Vulnerability Note VU#658620

Citrix Access Gateway LDAP authentication bypass

Original Release date: 10 Nov 2006 | Last revised: 29 Jan 2007


An error with LDAP authentication in Citrix Access Gateway appliances may allow an attacker to successfully authenticate without providing correct login credentials.


Citrix Access Gateway appliances use SSL VPN technology to give remote users secure access shared resources. These appliances can authenticate users through the LDAP protocol. Citrix includes LDAP authentication as part of the Advanced Access Control (AAC) options.

A unspecified vulnerability exists in Citrix Access Gateway Appliances that are using AAC version 4.2 with LDAP enabled. If successfully exploited, this vulnerability may allow an attacker to authenticate without supplying valid login credentials.


A remote attacker may be able to gain access to an internal network or shared resource.


Apply Hotfix
Citrix has provided a hotfix to address this issue. See Citrix Knowledge Center Document ID CTX110950 for more details.

Do not enable LDAP authentication
If another authentication method is being used, disabling LDAP authentication may mitigate the effects of this vulnerability.

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
CitrixAffected-10 Nov 2006
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



Thanks to Citrix for information about this vulnerability.

This document was written by Ryan Giobbi.

Other Information

  • CVE IDs: CVE-2006-4846
  • Date Public: 18 Sep 2006
  • Date First Published: 10 Nov 2006
  • Date Last Updated: 29 Jan 2007
  • Severity Metric: 1.15
  • Document Revision: 43


If you have feedback, comments, or additional information about this vulnerability, please send us email.