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             AUSCERT External Security Bulletin Redistribution

    K95343321: Linux kernel vulnerability (SegmentSmack) CVE-2018-5390
                              14 August 2018


        AusCERT Security Bulletin Summary

Product:           F5 Traffix SDC
Publisher:         F5 Networks
Operating System:  Linux variants
                   Network Appliance
Impact/Access:     Denial of Service -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5390  

Reference:         ESB-2018.2278

Original Bulletin: 

Revision History:  August 14 2018: Updated Security Advisory Status product table. 
                   August  8 2018: Initial Release

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K95343321:Linux kernel vulnerability (SegmentSmack) CVE-2018-5390

Security Advisory

Original Publication Date: 07 Aug, 2018

Latest   Publication Date: 14 Aug, 2018

Security Advisory Description

Linux kernel versions 4.9+ can be forced to make very expensive calls to
tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet
which can lead to a denial of service. (CVE-2018-5390)

This vulnerability is also referred as SegmentSmack.


For products with vulnerable versions, this vulnerability allows a remote
attacker to disrupt service.

For products with None in the Versions known to be vulnerable column, there is
no impact.

For products with ** in the various columns, F5 is still researching the issue
and will update this article after confirming the required information. F5
Technical Support has no additional information about this issue.

Security Advisory Status

F5 Product Development has assigned ID CPF-24972 and CPF-24973 (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. 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|          |          |      |          |
|BIG-IP (LTM, AAM, |13.x  |**        |**        |**        |**    |**        |
|AFM, Analytics,   +------+----------+----------+----------+------+----------+
|APM, ASM, DNS,    |12.x  |None      |Not       |          |      |          |
|Edge Gateway, FPS,|      |          |applicable|Not       |      |          |
|GTM, Link         +------+----------+----------+vulnerable|None  |None      |
|Controller, PEM,  |11.x  |None      |Not       |          |      |          |
|WebAccelerator)   |      |          |applicable|          |      |          |
|ARX               |6.x   |None      |Not       |Not       |None  |None      |
|                  |      |          |applicable|vulnerable|      |          |
|Enterprise Manager|3.x   |None      |Not       |Not       |None  |None      |
|                  |      |          |applicable|vulnerable|      |          |
|                  |6.x   |None      |Not       |          |      |          |
|BIG-IQ Centralized|      |          |applicable|Not       |      |          |
|Management        +------+----------+----------+vulnerable|None  |None      |
|                  |5.x   |None      |Not       |          |      |          |
|                  |      |          |applicable|          |      |          |
|BIG-IQ Cloud and  |1.x   |None      |Not       |Not       |None  |None      |
|Orchestration     |      |          |applicable|vulnerable|      |          |
|F5 iWorkflow      |2.x   |None      |Not       |Not       |None  |None      |
|                  |      |          |applicable|vulnerable|      |          |
|                  |5.x   |5.0.0 -   |None      |          |      |          |
|Traffix SDC       |      |5.1.0     |          |High      |7.5   |Linux     |
|                  +------+----------+----------+          |      |kernel    |
|                  |4.x   |4.4.0     |None      |          |      |          |

^1 The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.

** Confirmation of vulnerability or non-vulnerability is not presently
available. F5 is still researching the issue for the products indicated, and
will update this article with the most current information as soon as it has
been confirmed. F5 Technical Support has no additional information on this

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.



Supplemental Information

  o K51812227: Understanding Security Advisory versioning
  o K41942608: Overview of AskF5 Security Advisory articles
  o K4602: Overview of the F5 security vulnerability response policy
  o K4918: Overview of the F5 critical issue hotfix policy
  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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