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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.1636.4 K00854051:Linux kernel vulnerability CVE-2018-13405 4 November 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 Products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Increased Privileges -- Existing Account Access Confidential Data -- Existing Account Resolution: Mitigation CVE Names: CVE-2018-13405 Reference: ASB-2019.0002 ESB-2019.1213 ESB-2018.3020 ESB-2018.2716 Original Bulletin: https://support.f5.com/csp/article/K00854051 Revision History: November 4 2020: Vendor updated branch 16.x fix details October 19 2020: Fixed versions added to advisory May 14 2019: Added heuristic information for BIG-IP iHealth May 10 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K00854051:Linux kernel vulnerability CVE-2018-13405 Security Advisory Original Publication Date: 10 May, 2019 Latest Publication Date: 03 Nov, 2020 Security Advisory Description The inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID. (CVE-2018-13405) Impact Local users are able to create files with an unintended group ownership, allowing attackers to escalate privileges and obtain sensitive information that may aid in further attacks. Security Advisory Status F5 Product Development has assigned ID 778049 (BIG-IP and BIG-IQ), and ID CPF-25082 and CPF-25083 (Traffix SDC) to this vulnerability. Additionally, BIG-IP iHealth may list Heuristic H00854051 on the Diagnostics > Identified > Medium page. 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| | | | | +---------------------+------+----------+----------+--------+------+----------+ | |16.x |16.0.0 |16.0.1 | | | | | +------+----------+----------+ | | | | | |15.1.0 |15.1.1 | | | | | |15.x |15.0.0 - |15.0.1.4 | | | | | | |15.0.1 | | | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |AFM, Analytics, APM, |14.x |14.0.0 - |None | | | | |ASM, DNS, Edge | |14.1.2 | | | |Linux | |Gateway, FPS, GTM, +------+----------+----------+Medium |4.4 |kernel | |Link Controller, PEM,|13.x |13.0.0 - |None | | |(BaseOS) | |WebAccelerator) | |13.1.3 | | | | | | +------+----------+----------+ | | | | |12.x |12.1.0 - |None | | | | | | |12.1.5 | | | | | | +------+----------+----------+ | | | | |11.x |11.5.2 - |None | | | | | | |11.6.5 | | | | | +---------------------+------+----------+----------+--------+------+----------+ | | | | | | |Linux | |Enterprise Manager |3.x |3.1.1 |None |Medium |4.4 |kernel | | | | | | | |(BaseOS) | +---------------------+------+----------+----------+--------+------+----------+ | |6.x |6.0.0 - |None | | | | |BIG-IQ Centralized | |6.1.0 | | | |Linux | |Management +------+----------+----------+Medium |4.4 |kernel | | |5.x |5.0.0 - |None | | |(BaseOS) | | | |5.4.0 | | | | | +---------------------+------+----------+----------+--------+------+----------+ | | | | | | |Linux | |F5 iWorkflow |2.x |2.3.0 |None |Medium |4.4 |kernel | | | | | | | |(BaseOS) | +---------------------+------+----------+----------+--------+------+----------+ | | |5.0.0 - | | | |Linux | |Traffix SDC |5.x |5.1.0 |None |Medium |4.4 |kernel | | | | | | | |(BaseOS) | +---------------------+------+----------+----------+--------+------+----------+ ^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 BIG-IP, BIG-IQ, iWorkflow, and Enterprise Manager To mitigate this vulnerability, you should permit connectivity access to the affected F5 products only over a secure network and restrict access for the affected systems to only trusted users. For more information, refer to the following articles: o K13309: Restricting access to the Configuration utility by source IP address (11.x - 14.x) o K13092: Overview of securing access to the BIG-IP system o K31401771: Restricting access to the BIG-IQ or F5 iWorkflow user interface by source IP address o K39403510: Managing the port lockdown configuration on the BIG-IQ system Supplemental Information 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 o K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 13.x) o K15106: Managing BIG-IQ product hotfixes o K15113: BIG-IQ hotfix and point release matrix o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM systems (11.4.x and later) o K167: Downloading software and firmware from F5 o K9970: Subscribing to email notifications regarding F5 products o K9957: Creating a custom RSS feed to view new and updated documents o K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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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