execution under the context of the application.

tags | advisory, remote, arbitrary, code execution
systems | apple
advisories | CVE-2011-0133
SHA-256 | 0bc533335809df4a9517760a808b2d7ea9a75bb5c2e383c1786a4c266efe8f50

Zero Day Initiative Advisory 11-099

Change Mirror Download
ZDI-11-099: Apple Webkit Font Glyph Layout Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-11-099

March 2, 2011

-- CVE ID:
CVE-2011-0133

-- CVSS:
9.7, (AV:N/AC:L/Au:N/C:C/I:P/A:C)

-- Affected Vendors:
Apple

-- Affected Products:
Apple WebKit

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 10870.
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 Apple Safari's Webkit. 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 the application handles floating
blocks in certain situations. When performing layout operations for a
floating block produced by a pseudo-element, the application will
attempt to access glyph data that hasn't been fully assigned into the
glyph data hashmap. Due to this type being incomplete, this can lead to
code execution under the context of the application.

-- Vendor Response:
Apple has issued an update to correct this vulnerability. More
details can be found at:
http://support.apple.com/kb/HT4554

-- Disclosure Timeline:
2010-10-18 - Vulnerability reported to vendor
2011-03-02 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
* wushi of team509

-- 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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