[NT] Citrix Metaframe Presentation Server Print Provider Buffer Overflow Vulnerability

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Citrix Metaframe Presentation Server Print Provider Buffer Overflow
Vulnerability
------------------------------------------------------------------------


SUMMARY

A vulnerability in Citrix Metaframe Presentation Servera allows attackers
to cause a buffer overflow in the Printer Provider which in turn can be
used to execute arbitrary code.

DETAILS

Vulnerable Systems:
* Citrix Presentation Server version 4.0
* Citrix MetaFrame Presentation Server version 3.0
* Citrix MetaFrame XP version 1.0

This vulnerability allows remote attackers to execute arbitrary code on
systems with vulnerable installations of Citrix Presentation Server,
Metaframe Presentation Server or MetaFrame XP. Authentication is not
required to exploit this vulnerability.

The specific flaw exists in a print provider installed by the Presentation
Server. The cpprov.dll library doesn't properly handle certain invalid
calls to the EnumPrintersW() and OpenPrinter() functions. For example,
passing a string of 130 or more characters in the first argument to the
OpenPrinter() function results in a stack-based buffer overflow and can be
leveraged to execute code in the context of the Spooler service, which
runs as the privileged LocalSystem account.

Vendor Response:
Citrix has issued an update to correct this vulnerability. More details
can be found at: <http://support.citrix.com/article/CTX111686>
http://support.citrix.com/article/CTX111686

Disclosure Timeline:
2005.07.07 - Pre-exiting Digital Vaccine released to TippingPoint
customers
2006.10.02 - Vulnerability reported to vendor
2007.01.24 - Coordinated public release of advisory

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0444>
CVE-2007-0444


ADDITIONAL INFORMATION

The information has been provided by <mailto:zdi-disclosures@xxxxxxxx>
ZeroDay Initiative.
The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-07-006.html>
http://www.zerodayinitiative.com/advisories/ZDI-07-006.html



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