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Vulnerability Note VU#658620

Citrix Access Gateway LDAP authentication bypass

Overview

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

I. Description

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.

II. Impact

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

III. Solution

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

VendorStatusDate NotifiedDate Updated
CitrixVulnerable10-Nov-2006

References


http://support.citrix.com/article/CTX110950
http://www.citrix.com/English/ps2/products/product.asp?contentID=15005
http://secunia.com/advisories/21941/
http://securitytracker.com/alerts/2006/Sep/1016874.html

Credit

Thanks to Citrix for information about this vulnerability.

This document was written by Ryan Giobbi.

Other Information

Date Public:2006-09-18
Date First Published:2006-11-10
Date Last Updated:2007-01-29
CERT Advisory: 
CVE-ID(s):CVE-2006-4846
NVD-ID(s):CVE-2006-4846
US-CERT Technical Alerts: 
Metric:1.15
Document Revision:43

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