Vulnerabilities in Access Gateway Standard and Advanced Editions clients could result in arbitrary code execution
Severity: High
Description of Problem
The client components provided by Access Gateway Standard and Advanced Editions are subject to vulnerabilities that could allow an attacker to run arbitrary code on the client machine in the context of the user currently logged in.
These vulnerabilities are present in all versions of the client components provided by Access Gateway Standard Edition up to and including 4.5.2 and all versions of Access Gateway Advanced Editions up to and including version 4.5 with appliance firmware up to and including 4.5.2.
What Customers Should Do
These vulnerabilities have been addressed in the client components provided by Access Gateway Standard Edition version 4.5.5 and Access Gateway Advanced Edition 4.5 HF1 with appliance firmware version 4.5.5.
Due to this and other issues (listed below), Citrix strongly recommends that customers upgrade their Access Gateway appliance to firmware version 4.5.5 and upgrade to Access Gateway Advanced Edition 4.5 HF1.
Additionally, Citrix recommends that all instances of the following controls are removed 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)
All users must remove the listed components, even if they no longer use the client components to connect to a working deployment. Connecting to a server that installs an upgraded client will not remove the older, vulnerable version from their client machine.
The Access Gateway upgrades can be obtained from the following locations:
Access Gateway Appliance firmware 4.5.5:
- http://support.citrix.com/article/CTX114028
Advanced Access Control HF1:
- http://support.citrix.com/article/CTX112803
Related Bulletins
For information on bulletins related to this issue, please see the Citrix Support website:
http://support.citrix.com/article/CTX113814
http://support.citrix.com/article/CTX113816
http://support.citrix.com/article/CTX113817
Acknowledgements
Citrix would like to thank Michael White of Symantec for working with us to protect Citrix customers.
What Citrix Is Doing
Citrix is proactively notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Base at http://support.citrix.com/.
Obtaining Support on this Issue
If you require technical assistance with this issue, please contact Citrix Technical Support. Information for contacting Citrix Technical Support is available at http://support.citrix.com/.
Reporting Security Vulnerabilities to Citrix
Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities very seriously. If you would like to report a security issue to Citrix, please compose an e-mail to secure@citrix.com containing the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability.
