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

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Date: Fri, 17 Aug 2012 15:31:56 +0000
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "'full-disclosure@...ts.grok.org.uk'" <full-disclosure@...ts.grok.org.uk>, 
	"'bugtraq@...urityfocus.com'" <bugtraq@...urityfocus.com>
Cc: ZDI Disclosures <zdi-disclosures@...com>
Subject: 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

- -- 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
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TippingPoint provides its customers with zero day protection through
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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/

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