__________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Citrix Presentation Server IMA Vulnerability [Security Focus 27329] January 22, 2008 20:00 GMT Number S-125 [REVISED 23 Jan 2008] ______________________________________________________________________________ PROBLEM: Citrix Presentation Server is prone to a buffer-overflow vulnerability because the IMA service fails to properly bounds-check user-supplied input before cpoying it to an insufficent sized memory buffer. PLATFORM: Citrix MetaFrame and Presentation Server 4.5 (and earlier) Citrix Access Essentials 2.0 (and earlier) Citrix Desktop Server 1.0 (and earlier) DAMAGE: Execution of arbitrary code. SOLUTION: Upgrade to the appropriate version. ______________________________________________________________________________ VULNERABILITY The risk is HIGH. Successfully exploiting this issue may ASSESSMENT: allow attackers to execute arbitrary machine code in the context of the IMA server process. The userid context that is compromised is SYSTEM. A remote, unathenticated, attacker could cause root-level compromise.Failed exploit attempts will likely result in denial-of-service conditions. ______________________________________________________________________________ LINKS: CIAC BULLETIN: http://www.ciac.org/ciac/bulletins/s-125.shtml ORIGINAL BULLETIN: http://www.securityfocus.com/bid/27329/discuss ______________________________________________________________________________ REVISION HISTORY: 01/23/2008 - revised S-125 to change the Vulnerability Assessment from MEDIUM to HIGH. The userid context that is compromised is SYSTEM. A remote, unathenticated, attacker could cause root-level compromise. [***** Start Security Focus 27329 *****] Citrix Presentation Server IMA Service Buffer Overflow Vulnerability Citrix Presentation Server is prone to a buffer-overflow vulnerability because the IMA service fails to properly bounds-check user-supplied input before copying it to an insufficiently sized memory buffer. Successfully exploiting this issue may allow attackers to execute arbitrary machine code in the context of the IMA server process. Failed exploit attempts will likely result in denial-of-service conditions. The issue affects the following versions: Citrix MetaFrame and Presentation Server 4.5 (and earlier) Citrix Access Essentials 2.0 (and earlier) Citrix Desktop Server 1.0 (and earlier) Bugtraq ID: 27329 Class: Boundary Condition Error CVE: Remote: Yes Local: No Published: Jan 15 2008 12:00AM Updated: Jan 18 2008 05:08PM Credit: TippingPoint and the ZDI are credited with the discovery of this issue. Vulnerable: Citrix Presentation Server 4.0 Citrix Presentation Server 4.5 Citrix MetaFrame Presentation Server 3.0 Citrix Desktop Server 1.0 x64 Citrix Desktop Server 1.0 Citrix Access Essentials 2.0 Citrix Access Essentials 1.5 Citrix Access Essentials 1.0 [***** End Security Focus 27329 *****] _______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Security Focus for the information contained in this bulletin. _______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. 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A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. 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