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Citrix Access Gateway LDAP authentication bypass

Vulnerability Note VU#658620

Original Release Date: 2006-11-10 | Last Revised: 2007-01-29


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.

Vendor Information


Citrix Affected

Updated:  November 10, 2006



Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.


See for more details.

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Thanks to Citrix for information about this vulnerability.

This document was written by Ryan Giobbi.

Other Information

CVE IDs: CVE-2006-4846
Severity Metric: 1.15
Date Public: 2006-09-18
Date First Published: 2006-11-10
Date Last Updated: 2007-01-29 14:46 UTC
Document Revision: 43

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