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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2060 SOL52638558: RESOLV::lookup iRule command vulnerability CVE-2016-6876 31 August 2016 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 BIG-IP products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2016-6876 Original Bulletin: http://support.f5.com/kb/en-us/solutions/public/k/52/sol52638558.html - --------------------------BEGIN INCLUDED TEXT-------------------- SOL52638558: RESOLV::lookup iRule command vulnerability CVE-2016-6876 Security Advisory Original Publication Date: 08/30/2016 Vulnerability Description A specially crafted reply to DNS queries from RESOLV::lookup may consume excess system resources or possibly lead to a crash and failover. (CVE-2016-6876) Impact The BIG-IP system may consume excess system resources, or experience a Traffic Management Microkernel (TMM) core and fail over. This vulnerability can only be triggered if you use the RESOLV::lookup iRule command to resolve PTR records. Other configurations that use the RESOLV::lookup iRule command are not affected by this vulnerability. Security Issue Status F5 Product Development has assigned ID 550596 (BIG-IP) to this vulnerability. To determine if your release is known to be vulnerable, the components or features that are affected by the vulnerability, and for information about releases or hotfixes that address the vulnerability, refer to the following table: Product Versions known to be vulnerable Versions known to be not vulnerable Severity Vulnerable component or feature BIG-IP LTM 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.2.1 11.6.1 10.2.1 - 10.2.4 11.5.4 HF2 BIG-IP AAM 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.6.1 11.5.4 HF2 BIG-IP AFM 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.6.1 11.5.4 HF2 BIG-IP Analytics 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.2.1 11.6.1 11.5.4 HF2 BIG-IP APM 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.2.1 11.6.1 10.2.1 - 10.2.4 11.5.4 HF2 BIG-IP ASM 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.2.1 11.6.1 10.2.1 - 10.2.4 11.5.4 HF2 BIG-IP DNS 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 12.0.0 HF3 BIG-IP Edge Gateway 11.2.1 None Medium RESOLV::lookup iRule command 10.2.1 - 10.2.4 BIG-IP GTM 11.4.0 - 11.6.0 11.6.1 Medium RESOLV::lookup iRule command 11.2.1 11.5.4 HF2 10.2.1 - 10.2.4 BIG-IP Link Controller 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.2.1 11.6.1 10.2.1 - 10.2.4 11.5.4 HF2 BIG-IP PEM 12.0.0 12.1.0 - 12.1.1 Medium RESOLV::lookup iRule command 11.4.0 - 11.6.0 12.0.0 HF3 11.6.1 11.5.4 HF2 BIG-IP PSM 11.4.0 - 11.4.1 None Medium RESOLV::lookup iRule command 10.2.1 - 10.2.4 BIG-IP WebAccelerator 11.2.1 None Medium RESOLV::lookup iRule command 10.2.1 - 10.2.4 BIG-IP WOM 11.2.1 None Medium RESOLV::lookup iRule command 10.2.1 - 10.2.4 BIG-IP WebSafe None 12.0.0 - 12.1.1 Not vulnerable None 11.6.0 - 11.6.1 ARX None 6.2.0 - 6.4.0 Not vulnerable None Enterprise Manager None 3.1.1 Not vulnerable None FirePass None 7.0.0 Not vulnerable None BIG-IQ Cloud None 4.0.0 - 4.5.0 Not vulnerable None BIG-IQ Device None 4.2.0 - 4.5.0 Not vulnerable None BIG-IQ Security None 4.0.0 - 4.5.0 Not vulnerable None BIG-IQ ADC None 4.5.0 Not vulnerable None BIG-IQ Centralized Management None 5.0.0 Not vulnerable None 4.6.0 BIG-IQ Cloud and Orchestration None 1.0.0 Not vulnerable None F5 iWorkflow None 2.0.0 Not vulnerable None LineRate None 2.5.0 - 2.6.1 Not vulnerable None Traffix SDC None 5.0.0 Not vulnerable None 4.0.0 - 4.4.0 Vulnerability Recommended Actions If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by upgrading to a version listed in the Versions known to be not vulnerable column. If the table lists only an older version than what you are currently running, or does not list a non-vulnerable version, then no upgrade candidate currently exists. To mitigate this vulnerability, you can avoid using the RESOLV::lookup iRule command to resolve PTR records. Supplemental Information SOL9970: Subscribing to email notifications regarding F5 products SOL9957: Creating a custom RSS feed to view new and updated documents SOL4602: Overview of the F5 security vulnerability response policy SOL4918: Overview of the F5 critical issue hotfix policy SOL167: Downloading software and firmware from F5 SOL13123: Managing BIG-IP product hotfixes (11.x - 12.x) SOL10025: Managing BIG-IP product hotfixes (10.x) SOL9502: BIG-IP hotfix matrix The RESOLV::lookup DevCentral page - --------------------------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: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== 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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