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             AUSCERT External Security Bulletin Redistribution

                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: 

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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. (


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.


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.

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