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Zero Day Initiative Advisory 12-141

Zero Day Initiative Advisory 12-141
Posted Aug 17, 2012
Authored by Tipping Point | Site zerodayinitiative.com

Zero Day Initiative Advisory 12-141 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of the .NET Framework. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The flaw exists within Microsoft .NET XAML Browser Application (XBAP) handling of Clipboard object data. It is possible to cause unsafe memory access within System.Windows.Forms.Clipboard, allowing an attacker to control the memory used by an object's native code. This unsafe access allows for control of a function pointer, which can be exploited to remotely execute code. In the case of Internet Explorer, execution of attacker code occurs outside of the Protected Mode sandbox.

tags | advisory, remote, arbitrary
systems | windows
advisories | CVE-2012-1855
MD5 | 115854b44c0ecde1869f05b2c8d44fc5

Zero Day Initiative Advisory 12-141

Change Mirror Download
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ZDI-12-141 : Microsoft .NET Framework Clipboard Unsafe Memory Access Remote
Code Execution Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-12-141
August 17, 2012

- -- CVE ID:
CVE-2012-1855

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

- -- Affected Vendors:
Microsoft

- -- Affected Products:
Microsoft .NET

- -- Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of the .NET Framework. User interaction is
required to exploit this vulnerability in that the target must visit a
malicious page or open a malicious file.

The flaw exists within Microsoft .NET XAML Browser Application (XBAP)
handling of Clipboard object data. It is possible to cause unsafe memory
access within System.Windows.Forms.Clipboard, allowing an attacker to
control the memory used by an object's native code. This unsafe access
allows for control of a function pointer, which can be exploited to
remotely execute code. In the case of Internet Explorer, execution of
attacker code occurs outside of the Protected Mode sandbox.

- -- 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/ms12-038

- -- Disclosure Timeline:
2012-01-12 - Vulnerability reported to vendor
2012-08-17 - Coordinated public release of advisory

- -- Credit:
This vulnerability was discovered by:
* Vitaliy Toropov

- -- 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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