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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.3214.3 libssh2 vulnerabilities CVE-2019-3856, CVE-2019-3857, and CVE-2019-3863 14 June 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IP BIG-IQ Centralized Management Traffix SDC Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction Denial of Service -- Remote with User Interaction Resolution: Mitigation CVE Names: CVE-2019-3863 CVE-2019-3857 CVE-2019-3856 Reference: ESB-2019.4341 ESB-2019.2638 ESB-2019.0996 Original Bulletin: https://support.f5.com/csp/article/K90011301 Revision History: June 14 2021: Vendor updated versions known to be vulnerable January 6 2021: Additional vulnerable versions added by vendor September 21 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K90011301: libssh2 vulnerabilities CVE-2019-3856, CVE-2019-3857, and CVE-2019-3863 Original Publication Date: 19 Sep, 2020 Latest Publication Date: 12 Jun, 2021 Security Advisory Description o CVE-2019-3856 An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. o CVE-2019-3857 An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. A remote attacker who compromises a SSH server may be able to execute code on the client system when a user connects to the server. o CVE-2019-3863 A flaw was found in libssh2 before 1.8.1. A server could send a multiple keyboard interactive response messages whose total length are greater than unsigned char max characters. This value is used as an index to copy memory causing in an out of bounds memory write error. Impact For CVE-2019-3856 and CVE-2019-3857, a remote attacker may be able to execute code on the client system when a user connects to the server. For CVE-2019-3863, an attacker may be able to initiate a response from the server in which the message length causes an out-of-bounds memory write. Security Advisory Status F5 Product Development has assigned ID 945181 (BIG-IP), ID 945181-6 (BIG-IQ), and CPF-25118 (Traffix SDK) 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 - |None | | | | | | |15.1.3 | | | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |Advanced WAF, AFM, |14.x |14.1.0 - |None | | | | |Analytics, APM, ASM, | |14.1.4 | | | | | |DDHD, DNS, FPS, GTM, +------+----------+----------+Medium |6.7 |libssh2 | |Link Controller, PEM,|13.x |13.1.0 - |None | | | | |SSLO) | |13.1.4 | | | | | | +------+----------+----------+ | | | | |12.x |12.1.0 - |None | | | | | | |12.1.6 | | | | | | +------+----------+----------+ | | | | |11.x |None |Not | | | | | | | |applicable| | | | +---------------------+------+----------+----------+--------+------+----------+ | |7.x |8.0.0 |None | | | | | +------+----------+----------+ | | | | |7.x |7.0.0 - |None | | | | |BIG-IQ Centralized | |7.1.0 | | | | | |Management +------+----------+----------+Medium |6.7 |libssh2 | | |6.x |6.0.0 - |None | | | | | | |6.1.0 | | | | | | +------+----------+----------+ | | | | |5.x |5.4.0 |None | | | | +---------------------+------+----------+----------+--------+------+----------+ |Traffix SDC |5.x |5.1.0 |None |High |7.5 |libssh2 | +---------------------+------+----------+----------+--------+------+----------+ ^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, limit access to the Advanced Shell (bash) to trusted users only. 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 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 - --------------------------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 iQIVAwUBYMbugONLKJtyKPYoAQjLQA/+IsZRCayoNONAsFT3N6OQgwSlyBkRHmt6 zkVDXHrtzhLJKWJpqaQIxUoafo4n3kQu2ly4aR2qlDY4Um2X96M41hx90R4poKXc NrnwNt3N5TF+VytXFaYMeSKVHrQJb4HypVjs5uA8OUeGl5x4c+tbR+IDDxoI50ZA wrSHD2P6zV1CB6iE8smMQb1DpERIAcg66nXG/T7BzDrEENKUauvPshwYt4DgSWNn 21gk+3Txx+D7AOzudQEjf2W79FbAlY/SGWLMx84R54XEIfefObR+CdMSt/yHvtsh lbJBkR/UqRdy9MTrdDnYZOohSkUEXIkvBFDntFnbt7YM0jpwOEgb7D8xlgu1pqpX TX9yza3CNkYwOW94s6w/wLkZzYL/ps+H5TMNdR8IfNMf3fDXKau+9AJ0g19ySpWX xhHnp1kqkaPSxNH5wpcw5Wya3xINSrqCJ2tVCjqEtrIYHa5bVnuUMhxpkrQ5K/1i VvGMWw1MG/R0s1Umi70twifr+AHDdMJmsFazUWJ1C5UGwn7xFjUDAh2JsewWz2H+ IZer3PVrN9c70EwGYf4v4loJPRvDqmaFUDr+2wGpHwdrl8EJrr1wpwfoXGuz553q Cms2XeOU2TfQIzUUBeetXK9qHDuarBySc8SyQrCt/jg55wr7TFCH/UfGVa84fg0p SEoMIDsuMtI= =L0/L -----END PGP SIGNATURE-----