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             AUSCERT External Security Bulletin Redistribution

                               ESB-2013.0597
 Vulnerability in Citrix NetScaler Access Gateway Enterprise Edition Could
            Result in Unauthorized Access to Network Resources
                               29 April 2013

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           NetScaler Access Gateway Enterprise Edition
Publisher:         Citrix
Operating System:  Windows Server 2008 R2
                   Network Appliance
                   VMWare ESX Server
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2013-2767  

Original Bulletin: 
   http://support.citrix.com/article/CTX137238

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Vulnerability in Citrix NetScaler Access Gateway Enterprise Edition Could 
Result in Unauthorized Access to Network Resources

Document ID: CTX137238
Created On: 25/04/2013
Updated On: 25/04/2013

Severity: Critical

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 using NetScaler appliance firmware versions up to and including 
10.0.74.4 in a double hop deployment should apply the following configuration 
change from the NSCLI:
>add ns acl allowedHost ALLOW -srcIP -destIP -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 -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.

This document applies to:

Access Gateway 9.1 Enterprise Edition
Access Gateway 9.2 Enterprise Edition
Access Gateway 9.3 Enterprise Edition
NetScaler 9.1
NetScaler 9.2
NetScaler 9.2.e
NetScaler 9.3
NetScaler 9.3.e
NetScaler VPX 9.1
NetScaler VPX 9.2
NetScaler VPX 9.3

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