CVE-2013-2767 – Vulnerability in Citrix NetScaler Access Gateway Enterprise Edition Could Result in Unauthorized Access to Network Resources

Description of Problem

A vulnerability has been identified in NetScaler Access Gateway Enterprise Edition that could allow a remote attacker to gain unauthorized access to internal network resources.

This vulnerability has been assigned the following CVE number:

    • CVE-2013-2767

This vulnerability affects the following NetScaler Access Gateway Enterprise Edition configurations:

    • All appliance firmware versions up to and including version 9.3.61.5 with the exception of Common Criteria build 9.3.53.6.

    • All version 10.0 appliance firmware up to and including version 10.0.74.4 when deployed in a double hop configuration only.

Customers using an appliance with appliance firmware version 10.0 that is not deployed in a double hop configuration are not affected by this vulnerability.

What Customers Should Do

A new version of the NetScaler appliance firmware has been released to address this vulnerability. Citrix strongly recommends that affected customers upgrade their appliances to version 9.3.62.4 or later as soon as possible. Customers using NetScaler Access Gateway Enterprise Edition in the Common Criteria evaluated configuration should upgrade to 9.3.53.6.

These new firmware versions can be downloaded from the Citrix website at the following location:

https://www.citrix.com/downloads/netscaler-adc/firmware.html

Customers not using the double hop feature should ensure that the double hop configuration option is disabled on the appliance.

Customers using all currently supported versions of the NetScaler appliance firmware with double hop configuration enabled should apply the following configuration change from the NSCLI:

>add ns acl allowedHost ALLOW -srcIP <MIP/SNIP address of AGEE in the first DMZ> -destIP <ICA proxy VIP> -priority 10 #permit traffic only from the AGEE appliance in the first DMZ

>enable ns acl allowedHost

>add ns acl denyAll DENY -srcIP 0.0.0.0 – 255.255.255.255 -destIP <ICA proxy VIP> -priority 20 #block everything else

>enable ns acl denyAll

>apply ns acls

Acknowledgements

Citrix thanks HyeongKwan Lee of SK Planet (http://www.sk.com/) for working with us to protect Citrix customers.

What Citrix Is Doing

Citrix is notifying customers and channel partners about this potential security issue. This article is also available from the Citrix Knowledge Center at http://support.citrix.com/.

Obtaining Support on This Issue

If you require technical assistance with this issue, please contact Citrix Technical Support. Contact details for Citrix Technical Support are available at http://www.citrix.com/site/ss/supportContacts.asp.

Reporting Security Vulnerabilities to Citrix

Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. If you would like to report a security issue to Citrix, please compose an e-mail to secure@citrix.com stating the exact version of the product in which the vulnerability was found and the steps needed to reproduce the vulnerability.

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