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TUCoPS :: Apple(multi) :: bx6148.htm

Apple Preview libFontParser SpecialEncoding Remote Code Execution Vulnerability



ZDI-10-076: Apple Preview libFontParser SpecialEncoding Remote Code Execution Vulnerability
ZDI-10-076: Apple Preview libFontParser SpecialEncoding Remote Code Execution Vulnerability



ZDI-10-076: Apple Preview libFontParser SpecialEncoding Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-076 
April 14, 2010

-- CVE ID:
CVE-2010-1120

-- Affected Vendors:
Apple

-- Affected Products:
Apple Preview

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9686. 
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 Preview. User interaction is required
in that a target must open a malicious file or visit a malicious page.

The specific flaw exists within the routine
TType1ParsingContext::SpecialEncoding() defined in libFontParser.dylib.
While parsing glyphs from a PDF document, a malformed offset greater
than 0x400 can result in a heap corruption which can be leveraged by an
attacker to execute arbitrary code under the context of the current
user.

-- Vendor Response:
Apple has issued an update to correct this vulnerability. More
details can be found at:

http://support.apple.com/kb/HT4131 

-- Disclosure Timeline:
2010-03-26 - Vulnerability reported to vendor
2010-04-14 - Coordinated public release of advisory

-- Credit:
This vulnerability was discovered by:
    * Charlie Miller

-- 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:

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