[NT] Citrix Presentation Server IMA Service Heap Overflow Vulnerability



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Citrix Presentation Server IMA Service Heap Overflow Vulnerability
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SUMMARY

A vulnerability allows attackers to execute arbitrary code on vulnerable
installations of Citrix Presentation Server. Authentication is not
required to exploit this vulnerability.

DETAILS

Vulnerable Systems:
* Metaframe Presentation Server version 3.0
* Presentation Server version 4.0, version 4.5
* Access Essentials version 1.0, version 1.5, version 2.0
* Desktop Server version 1.0

The specific flaw resides in the Independent Management Architecture
service, ImaSrv.exe, which listens by default on TCP port 2512 or 2513.
The process trusts a user-suppled value as a parameter to a memory
allocation. By supplying a specific value, an undersized heap buffer may
be allocated. Subsequently, an attacker can then overflow that heap buffer
by sending an overly large packet leading to arbitrary code execution in
the context of the SYSTEM user.

Vendor Response:
Citrix has issued an update to correct this vulnerability. More details
can be found at: <http://support.citrix.com/article/CTX114487>
http://support.citrix.com/article/CTX114487

Disclosure Timeline:
2007.07.20 - Vulnerability reported to vendor
2008.01.17 - Coordinated public release of advisory


ADDITIONAL INFORMATION

The information has been provided by <mailto:zdi-disclosures@xxxxxxxx>
The Zero Day Initiative (ZDI).
The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-08-002.html>
http://www.zerodayinitiative.com/advisories/ZDI-08-002.html



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