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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4547.3 Linux kernel and TMM vulnerability CVE-2020-25705 17 August 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IP BIG-IQ Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Existing Account Access Confidential Data -- Remote/Unauthenticated Reduced Security -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2020-25705 CVE-2018-10675 Reference: ESB-2020.4505 ESB-2020.4391 ESB-2020.4377 ESB-2020.4375 Original Bulletin: https://support.f5.com/csp/article/K09604370 https://support.f5.com/csp/article/K40540405 Revision History: August 17 2021: Vendor issues branch updates January 22 2021: K09604370 - Vendor added additional vulnerable component December 24 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K09604370: Linux kernel vulnerability CVE-2020-25705 Security Advisory Original Publication Date: Dec 24, 2020 Updated Date: Mar 19, 2021 Security Advisory Description A flaw in the way reply ICMP packets are limited in the Linux kernel functionality was found that allows to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypassing source port UDP randomization. The highest threat from this vulnerability is to confidentiality and possibly integrity, because software that relies on UDP source port randomization are indirectly affected as well. Kernel versions before 5.10 may be vulnerable to this issue. (CVE-2020-25705) Impact A remote off-path attacker can determine open User Datagram Protocol (UDP) source ports on a vulnerable system based on Internet Control Message Protocol (ICMP) error messages, making it possible to execute a "SAD DNS attack." Security Advisory Status F5 Product Development has assigned ID 974093 (BIG-IP) and ID 974093-4 and 974093-5 (BIG-IQ) 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, 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. +--------------+------+----------+----------+----------+------+---------------+ | | |Versions |Fixes | |CVSSv3|Vulnerable | |Product |Branch|known to |introduced|Severity |score^|component or | | | |be |in | |1 |feature | | | |vulnerable| | | | | +--------------+------+----------+----------+----------+------+---------------+ | |16.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | |BIG-IP (LTM, |15.x |None |Not | | | | |AAM, Advanced | | |applicable| | | | |WAF, AFM, +------+----------+----------+ | | | |Analytics, |14.x |None |14.1.0 | | |Linux kernel | |APM, ASM, +------+----------+----------+High |7.4 |(ICMP | |DDHD, DNS, |13.x |13.1.0 - |None | | |implementation)| |FPS, GTM, Link| |13.1.3 | | | | | |Controller, +------+----------+----------+ | | | |PEM, SSLO) |12.x |12.1.0 - |None | | | | | | |12.1.5 | | | | | | +------+----------+----------+ | | | | |11.x |11.6.1 - |None | | | | | | |11.6.5 | | | | | +--------------+------+----------+----------+----------+------+---------------+ | |8.x |None |8.0.0 | | | | | +------+----------+----------+ | | | | |7.x |7.0.0 - |None | | | | |BIG-IQ | |7.1.0 | | | |Linux kernel | |Centralized +------+----------+----------+High |7.4 |(ICMP | |Management |6.x |6.0.0 - |None | | |implementation)| | | |6.1.0 | | | | | | +------+----------+----------+ | | | | |5.x |5.4.0 |None | | | | +--------------+------+----------+----------+----------+------+---------------+ |Traffix SDC |5.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +--------------+------+----------+----------+----------+------+---------------+ ^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. 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 Block outgoing ICMP port unreachable messages on the management interface To mitigate this vulnerability on the management interface, you can block outgoing ICMP port unreachable messages. To do so, perform the following procedure: Impact of action: The impact of blocking ICMP packets depends on your specific environment. F5 recommends testing any such changes during a maintenance window with consideration to the possible impact on your specific environment. 1. Log in to the BIG-IP command line. 2. Block outgoing ICMP port unreachable messages by entering the following command: iptables -A OUTPUT -p icmp --icmp-type destination-unreachable -j DROP 3. Create a backup of the /config/startup file by entering the following command: cp /config/startup /config/startup.backup 4. Using a text editor, edit the /config/startup file. 5. To ensure iptables changes persist across a reboot, add the following lines at the end of the file: # For CVE-2020-25705 described in K09604370 # iptables -A OUTPUT -p icmp --icmp-type destination-unreachable -j DROP # 6. Save the /config/startup file and exit the editor. Supplemental Information o K14813: Detecting and mitigating DoS/DDoS attacks (11.4.x - 16.x) 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 - 16.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 - -------------------------------------------------------------------------------- K40540405: Linux kernel vulnerability CVE-2018-10675 Original Publication Date: 24 Dec, 2020 Latest Publication Date: 17 Aug, 2021 Security Advisory Description The do_get_mempolicy function in mm/mempolicy.c in the Linux kernel before 4.12.9 allows local users to cause a denial of service (use-after-free) or possibly have unspecified other impact via crafted system calls. ( CVE-2018-10675) Impact A local attacker can cause a denial-of-service (DoS) or other negative impacts on a vulnerable system. Security Advisory Status F5 Product Development has assigned ID 976181 (BIG-IP), ID 976409 (BIG-IQ), and CPF-25230 (Traffix SDC) 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, 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. +---------------------+------+----------+----------+--------+------+----------+ | | |Versions |Fixes | |CVSSv3|Vulnerable| |Product |Branch|known to |introduced|Severity|score^|component | | | |be |in | |1 |or feature| | | |vulnerable| | | | | +---------------------+------+----------+----------+--------+------+----------+ | |16.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |15.x |None |Not | | | | | | | |applicable| | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |Advanced WAF, AFM, |14.x |None |Not | | | | |Analytics, APM, ASM, | | |applicable| | |Linux | |DDHD, DNS, FPS, GTM, +------+----------+----------+Medium |5.5 |kernel | |Link Controller, PEM,|13.x |None |Not | | | | |SSLO) | | |applicable| | | | | +------+----------+----------+ | | | | |12.x |12.1.0 - |None | | | | | | |12.1.5 | | | | | | +------+----------+----------+ | | | | |11.x |11.6.1 - |None | | | | | | |11.6.5 | | | | | +---------------------+------+----------+----------+--------+------+----------+ | |8.x |None |8.0.0 | | | | | +------+----------+----------+ | | | | |7.x |7.0.0 - |None | | | | |BIG-IQ Centralized | |7.1.0 | | | |Linux | |Management +------+----------+----------+Medium |5.5 |kernel | | |6.x |6.0.0 - |None | | | | | | |6.1.0 | | | | | | +------+----------+----------+ | | | | |5.x |5.4.0 |None | | | | +---------------------+------+----------+----------+--------+------+----------+ |Traffix SDC |5.x |5.1.0 |5.1.0 CF |Medium |5.5 |Linux | | | | |22 | | |kernel | +---------------------+------+----------+----------+--------+------+----------+ ^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. 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 only trusted users. For more information about this mitigation that is applicable to the BIG-IP system, refer to K13309: Restricting access to the Configuration utility by source IP address (11.x - 16.x) and K13092: Overview of securing access to the BIG-IP 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 K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 16.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. 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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBYRsTFuNLKJtyKPYoAQgdSQ//fSU3buGD6Cg1c8AT/XHBp31gCL7cjRTH 8nRDTOJbVmC3Svy7Gbl6pUH09nhkuSgJ5yrsG8oyRj5XxxVXxVhr6zNu3J8YLlDf wFZ/eW1Mmcob/nZo2eyJmckwsIf11BzKzpxNqZIwacBPKSK+w1kC2Fht0vpb+ojg Uwq3wFQPg6mtcgu9tFSwMxJeCc0JMz8aaCHlVEygebTVURq7vRM6xF8vi7DdRry9 htcDSih3/5HaAiAPz+6dOq5YMllzoKFAXw2sIlaDKTiA9FgUkLvcjdr9pfn2YaoM fgovh0tRWpLnyzEXTdv+wBZxM2qSpMUBpPmAQF165lKqafkuJCYka6iu95tHz6O7 ipLEImafCYiqCSWLcBzgYEFUtZutWVcLuV3JUYWnqDH/9VX/bHrbn0R99L5Y3FiN kB/05W6ZX3wlbs+jeSV8HtzSZtF37snCOk901LdAXlJpvo6ozjssWJXRPbZa/UKG hCsYlhQUpquaWDuXlicRV+hnh5JlB0TY0RAcIzEbb2/el/yD5G5kzI2MS5FeZm/C 3MOKvGsnvY7Q8oAqw8d3t8aMhl/jTzKKsuOEIoK4YG0tmSq+jz41+I1affWAbOjt 9DtAgiYuniwoEF9KFiQWBFCQwAPt/477NLXrISFoc1fnSEFPoyoM6+r7vHF+msPJ ucxrMfmxe2c= =MvHd -----END PGP SIGNATURE-----