Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.4379.3 BIG-IP multiple vulnerabilities 22 February 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IP Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Cross-site Scripting -- Remote with User Interaction Reduced Security -- Remote with User Interaction Resolution: Patch/Upgrade CVE Names: CVE-2020-27713 CVE-2020-5950 CVE-2020-5949 CVE-2020-5948 Original Bulletin: https://support.f5.com/csp/article/K20984059 https://support.f5.com/csp/article/K05204103 https://support.f5.com/csp/article/K42696541 https://support.f5.com/csp/article/K37960100 Comment: This bulletin contains four (4) F5 Networks security advisories. Revision History: February 22 2021: Vendor updated advisory K42696541 December 21 2020: Vendor added fixed versions to product table December 11 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K20984059: BIG-IP LTM vulnerability CVE-2020-5949 Original Publication Date: Dec 11, 2020 Security Advisory Description Certain traffic pattern sent to a virtual server configured with an FTP profile can cause the FTP channel to break. (CVE-2020-5949) Impact FTP traffic is disrupted. FTP clients are unable to connect to the FTP server and commands issued to the FTP server stall or fail. Security Advisory Status F5 Product Development has assigned ID 933297 (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 |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |15.x |None |Not | | | | | | | |applicable| | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |Advanced WAF, AFM, |14.x |14.0.0 - |14.1.0 | | | | |Analytics, APM, | |14.0.1 | | | |FTP | |ASM, DDHD, DNS, +------+----------+----------+High |7.5 |virtual | |FPS, GTM, Link |13.x |13.1.0 - |13.1.3.5 | | |server | |Controller, PEM, | |13.1.3 | | | | | |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 disable global SYN cookie protection. To do so, perform the following procedure: Note: For more information about configuring SYN cookie protection, refer to K74451051: Configuring SYN cookie protection (13.x - 16.x). Impact of action: Performing the following procedure disables SYN cookie protection on the BIG-IP system. The impact of the following procedure depends on the specific environment. F5 recommends that you test any such changes during a maintenance window and consider the possible impact on your specific environment. 1. Log in to the BIG-IP Configuration utility. 2. Go to System > Configuration > Local Traffic > General. 3. In Default Per Virtual Server SYN Check Threshold, enter 0 (the default is 0). 4. In Global SYN Check Threshold, enter 0 (the default is 64000). 5. Clear the Hardware VLAN SYN Cookie Protection check box. 6. Select Update. Supplemental Information o K74451051: Configuring SYN cookie protection (13.x - 16.x) o K00164450: The syn-cookie-enable option replaces SYN Cookie Protection options 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 - -------------------------------------------------------------------------------- K05204103: F5 TMM vulnerability CVE-2020-5950 Original Publication Date: Dec 11, 2020 Security Advisory Description An early syncookie leaks forwarding flows if the virtual server has Clustered Multiprocessing (CMP) disabled and the BIG-IP AFM module is provisioned. ( CVE-2020-5950) Impact The BIG-IP system resources may be excessively consumed and potentially lead to a failover event. Traffic processing is disrupted while the Traffic Management Microkernel (TMM) restarts. If the affected F5 device is configured as part of a device group, the system triggers a failover to the peer device. Security Advisory Status F5 Product Development has assigned ID 909837 (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 |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |15.x |None |15.0.0 | | | | | +------+----------+----------+ | | | | |14.x |14.1.0 - |14.1.2.7 | | | | | | |14.1.2 | | | | | |BIG-IP (AFM) +------+----------+----------+Medium |5.3 |TMM | | |13.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |12.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |11.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+----------+------+----------+ | |16.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |15.x |None |Not | | | | | | | |applicable| | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | | | |Advanced WAF, |14.x |None |Not | | | | |Analytics, APM, | | |applicable|Not | | | |ASM, DDHD, DNS, +------+----------+----------+vulnerable|None |None | |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 None 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 - -------------------------------------------------------------------------------- K42696541: F5 TMUI XSS vulnerability CVE-2020-5948 Original Publication Date: 11 Dec, 2020 Latest Publication Date: 19 Feb, 2021 Security Advisory Description Undisclosed endpoints in iControl REST allow for a reflected XSS attack, which could lead to a complete compromise of the BIG-IP system if the victim user is granted the admin role. (CVE-2020-5948) Impact An attacker may exploit this vulnerability using a crafted URL to a reflected cross-site scripting (XSS) in an undisclosed page of the Configuration utility. Security Advisory Status F5 Product Development has assigned ID 911761 (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 |16.0.1 | | | | | +------+----------+----------+ | | | | |15.x |15.0.0 - |15.1.1 | | | | | | |15.1.0 | | | | | | +------+----------+----------+ | | | |BIG-IP (LTM, AAM, |14.x |14.1.0 - |14.1.2.8 | | | | |AFM, Analytics, | |14.1.2 | | | | | |APM, ASM, DNS, FPS,+------+----------+----------+High |7.5 |iControl | |GTM, Link |13.x |13.1.0 - |13.1.3.5 | | |REST | |Controller, PEM) | |13.1.3 | | | | | | +------+----------+----------+ | | | | |12.x |12.1.0 - |12.1.5.3 | | | | | | |12.1.5 | | | | | | +------+----------+----------+ | | | | |11.x |11.6.1 - |None | | | | | | |11.6.5 | | | | | +-------------------+------+----------+----------+----------+------+----------+ | |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 should permit management access to F5 products only over a secure network, and limit access to only trusted users. For more information about securing access to BIG-IP systems, refer to K13092: Overview of securing access to the BIG-IP system. The trusted users with access to the Configuration utility should take precaution when selecting hyperlinks from untrusted or unknown sources. The attack for this vulnerability is most likely to come in the form of a phishing attack. Acknowledgements F5 acknowledges Krzysztof Przybylski for bringing this issue to our attention and following the highest standards of coordinated disclosure. Note: This link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. 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 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 - -------------------------------------------------------------------------------- K37960100: TMM vulnerability CVE-2020-27713 Original Publication Date: Dec 11, 2020 Security Advisory Description In certain configurations, when a BIG-IP AFM HTTP security profile is applied to a virtual server and the BIG-IP system receives a request with specific characteristics, the connection is reset and the Traffic Management Microkernel (TMM) leaks memory. (CVE-2020-27713) Impact Connections to the BIG-IP system are inappropriately reset and TMM leaks memory. Security Advisory Status F5 Product Development has assigned ID 946581 (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 |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |15.x |None |Not | | | | |BIG-IP (LTM, AAM, | | |applicable| | | | |Advanced WAF, AFM,+------+----------+----------+ | | | |Analytics, APM, |14.x |None |14.0.0 | | | | |ASM, DDHD, DNS, +------+----------+----------+Medium |5.9 |TMM | |FPS, GTM, Link |13.x |13.1.3.4 |13.1.3.5 | | | | |Controller, PEM, +------+----------+----------+ | | | |SSLO) |12.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |11.x |None |Not | | | | | | | |applicable| | | | +------------------+------+----------+----------+-----------+------+----------+ | |7.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+Not | | | |BIG-IQ Centralized|6.x |None |Not |vulnerable^|None |None | |Management | | |applicable|2 | | | | +------+----------+----------+ | | | | |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. ^2The specified products contain the affected code. However, F5 identifies the vulnerability status as Not vulnerable because the attacker cannot exploit the code in default, standard, or recommended configurations. 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 disable either the BigDB key tmm.http.rfc.enforcement or the Bad host header value check in the HTTP security profile, or both, depending on your specific configuration. To do so, perform the following procedures: Disabling HTTP RFC enforcement Impact of action: This procedure removes the mitigation for the issue described in K50375550: A specifically crafted HTTP request may lead the BIG-IP system to pass malformed HTTP requests to a target pool member web server (HTTP Desync Attack) 1. Log in to the TMOS shell (tmsh) by typing the following command: tmsh 2. Disable the HTTP RFC enforcement by typing the following command: modify sys db tmm.http.rfc.enforcement value disable Disabling the Bad host header value check in the BIG-IP AFM HTTP security profile Impact of action: The BIG-IP AFM system does not check if a host header value is invalid. 1. Log in to the Configuration utility. 2. Go to Security > Protocol Security > Security Profiles > HTTP. 3. Select the profile you want to modify. 4. If necessary, select the Custom box for the Bad host header value setting. 5. Clear the box to the left of the Bad host header value. 6. Select Finished. 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 iQIVAwUBYDNCLONLKJtyKPYoAQg89hAAiX+oYv/IpMhHtSAvJZBiqZ1NsBC4H75m ExGV0piAWnYzsjQJVFBjiWK7k2j4qjzVD2vpRhZOrbDg2mVUTbBwZ3SEeGTr78BI RCnQYjMw/6m015S16423ghQSvR0F2vIjXt0F9s5bytCJatr9coI7bwTNiKr+lyDk kr9iYrlkshKj787nvY4sR781J1xFvs/EgNKbEvn0HDrNntSSAl/sCsDPfLbKn4EM fTclrhUBO/P4/pv3bDCvDLjoSK0IIUsWsppubsvswgsnHOJLarMaeX0xHRkP2AqN BXgOx50p51S3ptAs6DTA2erImTRHTewFdU4p7b3D2VDVqqMETURZlGUTLgbsaVZ/ Ic90rsYp2OU7Bw1Ve4eqhzvavKSkfMJ2EN24fKSsT/wcks9BLOqsUNi9y0y+zCuI hr7DeTfn7Jyf4241YcSb64iy8g9cfqKj7B8Ugi7MlKJBD/L8gF4n5P+Hav4oW2Ew IpFkBhTRfXVzM4Gs8p3B2bsNfkQ91D5NRZndMfLpRYB/QWZ0GHUfcQ1X6XhCCVXB yDF/v2xa+ChZjN0r6tB+oyrGKfhpdG+//T7iPJiXxG7tMsTWZoyt4z/hKif/5c98 V64Z8tawpGFtgaMA8YUo0qdWF9yk3KhRUTS0iepvciysKB512ID7SIx5UFNbredh 6fMSOgpUETk= =puIk -----END PGP SIGNATURE-----