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AUSCERT External Security Bulletin Redistribution
ESB-2018.2467
K74374841:Linux kernel vulnerability (FragmentSmack) CVE-2018-5391
21 August 2018
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2018-5391
Reference: ESB-2018.2401
ESB-2018.2358
ESB-2018.2348.3
ESB-2018.2342
Original Bulletin:
https://support.f5.com/csp/article/K74374841
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K74374841:Linux kernel vulnerability (FragmentSmack) CVE-2018-5391
Security Advisory
Original Publication Date: 21 Aug, 2018
Security Advisory Description
** RESERVED ** This candidate has been reserved by an organization or
individual that will use it when announcing a new security problem. When the
candidate has been publicized, the details for this candidate will be
provided. (CVE-2018-5391 also known as FragmentSmack)
Impact
For products with vulnerable versions, this vulnerability allows a remote
attacker to disrupt service. This vulnerability affects only the BIG-IP
management port.
For products with None in the Versions known to be vulnerable column, there is
no impact.
Security Advisory Status
F5 Product Development has assigned ID 739971 (BIG-IP) to this vulnerability.
For products with ** in the various columns, F5 Product Development is aware
of this vulnerability and is investigating the currently supported releases
for potential 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| | | | |
+-----------------+------+----------+----------+----------+------+-----------+
| |14.x |14.0.0 |None | | |Linux |
|BIG-IP (LTM, AAM,+------+----------+----------+High |7.5 |Kernel |
|AFM, Analytics, |13.x |13.0.0 - |None | | |(management|
|APM, ASM, DNS, | |13.1.1 | | | |port) |
|Edge Gateway, +------+----------+----------+----------+------+-----------+
|FPS, GTM, Link |12.x |None |Not | | | |
|Controller, PEM, | | |Applicable|Not | | |
|WebAccelerator) +------+----------+----------+vulnerable|None |None |
| |11.x |None |Not | | | |
| | | |Applicable| | | |
+-----------------+------+----------+----------+----------+------+-----------+
|ARX |6.x |None |Not |Not |None |None |
| | | |Applicable|vulnerable| | |
+-----------------+------+----------+----------+----------+------+-----------+
|Enterprise |3.x |None |Not |Not |None |None |
|Manager | | |Applicable|vulnerable| | |
+-----------------+------+----------+----------+----------+------+-----------+
| |6.x |None |Not | | | |
|BIG-IQ | | |Applicable|Not | | |
|Centralized +------+----------+----------+vulnerable|None |None |
|Management |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 |None |Not | | | |
| | | |applicable|Not | | |
|Traffix SDC +------+----------+----------+vulnerable|None |None |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+-----------------+------+----------+----------+----------+------+-----------+
^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.
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
To mitigate this vulnerability, you should permit management access to F5
products only over a secure network and restrict command line access for
affected systems to trusted users. For more information, refer to K13309:
Restricting access to the Configuration utility by source IP address (11.x -
13.x) and K13092: Overview of securing access to the BIG-IP system.
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
o K95343321: Linux kernel vulnerability (SegmentSmack) CVE-2018-5390
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