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             AUSCERT External Security Bulletin Redistribution

       CVE-2019-13609 - CRLF Vulnerability in Citrix License Server
                            for Windows and VPX
                             6 September 2019


        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: 

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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 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

Security considerations for the admin console interface can be found at the
following URL:


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 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:



Citrix thanks Vahagn Vardanyan for working with us to protect Citrix customers.


|Date            |Change                                                      |
|27th August 2019|Initial Publication                                         |
|28th August 2019|Updated "Applicable Products" section to include Licensing  |

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