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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1117 NTP vulnerability mitigation in F5 products 12 April 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: F5 Networks products Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2018-7185 Reference: ESB-2018.0679 Original Bulletin: https://support.f5.com/csp/article/K04912972 - --------------------------BEGIN INCLUDED TEXT-------------------- K04912972: NTP vulnerability CVE-2018-7185 Security Advisory Original Publication Date: Apr 10, 2018 Security Advisory Description The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim ntpd to reset its association. ( CVE-2018-7185) Impact An attacker can exploit this vulnerability using crafted packets to cause the affected ntpd to reset its peer association. Only F5 products configured with authenticated interleaved peer association on the network time protocol (NTP) service are vulnerable, and this is a non-default configuration. Security Advisory Status F5 Product Development has assigned ID 713558 (BIG-IP), ID 713694 (BIG-IQ and iWorkflow), ID 713693 (Enterprise Manager), and ID CPF-24832, CPF-24833, and CPF-24834 (Traffix SDC) 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 or hotfixes that address the vulnerability, refer to the following table. +-----------------------------------------------------------------------------+ | | |Versions |Fixes | |CVSSv3|Vulnerable| |Product |Branch|known to |introduced|Severity |score^|component | | | |be |in | |1 |or feature| | | |vulnerable| | | | | |-------------------+------+----------+----------+----------+------+----------| |BIG-IP (LTM, AAM, |13.x |13.0.0 - |None | | | | |AFM, Analytics, | |13.1.0 | | | | | |APM, ASM, DNS, Edge|------+----------+----------| | | | |Gateway, GTM, Link |12.x |12.1.0 - |None |Low |3.1 |NTP | |Controller, PEM, | |12.1.3 | | | | | |WebAccelerator, |------+----------+----------| | | | |WebSafe) |11.x |11.5.1 - |None | | | | | | |11.6.3 | | | | | |-------------------+------+----------+----------+----------+------+----------| |ARX |6.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | |-------------------+------+----------+----------+----------+------+----------| |Enterprise Manager |3.x |3.1.1 |None |Low |3.1 |None | |-------------------+------+----------+----------+----------+------+----------| | |5.x |5.0.0 - |None | | | | |BIG-IQ Centralized | |5.4.0 | |Low |3.1 |None | |Management |------+----------+----------| | | | | |4.x |4.6.0 |None | | | | |-------------------+------+----------+----------+----------+------+----------| |BIG-IQ Cloud and |1.x |1.0.0 |None |Low |3.1 |None | |Orchestration | | | | | | | |-------------------+------+----------+----------+----------+------+----------| |F5 iWorkflow |2.x |2.0.2 - |None |Low |3.1 |None | | | |2.3.0 | | | | | |-------------------+------+----------+----------+----------+------+----------| |LineRate |2.x |None |Not |Not |None |None | | | | |applicable|vulnerable| | | |-------------------+------+----------+----------+----------+------+----------| | |5.x |5.0.0 - |None | | | | | | |5.1.0 | | | | | |Traffix SDC |------+----------+----------|Low |3.1 |None | | |4.x |4.0.5 - |None | | | | | | |4.4.0 | | | | | +-----------------------------------------------------------------------------+ ^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 There is no mitigation. However, F5 recommends that you configure multiple time sources, and restrict access to the network segments that are used to communicate with the NTP peer to avoid spoofed traffic. - --------------------------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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