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AUSCERT External Security Bulletin Redistribution
ESB-2019.3387
CVE-2019-13609 - CRLF Vulnerability in Citrix License Server
for Windows and VPX
6 September 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: Citrix License Server
Publisher: Citrix
Operating System: Windows
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Modify Arbitrary Files -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2019-13609
Original Bulletin:
https://support.citrix.com/article/CTX257644
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CVE-2019-13609 - CRLF Vulnerability in Citrix License Server for Windows and VPX
Reference: CTX257644
Category : Medium
Created : 27 Aug 2019
Modified : 28 Aug 2019
Applicable Products
o Licensing
Description of Problem
A Carriage Return Line Feed (CRLF) injection vulnerability has been identified
in Citrix License Server for Windows and VPX that could allow an
unauthenticated attacker to bypass authentication and allow a malicious website
to read or modify license server data of an existing logged on session.
This vulnerability has been assigned the following CVE number:
o CVE-2019-13609: CRLF Vulnerability in License Server for Windows and VPX
This vulnerability affects the following Citrix License Server versions:
o Citrix License Server for Windows earlier than 11.15.0.0 Build 27000.
o Citrix License Server VPX all supported versions.
Mitigating Factors
If access to admin console is restricted to trusted network the risk is
reduced.
Security considerations for the admin console interface can be found at the
following URL:
https://docs.citrix.com/en-us/licensing/current-release/getting-started.html
Under security considerations
"Configure the License Server environment so that only authorized
administrators on a trusted network can access the Licensing Administration
Console port. You achieve this outcome by using an appropriately configured
network or host-based firewall."
What Customers Should Do
The CRLF vulnerability has been addressed in the following version:
o Citrix License Server for Windows version 11.15.0.0 Build 27000 and newer.
Customers with Citrix License Server VPX will need to deploy the Windows
version for the fix.
Citrix recommends that customers upgrade their Citrix License Server
deployments to this version or later.
The updates can be obtained from the following location:
https://www.citrix.com/downloads/licensing/
Acknowledgements
Citrix thanks Vahagn Vardanyan for working with us to protect Citrix customers.
Changelog
+----------------+------------------------------------------------------------+
|Date |Change |
+----------------+------------------------------------------------------------+
|27th August 2019|Initial Publication |
+----------------+------------------------------------------------------------+
|28th August 2019|Updated "Applicable Products" section to include Licensing |
+----------------+------------------------------------------------------------+
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