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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0512 The BIG-IP ASM system may not properly perform signature checks on cookies 11 February 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: The BIG-IP (ASM) Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Reduced Security -- Unknown/Unspecified Resolution: Patch/Upgrade Original Bulletin: https://support.f5.com/csp/article/K88162221 - --------------------------BEGIN INCLUDED TEXT-------------------- K88162221: The BIG-IP ASM system may not properly perform signature checks on cookies Original Publication Date: 11 Feb, 2021 Security Advisory Description The BIG-IP ASM system may not properly perform signature checks on cookies. This issue occurs when the following condition is met: o You have a security policy enabled with cookie scope attack signatures. Impact Cookies containing malicious payload may pass through the system without logging a violation. Symptoms As a result of this issue, you may encounter the following symptom: o Some attack signatures do not match a cookie with malicious content, and the system forwards the cookie to the backend hosts without logging a violation. Security Advisory Status F5 Product Development has assigned ID 918933 to this issue. F5 has confirmed that this issue exists in the products listed in the Applies to (see versions) box, located in the upper-right corner of this article. For information about releases, point releases, or hotfixes that resolve this issue, refer to the following table. +------------------+-----------------+----------------------------------------+ |Type of fix |Fixes introduced |Related articles | | |in | | +------------------+-----------------+----------------------------------------+ |Release |15.1.2 |K2200: Most recent versions of F5 | | | |software | +------------------+-----------------+----------------------------------------+ |Point release/ |16.0.1.1 |K9502: BIG-IP hotfix and point release | |hotfix |14.1.2.8 |matrix | | |13.1.3.6 | | +------------------+-----------------+----------------------------------------+ Security Advisory Recommended Actions Workaround None Supplemental Information o K51812227: Understanding security advisory versioning o K41942608: Overview of AskF5 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 iQIVAwUBYCTSaeNLKJtyKPYoAQgjew/+NUYsUkhvtr2Kmekr3+t79rKVHWptsY9X bUyKY6e/tzG1NwPd3CLZCZybHSGcgb6B1jw1ca1A6s5ffWUGsqUNuF7akW0O326P c/bN+yZATzyl885jHdjv35WSvpvlZcF2kneLV891aSZbSduVzqaI1KWHnj+sZa1s yfhePcCmFhnKfwCNPofVja+5V6julW34Lji7AiAJ7Y+VwyOygXyB1KUGE62c+Viv xO99PP/MCNQ+mgERixT0RiVkDyDrJkY81d5UJMK/Q/8ylPkiL292LJblmug2nh+K ML7rklUgdrzNDl16ds9uRQUkpgAIQs/TJTtWNGdEoERbSi5urA85oGUnLy93QwIr ti9O95kkLJCEns39QINnM4rlMRk7obfKck6FsSVH22sZ7wSTnAzV/pbiYTRa3ekc q2IZljr2EK5LAY3aB81G0icXllN/9PDKmX/3iZ66iUOqPQBsnifqLZNI0kxx+3+j ULjTkARxEqublsIA6hY1Bwm3fnY+yVgc5R4A1g859yemZCZNIFQ6e2gy54GxqT/8 X54PQTz0jgBn16lY2f/KjtyhAimvcN2o+xArVWnV7p+RJMQNR/fh0S/nYAWgYLdM TCfU/jOVnigr3saV1ND112qXjhuwEyIZHyREzGAWErvr/S1FY8a1WfxdIcILJu8j owRKFOTjrUA= =R+sh -----END PGP SIGNATURE-----