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Zero Day Initiative Advisory 12-044

Zero Day Initiative Advisory 12-044
Posted Mar 16, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-044 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Microsoft's Remote Desktop Protocol. Authentication is not required to exploit this vulnerability. The specific flaw exists during handling of an error while loading elements into an array. This condition can cause the driver to abort a connection and part of the logic of the abort is to free an object associated with it. This will actually occur twice when each of channels are disconnected. The second time this object is freed, the driver will fetch a virtual pointer from the freed object and call it. This can lead to code execution under the context of the driver.

tags | advisory, remote, arbitrary, code execution, protocol
advisories | CVE-2012-0002
SHA-256 | 10864a15ca77b98406254b2f35007bb2b449eabd2c3ebff0d116a3416159f77e

Zero Day Initiative Advisory 12-044

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ZDI-12-044 : Microsoft Remote Desktop Protocol Channel Abort Condition
Remote Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-044
March 15, 2012

- -- CVE ID:
CVE-2012-0002

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

- -- Affected Vendors:

Microsoft



- -- Affected Products:

Microsoft Remote Desktop



- -- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 12138.
For further product information on the TippingPoint IPS, visit:

http://www.tippingpoint.com

- -- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Microsoft's Remote Desktop Protocol.
Authentication is not required to exploit this vulnerability.

The specific flaw exists during handling of an error while loading
elements into an array. This condition can cause the driver to abort a
connection and part of the logic of the abort is to free an object
associated with it. This will actually occur twice when each of channels
are disconnected. The second time this object is freed, the driver will
fetch a virtual pointer from the freed object and call it. This can lead
to code execution under the context of the driver.

- -- Vendor Response:

Microsoft has issued an update to correct this vulnerability. More
details can be found at:

http://technet.microsoft.com/en-us/security/bulletin/ms12-020




- -- Disclosure Timeline:
2011-08-24 - Vulnerability reported to vendor

2012-03-15 - Coordinated public release of advisory



- -- Credit:
This vulnerability was discovered by:

* Luigi Auriemma



- -- 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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