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AUSCERT External Security Bulletin Redistribution
ESB-2011.0072
Citrix Provisioning Services streamprocess.exe Remote Code
Execution Vulnerability
21 January 2011
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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:
http://www.zerodayinitiative.com/advisories/ZDI-11-023/
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Citrix Provisioning Services streamprocess.exe Remote Code Execution
Vulnerability
ZDI-11-023: January 20th, 2011
CVSS Score
10, (AV:N/AC:L/Au:N/C:C/I:C/A:C)
Affected Vendors
Citrix
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:
http://www.tippingpoint.com
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:
http://support.citrix.com/article/CTX127149
Disclosure Timeline
2010-06-09 - Vulnerability reported to vendor
2011-01-20 - Coordinated public release of advisory
Credit
This vulnerability was discovered by:
AbdulAziz Hariri
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