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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2468.7 K95343321: Linux kernel vulnerability (SegmentSmack) CVE-2018-5390 16 April 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2018-5390 Reference: ESB-2018.2401 ESB-2018.2380 ESB-2018.2361 ESB-2018.2348.3 Original Bulletin: https://support.f5.com/csp/article/K95343321 Revision History: April 16 2019: Updated with latest publication April 4 2019: Updated with latest publication March 27 2019: Updated with latest publication March 22 2019: Updated product table March 13 2019: Updated product table December 14 2018: Updated product table August 21 2018: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K95343321:Linux kernel vulnerability CVE-2018-5390 Security Advisory Original Publication Date: 07 Aug, 2018 Latest Publication Date: 16 Apr, 2019 Security Advisory Description Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service. (CVE-2018-5390 also known as SegmentSmack) Impact For products with vulnerable versions, this vulnerability allows a remote attacker to disrupt service. This vulnerability affects only the BIG-IP management port. For products with None in the Versions known to be vulnerable column, there is no impact. Security Advisory Status F5 Product Development has assigned IDs 739970 (BIG-IP), and ID CPF-24972 and CPF-24973 (Traffix SDC) to these vulnerabilities. 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 | | | |be |in | |1 |or feature | | | |vulnerable| | | | | +------------------+------+----------+----------+----------+------+-----------+ | |14.x |14.0.0 |14.1.0 | | | | | +------+----------+----------+ | | | |BIG-IP (LTM, AAM, |13.x |13.0.0 - |13.1.1.4 | | | | |AFM, Analytics, | |13.1.1 | | | | | |APM, ASM, DNS, +------+----------+----------+ | |Linux | |Edge Gateway, FPS,|12.x |12.1.0 - |12.1.4.1 |High |7.5 |kernel | |GTM, Link | |12.1.4 | | | |(management| |Controller, PEM, +------+----------+----------+ | |port) | |WebAccelerator) | |11.6.1 - | | | | | | |11.x |11.6.3 |11.6.4 | | | | | | |11.5.1 - |11.5.9 | | | | | | |11.5.8 | | | | | +------------------+------+----------+----------+----------+------+-----------+ |ARX |6.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------------+------+----------+----------+----------+------+-----------+ |Enterprise Manager|3.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------------+------+----------+----------+----------+------+-----------+ | |6.x |None |Not | | | | |BIG-IQ Centralized| | |applicable|Not | | | |Management +------+----------+----------+vulnerable|None |None | | |5.x |None |Not | | | | | | | |applicable| | | | +------------------+------+----------+----------+----------+------+-----------+ |BIG-IQ Cloud and |1.x |None |Not |Not |None |None | |Orchestration | | |applicable|vulnerable| | | +------------------+------+----------+----------+----------+------+-----------+ |F5 iWorkflow |2.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------------+------+----------+----------+----------+------+-----------+ | |5.x |5.0.0 - |None | | | | |Traffix SDC | |5.1.0 | |High |7.5 |Linux | | +------+----------+----------+ | |kernel | | |4.x |4.4.0 |None | | | | +------------------+------+----------+----------+----------+------+-----------+ ^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 To mitigate this vulnerability, you should permit management access to F5 products only over a secure network and restrict command line access for affected systems to trusted users. For more information, refer to K13309: Restricting access to the Configuration utility by source IP address (11.x - 14.x) and K13092: Overview of securing access to the BIG-IP system. Additionally, the BIG-IP standard virtual server mitigates this vulnerability for back-end servers using the full proxy architecture. The BIG-IP forwarding virtual server and its variants do not provide that mitigation for back-end servers. Supplemental Information o K51812227: Understanding Security Advisory versioning o K41942608: Overview of AskF5 Security Advisory articles o K4602: Overview of the F5 security vulnerability response policy o K4918: Overview of the F5 critical issue hotfix policy o K9970: Subscribing to email notifications regarding F5 products o K9957: Creating a custom RSS feed to view new and updated documents o K74374841: Linux kernel vulnerability CVE-2018-5391 o K8082: Overview of TCP connection setup for BIG-IP LTM virtual server types - --------------------------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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