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Citrix Access Gateway Multiple Vulnerabilities
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Secunia Advisory:
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SA26143
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Release Date:
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2007-07-20
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Last Update:
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2007-11-06
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Popularity:
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10,972 views
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Critical:
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Highly critical
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Impact:
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Cross Site Scripting
Exposure of sensitive information
System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Citrix Access Gateway 4.x
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Instant alerts on relevant vulnerabilities 
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| CVE reference: | CVE-2007-3679
CVE-2007-4013
CVE-2007-4017
CVE-2007-4018
CVE-2007-0011
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Description:
Some vulnerabilities and a security issue have been reported in Citrix Access Gateway, which can be exploited by malicious people to disclose sensitive information, conduct cross-site request forgery attacks, or to compromise a user's system.
1) A security issue due to residual information left on the client device can be exploited to gain unauthorized access to a user’s active session.
This security issue is reported in Access Gateway Advanced Edition 4.5 and prior.
2) A design error in the EPA ActiveX control can be exploited to download and execute arbitrary files when a user visits a malicious website.
NOTE: Unspecified errors in other client components (Net6Helper.DLL and npCtxCAO.dll as Firefox plugin) of Access Gateway Standard and Advanced Editions have also been reported, which can be exploited to execute arbitrary code in context of the logged-in user.
These vulnerabilities are reported in Access Gateway Standard Edition 4.5.2 and prior and Access Gateway Advanced Editions version 4.5 and prior with appliance firmware 4.5.2 and prior.
3) The web-based administration console of an Access Gateway appliance allows an administrator to perform certain actions via HTTP requests without performing any validity checks to verify the request. This can be exploited to e.g. change certain configuration settings by enticing a logged-in administrator to visit a malicious web site.
This vulnerability is reported in Access Gateway model 2000 appliances with firmware version 4.5.2 and prior. Access Gateway Enterprise Edition is reportedly not affected.
A redirection issue that may facilitate phishing attacks has also been reported.
Solution:
Apply hotfix and update firmware to version 4.5.5.
Access Gateway Standard Edition 4.5:
http://support.citrix.com/article/CTX114028
Access Gateway Advanced Edition 4.5:
http://support.citrix.com/article/CTX112803
The vendor also recommends removing the following components from client devices:
VPN ActiveX components:
* Net6Helper.DLL (Friendly name: Net6Launcher Class, version number up to and including 4.5.2)
EPA Components (ActiveX):
* npCtxCAO.dll (Friendly name: CCAOControl Object, version number up to 4,5,0,0)
EPA Components (Firefox plugin):
* npCtxCAO.dll (Friendly name: Citrix Endpoint Analysis Client, present in two locations)
Provided and/or discovered by:
1) Martin O’Neal, Corsaire.
2) Michael White, Symantec.
3) The vendor credits Paul Johnston.
Changelog:
2007-07-23: Updated "Description" section. Added CVE reference and additional link from Symantec.
2007-07-27: Added CVE reference.
2007-10-23: Added link to "Original Advisory" section.
2007-11-06: Added CVE reference.
Original Advisory:
Citrix:
http://support.citrix.com/article/CTX113814
http://support.citrix.com/article/CTX113815
http://support.citrix.com/article/CTX113816
http://support.citrix.com/article/CTX113817
Symantec:
http://www.symantec.com/content/en/us/enterprise/research/SYMSA-2007-006.txt
Corsaire:
http://research.corsaire.com/advisories/c060905-001.txt
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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