TITLE: Citrix Access Gateway Advanced Access Control Authentication Bypass
SECUNIA ADVISORY ID: SA21941
VERIFY ADVISORY: http://secunia.com/advisories/21941/
CRITICAL: Moderately critical
IMPACT: Security Bypass
WHERE: >From remote
SOFTWARE: Citrix Access Gateway 4.x http://secunia.com/product/6168/
DESCRIPTION: A vulnerability has been reported in Citrix Access Gateway, which can be exploited by malicious people to bypass certain security restrictions.
The vulnerability is caused due to an error in the LDAP authentication. This can be exploited to bypass the authentication process and login without providing any user credentials.
Successful exploitation requires that the Advanced Access Control option is set to use LDAP authentication.
The vulnerability has been reported in Citrix Access Gateway deployed with Advanced Access Control 4.2. Other versions may also be affected.
SOLUTION: Apply hotfix AAC420W004. http://support.citrix.com/article/CTX110439
PROVIDED AND/OR DISCOVERED BY: Reported by the vendor.
ORIGINAL ADVISORY: http://support.citrix.com/article/CTX110950
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
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