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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

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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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Definitions: (Criticality, Where etc.)
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Please Note:
Secunia recommends that you verify all advisories you receive by
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Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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