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>> Citrix Access Gateway Multiple Remote Code Execution and Security Bypass Issues

Title : Citrix Access Gateway Multiple Remote Code Execution and Security Bypass Issues
VUPEN ID : VUPEN/ADV-2007-2583
CVE ID : CVE-2007-0011 - CVE-2007-3679 - CVE-2007-4013 - CVE-2007-4015 - CVE-2007-4016 - CVE-2007-4017 - CVE-2007-4018
Rated as : Critical 
Remotely Exploitable : Yes
Locally Exploitable : Yes
Release Date : 2007-07-20


Technical Description    Receive VUPEN Security alerts in a Text format  Receive VUPEN Security alerts in a PDF format  Receive VUPEN Security alerts in an XML format 

Multiple vulnerabilities have been identified in Citrix Access Gateway, which could be exploited by attackers to bypass security restrictions, disclose sensitive information or take complete control of an affected system.

The first issue is caused due to residual information being left on client devices, which could be exploited by an attacker to gain unauthorized access to a user's active session.

The second vulnerability is caused by errors in the "Net6Helper.DLL" and "npCtxCAO.dll" client components, which could be exploited by attackers to execute arbitrary code on a vulnerable client in the context of the user currently logged in.

The third issue is caused by an unspecified input validation error, which could be exploited by an attacker to redirect a user to an arbitrary web site.

The fourth vulnerability is caused by errors in the web based administration console, which could be exploited to perform unauthorized configuration changes on a vulnerable appliance via cross site request forgery attacks.

Affected Products

Citrix Access Gateway versions prior to 4.5.5
Citrix Access Gateway Advanced Edition versions prior to 4.5 HF1

Solution

Upgrade to Citrix Access Gateway version 4.5.5 :
http://support.citrix.com/article/CTX114028

Upgrade to Access Gateway Advanced Edition version 4.5 HF1 :
http://support.citrix.com/article/CTX112803

Additionally, remove the "Net6Helper.DLL" and "npCtxCAO.dll" components.

References

http://www.vupen.com/english/advisories/2007/2583
http://support.citrix.com/article/CTX113814
http://support.citrix.com/article/CTX113815
http://support.citrix.com/article/CTX113816
http://support.citrix.com/article/CTX113817

Credits

Vulnerabilities reported by Martin ONeal (Corsaire), Michael White (Symantec) and Paul Johnston.

ChangeLog

2007-07-20 : Initial release

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