A vulnerability has been reported in Citrix Presentation Server, which can be exploited by malicious people to compromise a vulnerable system.

The vulnerability is caused due to a boundary error in a print provider (ccprov.dll) when handling arguments passed to the "EnumPrintersW()" and "OpenPrinter()" functions. This can be exploited to e.g. cause a stack-based buffer overflow by passing an overly long string (more than 130 bytes) as the first argument to the "OpenPrinter()" function through a local API call or RPC request.

Successful exploitation allows execution of arbitrary code.

The vulnerability reportedly affects Citrix MetaFrame XP and Presentation Server version 4.0 and prior.

Solution
Apply hotfix (see vendor advisory for details).

Provided and/or discovered by
Discovered by an anonymous researcher and reported via ZDI.

Original Advisory
Citrix:
http://support.citrix.com/article/CTX111686

ZDI:
http://www.zerodayinitiative.com/advisories/ZDI-07-006.html

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