Multiple Citrix products Session Reliability Service security bypass

citrix-session-security-bypass (34448) The risk level is classified as MediumMedium Risk

Description:

Multiple Citrix products could allow a remote attacker to bypass security policy restrictions, caused by an error in the Session Reliability Service. If the Session Reliability feature is enabled, a remote attacker could send a specially-crafted request and establish a TCP connection to arbitrary ports. An attacker could exploit this vulnerability to bypass security policies and gain remote access to local ports on the machine.

*CVSS:

Base Score: 4
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: Complete
  Integrity Impact: None
  Availability Impact: None
 
Temporal Score: 3
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Bypass Security

Remedy:

Refer to CTX112964 for patch or suggested workaround information. See References.

References:

  • CTX112964: Vulnerability in Citrix Presentations Server's Session Reliability service could result in network security policy bypass .
  • FORTCONSULT Security Advisory : Citrix "Session Reliability Protocol" Firewall Bypass.
  • BID-24116: Multiple Citrix Products Session Reliability Server Security Bypass Vulnerability
  • CVE-2007-2850: The Session Reliability Service (XTE) in Citrix MetaFrame Presentation Server 3.0, Presentation Server 4.0, and Access Essentials 1.0 and 1.5, allows remote attackers to bypass network security policies and connect to arbitrary TCP ports via a modified address:port string.
  • OSVDB ID: 36651: Citrix Multiple Products Session Reliability Service (XTE) Network Policy Bypass
  • SA25371: Citrix Products Session Reliability Service Security Bypass
  • SECTRACK ID: 1018098: Citrix Presentation Server Session Reliability Flaw Lets Remote Users Bypass Security Policy Restrictions

Platforms Affected:

  • Citrix Access Essentials 1.0
  • Citrix Access Essentials 1.5
  • Citrix MetaFrame Presentation Server 3.0
  • Citrix Presentation Server 4.0
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2003 Server x64

Reported:

May 16, 2007

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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