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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4562.5 BIND vulnerability CVE-2019-6477 8 July 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 BIG-IP products F5 Enterprise Manager F5 BIG-IQ F5 Traffix SDC Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-6477 Reference: ESB-2019.4419 ESB-2019.4410 Original Bulletin: https://support.f5.com/csp/article/K15840535 Revision History: July 8 2020: Vendor updated Security Advisory Status table, adding an additional branch June 19 2020: Vendor updated Security Advisory Status table February 11 2020: Updatedd Security Advisory Status table January 14 2020: Product table updated December 5 2019: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K15840535:BIND vulnerability CVE-2019-6477 Security Advisory Original Publication Date: 03 Dec, 2019 Latest Publication Date: 08 Jul, 2020 Security Advisory Description With pipelining enabled each incoming query on a TCP connection requires a similar resource allocation to a query received via UDP or via TCP without pipelining enabled. A client using a TCP-pipelined connection to a server could consume more resources than the server has been provisioned to handle. When a TCP connection with a large number of pipelined queries is closed, the load on the server releasing these multiple resources can cause it to become unresponsive, even for queries that can be answered authoritatively or from cache. (This is most likely to be perceived as an intermittent server problem). (CVE-2019-6477) Impact An attacker may be able to use TCP-pipelined queries to increase the load on the system, causing it to become unresponsive. Security Advisory Status F5 Product Development has assigned ID 852445 (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 |16.0.0 | | | | | +------+----------+----------+ | | | | |15.x |15.0.1 - |None | | | | | | |15.1.0 | | | | | | +------+----------+----------+ | | | |BIG-IP (LTM, AAM, |14.x |14.1.1 - |14.1.2.5 | | | | |AFM, Analytics, | |14.1.2 | | | | | |APM, ASM, DNS, FPS,+------+----------+----------+High |7.5 |BIND | |GTM, Link |13.x |13.1.2 - |13.1.3.4 | | | | |Controller, PEM) | |13.1.3 | | | | | | +------+----------+----------+ | | | | |12.x |12.1.5 |12.1.5.1 | | | | | +------+----------+----------+ | | | | |11.x |11.6.5 |11.6.5.2 | | | | | | |11.5.10 | | | | | +-------------------+------+----------+----------+----------+------+----------+ |Enterprise Manager |3.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | +-------------------+------+----------+----------+----------+------+----------+ | |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| | | +-------------------+------+----------+----------+----------+------+----------+ 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 If you have enabled TCP-pipelining, you can mitigate this vulnerability by disabling TCP-pipelining by adding the appropriate statement to the named.conf file. To do so, perform one of the following procedures: o Disabling TCP-pipelining from the Configuration utility o Disabling TCP-pipelining by editing the named.conf file Disabling TCP-pipelining from the Configuration utility 1. Log in to the Configuration utility. 2. Navigate to DNS > Zones > ZoneRunner > named Configuration. 3. To disable server TCP-pipelining, in the named Options box, add the following line to the options stanza: keep-response-order { any; }; 4. Select Update. Disabling TCP-pipelining by editing the named.conf file Impact of action: This procedure restarts the named service, which may affect the BIG-IP system responding to DNS queries. 1. Log in to the BIG-IP command line. 2. Navigate to /var/named/config by typing the following command: cd /var/named/config 3. Use a text editor to edit the named.conf file. For example: vi named.conf 4. To disable server TCP-pipelining, add the following line to the options stanza: keep-response-order { any; }; 5. Save the changes and exit the file. 6. Restart the named service by typing the following command: tmsh restart /sys service named Supplemental Information o K51812227: Understanding Security Advisory versioning 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 - 15.x) o K15106: Managing BIG-IQ product hotfixes o K15113: BIG-IQ hotfix and point release matrix 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). 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