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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.2568.3 K54724312: Linux kernel vulnerability CVE-2022-0492 25 November 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IP (all modules) BIG-IQ Centralized Management Traffix SDC Publisher: F5 Networks Operating System: Network Appliance Resolution: Mitigation CVE Names: CVE-2022-0492 Original Bulletin: https://support.f5.com/csp/article/K54724312 Comment: CVSS (Max): 7.3 CVE-2022-0492 (CVSS:3.0/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H) CVSS Source: F5 Networks Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H Revision History: November 25 2022: Updated the CVSS score November 23 2022: Vendor updated the advisory May 26 2022: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K54724312: Linux kernel vulnerability CVE-2022-0492 Original Publication Date: 26 May, 2022 Latest Publication Date: 22 Nov, 2022 Security Advisory Description A vulnerability was found in the Linux kernel's cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function. This flaw, under certain circumstances, allows the use of the cgroups v1 release_agent feature to escalate privileges and bypass the namespace isolation unexpectedly. (CVE-2022-0492) Impact An authenticated attacker may be able to exploit this vulnerability to disclose sensitive information, modify data, or cause a denial-of-service (DoS). Security Advisory Status F5 Product Development has assigned ID 1089233 (BIG-IP), ID 1089233-6 (BIG-IQ), and ID SDC-1772 and SDC-1773 (Traffix SDC) to this vulnerability. This issue has been classified as CWE-287: Improper Authentication. 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, point 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. Note: After a fix is introduced for a given minor branch, that fix applies to all subsequent maintenance and point releases for that branch, and no additional fixes for that branch will be listed in the table. For example, when a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to K51812227: Understanding security advisory versioning. Additionally, software versions preceding those listed in the Applies to (see versions) box of this article have reached the End of Technical Support (EoTS) phase of their lifecycle and are no longer evaluated for security issues. For more information, refer to the Security hotfixes section of K4602: Overview of the F5 security vulnerability response policy. +------------+------+--------------+----------+----------+------+-------------+ | | |Versions known|Fixes | |CVSSv3|Vulnerable | |Product |Branch|to be |introduced|Severity |score^|component or | | | |vulnerable^1 |in | |2 |feature | +------------+------+--------------+----------+----------+------+-------------+ | |17.x |17.0.0 |None | | | | | +------+--------------+----------+ | | | | |16.x |16.1.0 - |None | | | | | | |16.1.3 | | | | | | +------+--------------+----------+ | | | |BIG-IP (all |15.x |15.1.0 - |None | | | | |modules) | |15.1.8 | |High |7.0 |Linux Kernel | | +------+--------------+----------+ | | | | |14.x |14.1.0 - |None | | | | | | |14.1.5 | | | | | | +------+--------------+----------+ | | | | |13.x |13.1.0 - |None | | | | | | |13.1.5 | | | | | +------------+------+--------------+----------+----------+------+-------------+ |BIG-IQ |8.x |8.0.0 - 8.2.0 |None | | | | |Centralized +------+--------------+----------+High |7.0 |Linux Kernel | |Management |7.x |7.0.0 - 7.1.0 |None | | | | +------------+------+--------------+----------+----------+------+-------------+ |F5OS-A |1.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------+------+--------------+----------+----------+------+-------------+ |F5OS-C |1.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +------------+------+--------------+----------+----------+------+-------------+ |Traffix SDC |5.x |5.2.0 |None |High |7.3 |Linux Kernel | | | |5.1.0 | | | | | +------------+------+--------------+----------+----------+------+-------------+ ^1F5 evaluates only software versions that have not yet reached the End of Technical Support (EoTS) phase of their lifecycle. ^2The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Recommended Actions If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by installing a version listed in the Fixes introduced in column. If the Fixes introduced in column does not list a version for your branch, then no update candidate currently exists for that branch and F5 recommends upgrading to a version with the fix (refer to the table). If the Fixes introduced in column lists a version prior to the one you are running, in the same branch, then your version should have the fix. Mitigation As this attack is conducted by legitimate, authenticated users, there is no viable mitigation that also allows users access to the BIG-IP or BIG-IQ system. The only mitigation is to remove access for users who are not completely trusted. Until you can install a fixed version, you can use the following sections as temporary mitigations. These mitigations restrict access to the BIG-IP or BIG-IQ command line through SSH to only trusted networks or devices, thereby limiting the attack surface. o Block SSH access through self IP addresses o Block SSH access through the management interface Block SSH access through self IP addresses You can block all access to the command line through SSH of your BIG-IP or BIG-IQ system using self IP addresses. To do so, you can change the Port Lockdown setting to Allow None for each self IP address on the system. If you must open any ports, you should use the Allow Custom option, taking care to block access to SSH. By default, the SSH service listens on TCP port 22. Note: Performing this action prevents all access to SSH using the self IP address. These changes may also impact other services. Before you make changes to the configuration of your self IP addresses, F5 strongly recommends that you refer to the following articles: o K17333: Overview of port lockdown behavior (12.x - 17.x) o K39403510: Managing the port lockdown configuration on the BIG-IQ system o K13092: Overview of securing access to the BIG-IP system If you must expose port 22 on your self IP addresses and want to restrict access to specific IP ranges, you may consider using the packet filtering functionality built into the BIG-IP system. For more information, refer to the following article: o K13383: Configuring CIDR Network Addresses for the BIG-IP packet filter For BIG-IQ self IP addresses where port 22 is exposed, use an external packet filtering device such as the BIG-IP AFM system. Block SSH access through the management interface To mitigate this vulnerability for affected F5 products, you should restrict management access to F5 products to only trusted users and devices over a secure network. For more information about securing access to BIG-IP and BIG-IQ systems, refer to the following articles: o K13092: Overview of securing access to the BIG-IP system o K46122561: Restricting access to the BIG-IP management interface using network firewall rules o K92748202: Restricting access to the BIG-IQ management interface using network firewall rules Note: For BIG-IQ 7.x, secure the management interface by using an external packet filtering device such as the BIG-IP AFM system. Supplemental Information 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 K8986: F5 product support policies o K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 17.x) o K15106: Managing BIG-IQ product hotfixes o K15113: BIG-IQ hotfix and point release matrix 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 - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBY4BYaMkNZI30y1K9AQi0JQ/8CQsMZLaHVSJHn/0GUlt5i/Zt9umhDzLC bEo5Lr1YkrZn7CFzNCwjo7urnyXBuY6qwPY1q/FFj3k2wumyrJ4NZfwMoc7h6Y5X o5isg2s+ad59tJlC2dUNr4nuZ7UMZBcez+SHiqZw167OxG5e0Z4anT0mxbW7A161 kqiHh/ts3URxs7fTwV3N8KVuORlJbDhVS/Ghoo/Bl0jRlpt6A0BusblyYo6E5TCi 9iUzltHP5ipNEMXzoN2uHdr6fEnvoUPLKoN88BBmshMRP67SXVdnzdBbpNLgKm6D elQruN1TQcnQLPT3sNOza8V6CbAwKp4jV7bsS0JYc0TZsgX9toYdcQ5x5Xp8XO2V aVSLI4x3+XuWqVZ7U1yiEc7MoldB+qOPX+g4V//3fQm3nhFELpM3Sg4LjkpzEl8w 2iPOS35Hqjbo96gJUA3Fb+sDvNWV+e9vethMF8IwCsHXeTS3X0x9m6gJYcWccd8e AwpTkHVSDupIjXcahdfupondrtOUkYl85LEaUwR9lN9oa+qiCf3Z1KExI8Tvn5an 7uanpC6muwfwQ7kYE/dFjdXJIJXlcsnMEwr6+W28l8gIOeyxim0iWgRJvYkhmYec rvDBsCs/YWZemjqnI9gVdrFWcwOzkmALZl0fSmaQkoDWbVmbPZQPzDmbDXnUc99y pAJLR1ZAM54= =fVzA -----END PGP SIGNATURE-----