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TITLE:
Citrix Presentation Server Print Provider Buffer Overflow
Vulnerability

SECUNIA ADVISORY ID:
SA23869

VERIFY ADVISORY:
http://secunia.com/advisories/23869/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From local network

SOFTWARE:
Citrix Presentation Server 4.x
http://secunia.com/product/5270/
Citrix MetaFrame XP for Windows 1.x
http://secunia.com/product/178/
Citrix MetaFrame Presentation Server 3.x
http://secunia.com/product/3805/

DESCRIPTION:
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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About:
This Advisory was delivered by Secunia as a free service to help
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http://secunia.com/about_secunia_advisories/


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