Technical Description

A vulnerability has been identified in Citrix Presentation Server and Citrix MetaFrame XP, which could be exploited by local or remote attackers to cause a denial of service or take complete control of an affected system. This issue is due to a buffer overflow error in the client print provider (CPPROV.DLL) that fails to properly handle malformed calls to the "EnumPrintersW()" and "OpenPrinter()" functions, which could be exploited by malicious local users to obtain elevated privileges via a malformed API call, or by remote unauthenticated attackers to execute arbitrary commands with SYSTEM privileges via a specially crafted RPC request.

Affected Products

Citrix Presentation Server version 4.0
Citrix MetaFrame Presentation Server version 3.0
Citrix MetaFrame XP version 1.0

Solution

Apply patches :
http://support.citrix.com/article/CTX111686

References

http://www.vupen.com/english/advisories/2007/0328
http://support.citrix.com/article/CTX111686
http://www.zerodayinitiative.com/advisories/ZDI-07-006.html

Credits

Vulnerability reported by Zero Day Initiative

ChangeLog

2007-01-24 : Initial release
2007-01-24 : Updated References

Vulnerability Management

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