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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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