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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0279 K23432927: The BIG-IP ASM system may redirect a client request to an incorrect URL 31 January 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 BIG-IP ASM Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Provide Misleading Information -- Remote with User Interaction Resolution: Patch/Upgrade Original Bulletin: https://support.f5.com/csp/article/K23432927 - --------------------------BEGIN INCLUDED TEXT-------------------- K23432927: The BIG-IP ASM system may redirect a client request to an incorrect URL Security Advisory Original Publication Date: Jan 30, 2019 Applies to (see versions): o Product: BIG-IP, BIG-IP ASM o 12.1.2, 12.1.1, 12.1.0, 11.6.2, 11.6.1, 11.5.4, 11.5.3, 11.5.2, 11.5.1 Security Advisory Description The BIG-IP ASM system may redirect a client request to an incorrect URL after the client browser passes the client-side integrity defense JavaScript challenge. This issue occurs when all of the following conditions are met: o You have enabled the Client Side Integrity Defense feature in a DoS profile associated with a virtual server. o A client request containing a certain structured URL is processed by the virtual server with the DoS profile. o The client browser passes the client-side integrity defense JavaScript challenge issued by the BIG-IP ASM system. Impact The client browser is redirected to an incorrect URL. If a malicious attacker triggers the DoS profile and then sends a maliciously crafted structured URL to unsuspecting users as part of a phishing attack, the users may be redirected to a malicious website. Symptoms As a result of this issue, you may encounter the following symptom: o The client browser is redirected to an incorrect URL instead of the original website. Security Advisory Status F5 Product Development has assigned ID 648617 and 669394 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 | | +------------------+------------------+---------------------------------------+ | |13.0.0 | | |Release |12.1.3 |K2200: Most recent versions of F5 | | |11.6.3 |software | | |11.5.5 | | +------------------+------------------+---------------------------------------+ |Point release/ |None |None | |hotfix | | | +------------------+------------------+---------------------------------------+ Security Advisory Recommended Actions Workaround None Acknowledgements F5 would like to acknowledge An Trinh of Viettel Cyber Security for bringing this issue to our attention and following the highest standards of responsible disclosure. 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 - 13.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 iQIVAwUBXFJrv2aOgq3Tt24GAQhzwg//SH5OzmCusc8b1M/eNfBef3rnQ7VQEEsc ETPJRp0IROA31ZpIrMfJJjjPxVYDDhXdsBFmBOIE0VQzrssIKkl4Zck0z2YQbcxr wozXSkZJEskh4xLMWwpwFbQQZxCSPmeCBHgNEqxECXpZfXGADWKcjE4NvPVEaKap CI7oz3yXct30CKnz9bOZQ3mwdIm55Inttm60de+cpMtkKcBL93vH1KYaml9pZ4WE e8XBCeKwece8KnK6c/Tb2H0isGb/YvT4tGeDO3//OBYLtay80lKHLl0ALYFlGs8e hrRwFueSl2KcsvT51zmo6fLzlHBFsF/ld5TDwkG9ebIGntTfk8IVDJ4ldmyrn6hU CJocdDH/q9JSs7p/VdqtBkHTm4sDak7Mzanjx+9AVZaH5sUWxGSbpGW+8rPb79aJ QnHkVTk+aQ7snHS5YxKGDgwPv+5yPtspqhH1ha1tyYKmOxG3gz5BGXY+MD79m+gl 1Q/BzrJCpD9TAE7Pek2BO5r2pVOapUcmLIyB6Ox2OqOLW3XOr3FIIlqQ+ZSAXx92 YlrrFz2qsdtoNCTmy7UrXpTpIR68PF/AQtc4ebkOVHzSO/iNU3RnenfjLCeUzSuT Eu40M8Rp3rQt48NN5OvZ8uoYDF+wTD+JoOkfkMs9rvZbViMLn0Owu2UT47O0eG8l ZM9nkxiJsug= =Ofim -----END PGP SIGNATURE-----