Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3037.2 SNMP vulnerability CVE-2019-20892 19 November 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 BIG-IP Products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Existing Account Resolution: Mitigation CVE Names: CVE-2019-20892 Original Bulletin: https://support.f5.com/csp/article/K45212738 Revision History: November 19 2020: Vendor issued minor branch updates for K45212738 September 4 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K45212738: SNMP vulnerability CVE-2019-20892 Original Publication Date: 04 Sep, 2020 Latest Publication Date: 19 Nov, 2020 Security Advisory Description net-snmp before 5.8.1.pre1 has a double free in usm_free_usmStateReference in snmplib/snmpusm.c via an SNMPv3 GetBulk request. NOTE: this affects net-snmp packages shipped to end users by multiple Linux distributions, but might not affect an upstream release. (CVE-2019-20892) Impact When exploited, this vulnerability may cause the SNMP process to restart, leading to a disruption in SNMP services. Security Advisory Status F5 Product Development has assigned ID 924961 (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, 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 |16.0.0 - |None | | | | | | |16.0.1 | | | | | | +------+----------+----------+ | | | | |15.x |15.1.0 - |15.1.2 | | | | | | |15.1.1 | | | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |Advanced WAF, AFM, |14.x |None |Not | | | | |Analytics, APM, | | |applicable| | | | |ASM, DDHD, DNS, +------+----------+----------+Medium |6.5 |SNMP | |FPS, GTM, Link |13.x |None |Not | | | | |Controller, PEM, | | |applicable| | | | |SSLO) +------+----------+----------+ | | | | |12.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |11.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+----------+------+----------+ | |7.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | |BIG-IQ Centralized |6.x |None |Not |Not |None |None | |Management | | |applicable|vulnerable| | | | +------+----------+----------+ | | | | |5.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+----------+------+----------+ |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. 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 can configure SNMPv3 to restrict access with a password, and to only trusted IP addresses. To do so, refer to K13535: Restricting SNMP 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 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: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX7XxUuNLKJtyKPYoAQgQpBAAjpKNsxnMumQcpLVfzRMuFftD2g8K8p5F pnYZXBp49BPqGEOXPJmBAuJV6WT0Eijwzm94Fm66oEUjD9so1adM82z0RK8oJxeN G5rOB5hILmta9DIulCGb+kNcimfmeLCaPwslSkttoWbAVsA44qgLDi4NiKr5Fww0 OCJBkSkQHA8HG1OQvIebwR9u5Z3n5htJCJZHK1tjR6DYgz7j4pynUeirXUSWprZq rpz663wm/izap6XATGFrnOZq6r95xZPl7381WlWm8D0WdTAyi77BgBsqPi+uFBpK 3PdewRtnuwrh+uqeiHiKXgb9XqZfIOXtJ1qaZDtcnSVUvtOsAOfF4czW83+kO+3c SgEqXA/IKxgGx9kwZ5GTkTSTyOXaWpphTsNLPk3b9QUJdAhebzg7z7cZ/aYZZPoq ZXjJ2YmEjV79QJLkif/2FcGwFZI14uAkKMhiZJan1Sx7kpuh7vq3qGaqVCKdRy35 ijlZHELZvbuD8qUrDvgJWpPWPbzoSy9J410mC4YH8OsDlBzbQvMN+tFd1cYHbeZ+ vEkLH3KS67R0YMfQ+pSV5V7e9HgJoGnqxsDTiHOkk/4Ut3q8E6A94cTb6+l7KD8z ZaN+pDxRGmQAkDLQ740vS0/ynI8U2u2qSTT3Vz2Ea7GWn+DttyuFUnNnwl4ukknC U/riSZjv9As= =G3ZO -----END PGP SIGNATURE-----