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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0944.3 TMM vulnerability CVE-2019-6603 28 March 2019 =========================================================================== 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-2019-6603 Original Bulletin: https://support.f5.com/csp/article/K14632915 Revision History: March 28 2019: Added advisory update March 26 2019: Added advisory update March 22 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K14632915:TMM vulnerability CVE-2019-6603 Security Advisory Original Publication Date: 22 Mar, 2019 Latest Publication Date: 28 Mar, 2019 Security Advisory Description Malformed TCP packets sent to a self IP address or a FastL4 virtual server may cause an interruption of service. The control plane is not exposed to this issue. This issue impacts the data plane virtual servers and self IPs. ( CVE-2019-6603) Impact This vulnerability allows remote disruption of service. Security Advisory Status F5 Product Development has assigned ID 714181 (BIG-IP) to this vulnerability. To determine if your product and version have been evaluated for this vulnerability, refer to the Applies to (see versions) box. 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. For more information about security advisory versioning, refer to K51812227: Understanding Security Advisory versioning. +---------------+------+----------+----------+----------+------+--------------+ | | |Versions |Fixes | |CVSSv3|Vulnerable | |Product |Branch|known to |introduced|Severity |score^|component or | | | |be |in | |1 |feature | | | |vulnerable| | | | | +---------------+------+----------+----------+----------+------+--------------+ | |14.x |None |14.0.0 | | | | |BIG-IP (LTM, +------+----------+----------+ | |TMM when | |AAM, AFM, |13.x |13.0.0 - |13.1.0 | | |processing | |Analytics, APM,| |13.0.1 | | | |connections | |ASM, DNS, Edge +------+----------+----------+ | |for a self IP | |Gateway, FPS, |12.x |12.1.0 - |12.1.4 |High |7.5 |address, or a | |GTM, Link | |12.1.3 | | | |virtual server| |Controller, +------+----------+----------+ | |configured | |PEM, | |11.6.0 - | | | |with a FastL4 | |WebAccelerator)|11.x |11.6.3 |11.6.4 | | |profile. | | | |11.5.1 - |11.5.9 | | | | | | |11.5.8 | | | | | +---------------+------+----------+----------+----------+------+--------------+ |ARX |6.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +---------------+------+----------+----------+----------+------+--------------+ |Enterprise |3.x |None |Not |Not |None |None | |Manager | | |applicable|vulnerable| | | +---------------+------+----------+----------+----------+------+--------------+ | |6.x |None |Not | | | | | | | |applicable| | | | |BIG-IQ +------+----------+----------+ | | | |Centralized |5.x |None |Not |Not |None |None | |Management | | |applicable|vulnerable| | | | +------+----------+----------+ | | | | |4.x |None |Not | | | | | | | |applicable| | | | +---------------+------+----------+----------+----------+------+--------------+ |BIG-IQ Cloud | | |Not |Not | | | |and |1.x |None |applicable|vulnerable|None |None | |Orchestration | | | | | | | +---------------+------+----------+----------+----------+------+--------------+ |F5 iWorkflow |2.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +---------------+------+----------+----------+----------+------+--------------+ | |5.x |None |Not | | | | | | | |applicable|Not | | | |Traffix SDC +------+----------+----------+vulnerable|None |None | | |4.x |None |Not | | | | | | | |applicable| | | | +---------------+------+----------+----------+----------+------+--------------+ ^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Security Advisory 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 Fixes introduced in 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 Mitigation for self IP addresses To mitigate this issue for self IP addresses, you can use the port lockdown feature to disallow unneeded ports on all self IP addresses. For more information, refer to K13250: Overview of port lockdown behavior (10.x - 11.x) or K17333: Overview of port lockdown behavior (12.x - 14.x). Mitigation for FastL4 virtual servers There is no mitigation for non-Virtual Edition (VE) systems. For BIG-IP VE systems that have been configured with TCP Segmentation Offload (TSO) disabled, you can mitigate this vulnerability by enabling TSO. You can enable TSO by setting the value of the tm.tcpsegmentationoffload BigDB key to enable, and restarting the Traffic Management Microkernel (TMM). To do so, perform the following procedure: Note: TSO is enabled by default. This mitigation is only applicable if you have manually disabled TSO on the BIG-IP VE system. Impact of action: Because TSO enabled is the default value for BIG-IP systems, performing the following procedure should not have a negative impact on your system. However, if you have disabled TSO in your environment, the impact of the suggested mitigation depends on the specific environment. F5 recommends testing any such changes during a maintenance window with consideration to the possible impact on your specific environment. Additionally, restarting TMM temporarily interrupts traffic processing. 1. Log in to the TMOS Shell (tmsh) by typing the following command: tmsh 2. Enable TSO by typing the following command: modify sys db tm.tcpsegmentationoffload value enable 3. Restart TMM by typing the following command restart /sys service tmm Supplemental Information o K15609: Overview of TCP Segmentation Offload and Large Receive Offload o K51812227: Understanding Security Advisory versioning o K41942608: Overview of Security Advisory articles o K4602: Overview of the F5 security vulnerability response policy o K4918: Overview of the F5 critical issue hotfix policy - --------------------------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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