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             AUSCERT External Security Bulletin Redistribution

        Citrix Provisioning Services streamprocess.exe Remote Code
                          Execution Vulnerability
                              21 January 2011


        AusCERT Security Bulletin Summary

Product:           Citrix Provisioning Services
Publisher:         Zero Day Initiative
Operating System:  Windows
Impact/Access:     Administrator Compromise        -- Remote/Unauthenticated
                   Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade

Original Bulletin: 

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Citrix Provisioning Services streamprocess.exe Remote Code Execution 
ZDI-11-023: January 20th, 2011

CVSS Score

      10, (AV:N/AC:L/Au:N/C:C/I:C/A:C) 

Affected Vendors


Affected Products

      Citrix Provisioning Services

TippingPoint IPS Customer Protection
TippingPoint IPS customers are protected against this vulnerability by Digital 
Vaccine protection filter ID 10781. For further product information on the 
TippingPoint IPS:


Vulnerability Details

This vulnerability allows remote attackers to execute arbitrary code on 
vulnerable installations of Citrix Provisioning Services. Authentication is not 
required to exploit this vulnerability.

The specific flaw exists within the streamprocess.exe component which listens 
by default on UDP port 6095. When handling a packet of type 0x40020010 the 
process blindly copies user supplied data into a fixed length buffer on the 
stack. A remote attacker can exploit this vulnerability to execute arbitrary 
code under the context of the SYSTEM user.

Vendor Response
Citrix has issued an update to correct this vulnerability. More details can be 
found at:


Disclosure Timeline

      2010-06-09 - Vulnerability reported to vendor
      2011-01-20 - Coordinated public release of advisory

This vulnerability was discovered by:

      AbdulAziz Hariri

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