Citrix

Archive: Vulnerability in Citrix Presentation Server's Session Reliability service could result in network security policy bypass

  • CTX112964
  • Created onMay 23, 2007
  • Updated onOct 08, 2014
Security Bulletin Severity Medium

This article is no longer maintained, its content refers to a discontinued product and may be out of date. Refer to the Discontinued Product Lifecycle or Active Citrix Product pages for more information on support schedules

Description of Problem

The Session Reliability service is used by some Citrix products to improve user experience when connecting over unreliable networks. By sending a specifically crafted request to this service, an attacker could establish a TCP connection to any port on the local machine. This could be used by the attacker to bypass network security policies and remotely access local ports on the target machine.

This vulnerability is present in the following versions of Citrix products:

    • Citrix MetaFrame Presentation Server 3.0

    • Citrix Presentation Server 4.0

    • Citrix Access Essentials 1.0

    • Citrix Access Essentials 1.5

No other versions of Citrix Presentation Server, Citrix Access Essentials or Citrix Desktop Server are affected by this issue.

Customers running an affected product with the Session Reliability feature disabled are not affected by this issue.

What Customers Should Do

A hotfix has been released to address this issue. Citrix recommends that affected customers install this hotfix, which can be downloaded from the following locations:

MetaFrame Presentation Server 3.0 for Windows 2000 Server:

EN - http://support.citrix.com/article/CTX112818

FR - http://support.citrix.com/article/CTX112821

DE - http://support.citrix.com/article/CTX112819

JA - http://support.citrix.com/article/CTX112820

ES - http://support.citrix.com/article/CTX112822

MetaFrame Presentation Server 3.0 for Windows Server 2003:

EN - http://support.citrix.com/article/CTX112813

FR - http://support.citrix.com/article/CTX112816

DE - http://support.citrix.com/article/CTX112814

JA - http://support.citrix.com/article/CTX112815

ES - http://support.citrix.com/article/CTX112817

Citrix Presentation Server 4.0 for Windows 2000 Server:

EN - http://support.citrix.com/article/CTX112844

FR - http://support.citrix.com/article/CTX112847

DE - http://support.citrix.com/article/CTX112845

JA - http://support.citrix.com/article/CTX112848

ES - http://support.citrix.com/article/CTX112846

Citrix Presentation Server 4.0 for Windows Server 2003:

EN - http://support.citrix.com/article/CTX112839

FR - http://support.citrix.com/article/CTX112842

DE - http://support.citrix.com/article/CTX112840

JA - http://support.citrix.com/article/CTX112843

ES - http://support.citrix.com/article/CTX112841

Citrix Presentation Server 4.0 for Windows Server 2003 x64 Editions:

EN - http://support.citrix.com/article/CTX112886

FR - http://support.citrix.com/article/CTX112887

DE - http://support.citrix.com/article/CTX112888

JA - http://support.citrix.com/article/CTX112890

ES - http://support.citrix.com/article/CTX112889

Citrix Access Essentials 1.0:

EN - http://support.citrix.com/article/CTX112839

FR - http://support.citrix.com/article/CTX112842

DE - http://support.citrix.com/article/CTX112840

ES - http://support.citrix.com/article/CTX112841

Citrix Access Essentials 1.5:

EN - http://support.citrix.com/article/CTX112839

FR - http://support.citrix.com/article/CTX112842

DE - http://support.citrix.com/article/CTX112840

ES - http://support.citrix.com/article/CTX112841

Acknowledgements

Citrix thanks Andrew Christensen of FortConsult working with us to protect Citrix customers.

What Citrix Is Doing

Citrix is proactively notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Base at http://support.citrix.com/.

Obtaining Support on this Issue

If you require technical assistance with this issue, please contact Citrix Technical Support. Information for contacting Citrix Technical Support is available at http://support.citrix.com/.

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities very seriously. If you would like to report a security issue to Citrix, please compose an e-mail to secure@citrix.com containing the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability.

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