ESB-2018.3360 - [Appliance] F5 products: Denial of service - Existing account 2018-10-31

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3360
           K28003839: tmsh utility vulnerability CVE-2018-15322
                              31 October 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           F5 products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15322  

Original Bulletin: 
   https://support.f5.com/csp/article/K28003839

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K28003839: tmsh utility vulnerability CVE-2018-15322

Security Advisory

Original Publication Date: Oct 31, 2018

Security Advisory Description

A BIG-IP user granted with tmsh access may cause the BIG-IP system to
experience denial-of-service (DoS) when the BIG-IP user uses the tmsh utility
to run the edit cli preference command and proceeds to save the changes to
another filename repeatedly. This action utilizes storage space on the /var
partition and when performed repeatedly causes the /var partition to be full. (
CVE-2018-15322)

Impact

BIG-IP / BIG-IQ / Enterprise Manager / F5 iWorkflow

The BIG-IP system experiences a denial-of-service (DoS) attack until the
storage space on the /var partition returns to normal. This vulnerability also
applies to a BIG-IP system running in Appliance mode if it is configured to
grant a BIG-IP user with TMOS Shell (tmsh) access.

Traffix SDC

There is no impact; this F5 product is not affected by this vulnerability.

Security Advisory Status

F5 Product Development has assigned ID 705476 (BIG-IP), ID 706479 (BIG-IQ), ID
706478 (Enterprise Manager), and ID 706480 (F5 iWorkflow) 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|          |          |      |           |
+------------------+------+----------+----------+----------+------+-----------+
|                  |14.x  |14.0.0    |14.0.0.3  |          |      |           |
|                  +------+----------+----------+          |      |           |
|BIG-IP (LTM, AAM, |13.x  |13.0.0 -  |13.1.1    |          |      |           |
|AFM, Analytics,   |      |13.1.0    |13.1.0.8  |          |      |           |
|APM, ASM, DNS,    +------+----------+----------+          |      |tmsh       |
|Edge Gateway,     |12.x  |12.1.0 -  |12.1.3.6  |          |      |utility    |
|GTM, Link         |      |12.1.3    |          |Medium    |5.5   |(tmsh edit |
|Controller, PEM,  +------+----------+----------+          |      |cli        |
|WebAccelerator,   |      |11.6.1 -  |          |          |      |preference)|
|WebSafe)          |      |11.6.3    |11.6.3.3  |          |      |           |
|                  |11.x  |11.5.1 -  |11.5.7    |          |      |           |
|                  |      |11.5.6    |          |          |      |           |
|                  |      |11.2.1    |          |          |      |           |
+------------------+------+----------+----------+----------+------+-----------+
|                  |      |          |          |          |      |tmsh       |
|                  |      |          |          |          |      |utility    |
|Enterprise Manager|3.x   |3.1.1     |None      |Medium    |5.5   |(tmsh edit |
|                  |      |          |          |          |      |cli        |
|                  |      |          |          |          |      |preference)|
+------------------+------+----------+----------+----------+------+-----------+
|                  |6.x   |6.0.0 -   |None      |          |      |           |
|                  |      |6.0.1     |          |          |      |tmsh       |
|BIG-IQ Centralized+------+----------+----------+          |      |utility    |
|Management        |5.x   |5.0.0 -   |None      |Medium    |5.5   |(tmsh edit |
|                  |      |5.4.0     |          |          |      |cli        |
|                  +------+----------+----------+          |      |preference)|
|                  |4.x   |4.6.0     |None      |          |      |           |
+------------------+------+----------+----------+----------+------+-----------+
|                  |      |          |          |          |      |tmsh       |
|BIG-IQ Cloud and  |      |          |          |          |      |utility    |
|Orchestration     |1.x   |1.0.0     |None      |Medium    |5.5   |(tmsh edit |
|                  |      |          |          |          |      |cli        |
|                  |      |          |          |          |      |preference)|
+------------------+------+----------+----------+----------+------+-----------+
|                  |      |          |          |          |      |tmsh       |
|                  |      |2.0.1 -   |          |          |      |utility    |
|F5 iWorkflow      |2.x   |2.3.0     |None      |Medium    |5.5   |(tmsh edit |
|                  |      |          |          |          |      |cli        |
|                  |      |          |          |          |      |preference)|
+------------------+------+----------+----------+----------+------+-----------+
|                  |5.x   |None      |Not       |          |      |           |
|                  |      |          |applicable|Not       |      |           |
|Traffix SDC       +------+----------+----------+vulnerable|None  |None       |
|                  |4.x   |None      |Not       |          |      |           |
|                  |      |          |applicable|          |      |           |
+------------------+------+----------+----------+----------+------+-----------+

^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

To mitigate this vulnerability, ensure that only trusted BIG-IP users are
granted tmsh access.

Supplemental Information

  o K51812227: Understanding Security Advisory versioning
  o K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems
  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 K13123: Managing BIG-IP product hotfixes (11.x - 13.x)
  o K15106: Managing BIG-IQ product hotfixes
  o K15113: BIG-IQ hotfix matrix
  o K167: Downloading software and firmware from F5
  o K9970: Subscribing to email notifications regarding F5 products

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