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Zero Day Initiative Advisory 12-185

Zero Day Initiative Advisory 12-185
Posted Nov 16, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-185 - 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 DirectoryService daemon. This process listens on TCP port 625 by default on Mac OSX Server pre 10.7. Request types to the service include a sComProxyData structure having a translate field which is responsible for describing the endianness of the payload. When passing a message to SwapProxyMessage for byte-reordering, multiple user controlled fields are trusted including lengths and offsets. When processing this data with DSSwapObjectData, the process will address memory out of the bounds of the allocated region. A remote attacker can exploit this vulnerability to execute arbitrary code under the context of the process.

tags | advisory, remote, arbitrary, tcp
systems | apple
advisories | CVE-2012-0650
MD5 | 299a5e0dc5be8e1d0645a0bec6dafd01

Zero Day Initiative Advisory 12-185

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ZDI-12-185 : Apple Mac OS X DirectoryService SwapProxyMessage Unchecked
objOffset Remote Code Execution Vulnerability

http://www.zerodayinitiative.com/advisories/ZDI-12-185

November 15, 2012

- -- CVE ID:
CVE-2012-0650

- -- 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 DirectoryService daemon. This process listens on
TCP port 625 by default on Mac OSX Server pre 10.7. Request types to the
service include a sComProxyData structure having a translate field which is
responsible for describing the endianness of the payload. When passing a
message to SwapProxyMessage for byte-reordering, multiple user controlled
fields are trusted including lengths and offsets. When processing this data
with DSSwapObjectData, the process will address memory out of the bounds of
the allocated region. 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
2012-11-15 - 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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