ZDI-12-137 : Apple Mac OS X libsecurity_cdsa_plugin Malloc Integer Truncation Remote Code Execution Vulnerability

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ZDI-12-137 : Apple Mac OS X libsecurity_cdsa_plugin Malloc Integer
Truncation Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-137
August 17, 2012

• – CVE ID:
  CVE-2012-0651

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

• – Affected Vendors:
  Apple

• – Affected Products:
  Apple OS X

• – Vulnerability Details:
  This vulnerability allows remote attackers to execute arbitrary code on
  vulnerable installations of Apple Mac OSX. Authentication is not required
  to exploit this vulnerability.

The flaw exists within the libsecurity_cdsa_plugin which implements
routines defined in libsecurity_cssm. The library defines an allocation
routine as having an argument type uint32. The implemented methods in the
cdsa_plugin accept parameter having type size_t, this value is truncated
from 64 bits to 32 bits when being passed to the library routine. This can
lead to an underallocated memory region and ultimately a write out of
bounds. A remote attacker can exploit this vulnerability to execute
arbitrary code under the context of the process.

• – Vendor Response:
  Apple has issued an update to correct this vulnerability. More details can
  be found at:
  http://support.apple.com/kb/HT1222

• – Disclosure Timeline:
  2011-11-29 - Vulnerability reported to vendor
  2012-08-17 - Coordinated public release of advisory

• – Credit:
  This vulnerability was discovered by:

• aazubel

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