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Zero Day Initiative Advisory 12-137

Zero Day Initiative Advisory 12-137
Posted Aug 17, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-137 - 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.

tags | advisory, remote, arbitrary
systems | apple
advisories | CVE-2012-0651
MD5 | 6d7a2f6f3c94d43a6b332f2a7494e0e9

Zero Day Initiative Advisory 12-137

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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

- -- 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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