ESB-2018.0866.2 - UPDATE [Appliance] F5 BIG-IP products: Denial of service - Remote/unauthenticated 2018-05-07

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             AUSCERT External Security Bulletin Redistribution

                 K13540723:NTP vulnerability CVE-2018-7184
                                7 May 2018


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-2018-7184  

Reference:         ESB-2018.0679

Original Bulletin:

Revision History:  May    7 2018: Heuristic added to detect the vulnerability
                   March 27 2018: Initial Release

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K13540723:NTP vulnerability CVE-2018-7184

Security Advisory

Original Publication Date: 27 Mar, 2018

Security Advisory Description

ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the
"received" timestamp, which allows remote attackers to cause a denial of
service (disruption) by sending a packet with a zero-origin timestamp causing
the association to reset and setting the contents of the packet as the most
recent timestamp. This issue is a result of an incomplete fix for
CVE-2015-7704. (CVE-2018-7184)


When network time protocol (NTP) is configured with an unauthenticated peer,
time sources attackers may be able to temporarily disrupt synchronization
between BIG-IP and the peer NTP device by spoofing packets from the peer.

Security Advisory Status

F5 Product Development has assigned ID 709048 (BIG-IP), ID 709180 (BIG-IQ), ID
709179 (Enterprise Manager), and ID CPF-24829, CPF-24830 and CPF-24831 (Traffix
SDC) to this vulnerability. Additionally, BIG-IP iHealth may list Heuristic
H13540723 on the Diagnostics > Identified > Low page.

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|          |          |      |          |
|                   |13.x  |13.0.0 -  |None      |          |      |          |
|                   |      |13.1.0    |          |          |      |          |
|BIG-IP (LTM, AAM,  +------+----------+----------+          |      |          |
|AFM, Analytics,    |12.x  |12.1.0 -  |None      |          |      |          |
|APM, ASM, DNS, Edge|      |12.1.3    |          |          |      |          |
|Gateway, GTM, Link +------+----------+----------+Low       |3.1   |NTP       |
|Controller, PEM,   |      |11.6.1 -  |          |          |      |          |
|WebAccelerator,    |      |11.6.3    |          |          |      |          |
|WebSafe)           |11.x  |11.5.1 -  |None      |          |      |          |
|                   |      |11.5.3    |          |          |      |          |
|                   |      |11.2.1    |          |          |      |          |
|ARX                |6.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
|Enterprise Manager |3.x   |3.1.1     |None      |Low       |3.1   |NTP       |
|                   |5.x   |5.0.0 -   |None      |          |      |          |
|BIG-IQ Centralized |      |5.4.0     |          |Low       |3.1   |NTP       |
|Management         +------+----------+----------+          |      |          |
|                   |4.x   |4.6.0     |None      |          |      |          |
|BIG-IQ Cloud and   |1.x   |1.0.0     |None      |Low       |3.1   |NTP       |
|Orchestration      |      |          |          |          |      |          |
|F5 iWorkflow       |2.x   |2.0.1 -   |None      |Low       |3.1   |NTP       |
|                   |      |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   |NTP       |
|                   |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.

Note: For details about how Security Advisory articles are versioned, and what
versions are listed in the table, refer to K51812227: Understanding Security
Advisory versioning.

To determine the necessary upgrade path for your BIG-IQ system, you should
understand the BIG-IQ product offering name changes. For more information,
refer to K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems


To mitigate this vulnerability, you can use server mode instead of peer mode,
enable peer authentication, configure multiple time sources, and/or restrict
access to the network segments that are used to communicate with the NTP peer
to avoid spoofed traffic.

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 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

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