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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0594 Authentication Bypass Vulnerability in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway 1 March 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Citrix NetScaler Application Delivery Controller Citrix NetScaler Gateway Publisher: Citrix Operating System: Network Appliance Virtualisation Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-5314 Original Bulletin: https://support.citrix.com/article/CTX232199 - --------------------------BEGIN INCLUDED TEXT-------------------- CTX232199 Authentication Bypass Vulnerability in Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway Security Bulletin | Medium | Created: 28 Feb 2018 | Modified: 28 Feb 2018 Applicable Products o NetScaler 12.0 o NetScaler 11.1 o NetScaler 11.0 o NetScaler Gateway 12.0 o NetScaler Gateway 11.1 o NetScaler Gateway 11.0 Description of Problem A vulnerability has been identified in the management interface of Citrix NetScaler Application Delivery Controller (ADC) and NetScaler Gateway that, if exploited, could allow an unauthenticated attacker with access to the NetScaler management interface to bypass authentication controls and execute arbitrary, read only commands on the NetScaler appliance. This vulnerability has been assigned the following CVE number: o CVE-2018-5314: Authentication Bypass Vulnerability in Citrix NetScaler ADC and NetScaler Gateway Management Interface This vulnerability affects the following product versions: o Citrix NetScaler ADC and NetScaler Gateway version 12.0 builds 41.16, 41.22, 41.24, 51.24 & 53.6 o Citrix NetScaler ADC and NetScaler Gateway version 11.1 builds 51.21, 51.26, 52.13, 53.11, 54.14, 54.16 & 55.10 o Citrix NetScaler ADC and NetScaler Gateway version 11.0 build 70.12 This vulnerability also affects the NetScaler Load Balancing instance distributed with Citrix NetScaler SD-WAN/CloudBridge 4000, 4100, 5000 and 5100 WAN Optimization Edition version 9.3.0 - ------------------------------------------------------------------------------- Mitigating Factors In order to exploit this vulnerability, an attacker would require access to the management interface of the NetScaler. In situations where customers have deployed their NetScaler ADC and NetScaler Gateway appliances in line with industry best practice, network access to this interface should already be restricted. - ------------------------------------------------------------------------------- What Customers Should Do This vulnerability has been addressed in the following versions of Citrix NetScaler ADC and NetScaler Gateway: o Citrix NetScaler ADC and NetScaler Gateway version 12.0 build 53.13 and later o Citrix NetScaler ADC and NetScaler Gateway version 11.1 build 55.13 and later o Citrix NetScaler ADC and NetScaler Gateway version 11.0 build 70.16 and later o Citrix NetScaler SD-WAN/CloudBridge 4000, 4100, 5000 and 5100 WAN Optimization Edition version 9.3.1 and later Citrix recommends that customers impacted by this vulnerability upgrade to a version of the Citrix NetScaler ADC, NetScaler Gateway and NetScaler SD-WAN/ Cloudbridge that contains a fix for this issue as soon as possible. These versions are available on the Citrix website at the following addresses: https://www.citrix.com/downloads/netscaler-adc/ https://www.citrix.com/downloads/netscaler-gateway/ https://www.citrix.com/downloads/netscaler-sd-wan/ In line with industry best practice, Citrix also recommends that customers limit access to the management interface to trusted traffic only. Citrix has published additional guidance on the secure configuration of NetScaler management interfaces. This can be found at the following location: https://support.citrix.com/article/CTX228148 - ------------------------------------------------------------------------------- Acknowledgements Citrix thanks xcuter, blankcon, nullbr4in, loupos, koredge of NAVER BUSINESS PLATFORM - IT Security (https://www.nbp-corp.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 https://www.citrix.com/support/open-a-support-case.html. - ------------------------------------------------------------------------------- Reporting Security Vulnerabilities Citrix welcomes input regarding the security of its products and considers any and all potential vulnerabilities seriously. For guidance on how to report security-related issues to Citrix, please see the following document: CTX081743 - - Reporting Security Issues to Citrix - ------------------------------------------------------------------------------- Changelog +--------------------------------------+--------------------------------------+ |Date |Change | +--------------------------------------+--------------------------------------+ |28th February 2018 |Initial publishing | +--------------------------------------+--------------------------------------+ - --------------------------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. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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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