Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4308 BIG-IP ASM JSON websocket security exposure 15 November 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 BIG-IP products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Reduced Security -- Remote/Unauthenticated Resolution: Patch/Upgrade Original Bulletin: https://support.f5.com/csp/article/K70312000 - --------------------------BEGIN INCLUDED TEXT-------------------- K70312000:BIG-IP ASM JSON websocket security exposure Security Advisory Original Publication Date: 15 Nov, 2019 Security Advisory Description The BIG-IP ASM system may fail to block bad JSON websocket requests. This issue occurs when all of the following conditions are met: o In the JSON profile of the affected security policy, the Parse Parameters setting is enabled. Note: This setting is enabled by default. o The offending request is sent as a JSON payload in a websocket connection. Impact The BIG-IP ASM system fails to detect the bad request and forwards it to the backend server. Symptoms As a result of this issue, you may encounter the following symptom: o The backend server receives a bad JSON websocket request when the BIG-IP ASM system should have blocked it. Security Advisory Status F5 Product Development has assigned ID 763001 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 | | +------------------+-----------------+----------------------------------------+ | |15.0.0 |K2200: Most recent versions of F5 | |Release |14.1.2 |software | | |13.1.3 | | +------------------+-----------------+----------------------------------------+ |Point release/ |14.1.0.6 |K9502: BIG-IP hotfix and point release | |hotfix |14.0.1.1 |matrix | +------------------+-----------------+----------------------------------------+ Security Advisory Recommended Actions Workaround To work around this issue, you can disable the Parse Parameters setting in the JSON profile of the affected security policy. To do so, perform the following procedure: Impact of workaround: When you disable the Parse Parameters setting, the system stops parsing parameters extracted from the JSON payload. In some application environments, this may affect non-websocket traffic. 1. Log in to the Configuration utility. 2. Go to Security > Application Security > Content Profiles > JSON Profiles. 3. Select the affected JSON profile. 4. For Parse Parameters, clear the Enabled check box. 5. Select Update. 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 - 15.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 iQIVAwUBXc33GWaOgq3Tt24GAQjM+BAAsne50cZKqOycbQkrMOuevqC23FKAennm A3hbJHHKMlvJtO70csyyt+IB2qcz7Qm6d4wYnlwpFDL3UROTuU1FrNlvgFdVeRlW Qj5JvUkrJvQsRFwk2QysC2m5JCSV0Swr7xAjPf7Zr00Nu+zOQmObVp+9DID299Ew shpuvK04cWi/GirU2LvHm3+K65OLrgUAQImu2BEqfXRVWapbulKSG2vTmTQMwdpp nBDfjkmaxarkQtvPsbsKyFefeofIMA2Y6ifKMWdsmky4dX3bSS8JZFxrnTcB+oEB qD5iR5vXH5YjSxWD3b3RmxZOEwbjp0ROcGZpt4+BN43c+ycDXQnOul7WAai6bzin wlQea4hoy0nVjDmoKlYsOPvb79BaHsml6LOUxlS7yCB0CW6BJlhd9C18Jme4j6jT UO1hpIKOBnvqii4KxAQi/uEWwFR6uSq5gZVS1OVY4QZBthMkqmSRQfAbrWtIhAd0 3TfvRHG1iMPwL9apKFvjVAzLyRFKNkiThK/7NxdHLXUWJBy2N//L2Ju/seHmIqz4 kVxR79fvjlJ4DSMXD0Shs7AxykNh63emspvHnT+hwdPTft5WDDeqZYPDiqKbRVdu BqnnHyGOnHidHlg8I+A9Xwesv8Eog9wO+8RiyYIxG5h5bZDVgUYHXck82oWKyhif iMSApi/8Lqc= =Y9cf -----END PGP SIGNATURE-----