Apple Preview libFontParser SpecialEncoding Remote Code Execution Vulnerability

April 14th, 2010
ZDI-10-076 ZDI-CAN-760

CVE ID

CVE-2010-1120

CVSS Score

10.0 AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected Vendors

Apple

Affected Products

Preview

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.

Additional Details

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

Charlie Miller

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