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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2016.2824 SOL36300805: BIG-IP FastL4 profile vulnerability 30 November 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: Mitigation Original Bulletin: https://support.f5.com/kb/en-us/solutions/public/k/36/sol36300805.html - --------------------------BEGIN INCLUDED TEXT-------------------- SOL36300805: BIG-IP FastL4 profile vulnerability Security Advisory Original Publication Date: 11/29/2016 Vulnerability Description Under certain conditions for BIG-IP systems using FastL4 profiles, when the Reassemble IP Fragments option is disabled (default), a specific sequence of fragmented packets may restart the Traffic Management Microkernel (TMM). Impact An attacker may be able to disrupt traffic or cause the BIG-IP system to fail over to another device in the device group. Security Issue Status F5 Product Development has assigned ID 509858 (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 V ulnerable component or feature BIG-IP LTM 12.0.0 - 12.1.1 10.2.1 - 10.2.4 Low TMM 11.4.0 - 11.6.1 11.2.1 BIG-IP AAM 12.0.0 - 12.1.1 None Low TMM 11.4.0 - 11.6.1 BIG-IP AFM 12.0.0 - 12.1.1 None Low TMM 11.4.0 - 11.6.1 BIG-IP Analytics 12.0.0 - 12.1.1 None Low TMM 11.4.0 - 11.6.1 11.2.1 BIG-IP APM 12.0.0 - 12.1.1 10.2.1 - 10.2.4 Low TMM 11.4.0 - 11.6.1 11.2.1 BIG-IP ASM 12.0.0 - 12.1.1 10.2.1 - 10.2.4 Low TMM 11.4.0 - 11.6.1 11.2.1 BIG-IP DNS 12.0.0 - 12.1.1 None Low TMM BIG-IP Edge Gateway 11.2.1 10.2.1 - 10.2.4 Low TMM BIG-IP GTM 11.4.0 - 11.6.1 10.2.1 - 10.2.4 Low TMM 11.2.1 BIG-IP Link Controller 12.0.0 - 12.1.1 10.2.1 - 10.2.4 Low TMM 11.4.0 - 11.6.1 11.2.1 BIG-IP PEM 12.0.0 - 12.1.1 None Low TMM 11.4.0 - 11.6.1 BIG-IP PSM 11.4.0 - 11.4.1 10.2.1 - 10.2.4 Low TMM BIG-IP WebAccelerator 11.2.1 10.2.1 - 10.2.4 Low TMM 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 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 - 5.1.0 Not vulnerable None 4.6.0 BIG-IQ Cloud and Orchestration None 1.0.0 Not vulnerable None F5 iWorkflow None 2.0.0 - 2.0.2 Not vulnerable None LineRate None 2.5.0 - 2.6.1 Not vulnerable None Traffix SDC None 5.0.0 - 5.1.0 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. Mitigation To mitigate this vulnerability, you can use the Configuration utility or the Traffic Management Shell (tmsh) to enable the Reassemble IP Fragments option. To do so, perform one of the following procedures: Using the Configuration utility to enable the Reassemble IP Fragments option Using the tmsh utility to enable the Reassemble IP Fragments option Using the Configuration utility to enable the Reassemble IP Fragments option Impact of action: Performing the following procedure should not have a negative impact on your system. 1. Log in to the Configuration utility. 2. Navigate to Local Traffic > Profiles > Protocol > FastL4. 3. Select the profile to edit. 4. Select the Reassemble IP Fragments check box. 5. Click Update. Using the tmsh utility to enable the Reassemble IP Fragments option Impact of action: Performing the following procedure should not have a negative impact on your system. 1. Log in to the tmsh utility by typing the following command: tmsh 2. Enable the Reassemble IP Fragments option by using the following command syntax: modify /ltm profile fastl4 <profile_name> reassemble-fragments enabled For example: modify /ltm profile fastl4 example_fastl4 reassemble-fragments enabled 3. Save the change by typing the following command: save /sys config 4. To exit the tmsh utility, type the following command: quit 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 - --------------------------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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