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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.3621 Multiple Vulnerabilities in Citrix License Server for Windows and VPX 26 September 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix License Server Publisher: Citrix Operating System: Windows Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-20034 CVE-2018-20033 CVE-2018-20032 CVE-2018-20031 Reference: ESB-2019.2582 ESB-2019.2577 ESB-2019.1146 Original Bulletin: https://support.citrix.com/article/CTX261963 - --------------------------BEGIN INCLUDED TEXT-------------------- Multiple Vulnerabilities in Citrix License Server for Windows and VPX Reference: CTX261963 Category : Medium Created : 25 Sep 2019 Modified : 25 Sep 2019 Applicable Products o Licensing Description of Problem Multiple Denial-of-Service vulnerabilities have been identified in Citrix License Server for Windows and VPX that, when exploited, could result in an attacker being able to force the vendor service to shutdown. These vulnerabilities have been assigned the following CVE numbers: o CVE-2018-20031: A Denial of Service vulnerability in FlexNet Publisher version 11.16.1.0 and earlier o CVE-2018-20032: A Denial of Service vulnerability in FlexNet Publisher version 11.16.1.0 and earlier o CVE-2018-20033: A Remote Code Execution vulnerability in FlexNet Publisher version 11.16.1.0 and earlier o CVE-2018-20034: A Denial of Service vulnerability in FlexNet Publisher version 11.16.1.0 and earlier This vulnerability affects the following Citrix License Server versions: o Citrix License Server for Windows earlier than and including 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 vulnerabilities have been addressed in the following version: o Citrix License Server for Windows version 11.16.3 build 28000 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/ Changelog +--------------------------------------+--------------------------------------+ |Date |Change | +--------------------------------------+--------------------------------------+ |25th September 2019 |Initial Publication | +--------------------------------------+--------------------------------------+ - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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