ESB-2018.2156 - [Appliance] F5 BIG-IP products: Denial of service - Remote/unauthenticated 2018-07-25

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

                               ESB-2018.2156
         Final - K12403422: BIG-IP ASM vulnerability CVE-2018-5541
                               25 July 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:        Patch/Upgrade
CVE Names:         CVE-2018-5541  

Original Bulletin: 
   https://support.f5.com/csp/article/K12403422

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Final - K12403422: BIG-IP ASM vulnerability CVE-2018-5541

Security Advisory

Original Publication Date: Jul 25, 2018

The security issue described in this article has been resolved or does not
affect any F5 products. There will be no further updates, unless new
information is discovered.

Security Advisory Description

When the BIG-IP ASM system processes HTTP requests, an unusually large number
of parameters can cause excessive CPU usage in the BIG-IP ASM bd process. (
CVE-2018-5541)

Impact

BIG-IP

When this vulnerability is exploited, the BIG-IP ASM system may experience a
denial of service (DoS). BIG-IP systems that are not provisioned with BIG-IP
ASM are not affected.

BIG-IQ, F5 iWorkflow, Enterprise Manager, ARX, and Traffix SDC

There is no impact; these F5 products are not affected by this vulnerability.

Security Advisory Status

F5 Product Development has assigned ID 672124 (BIG-IP) 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|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |13.x  |13.0.0 -  |13.1.0.2  |          |      |          |
|                   |      |13.1.0    |          |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |12.x  |12.1.0 -  |12.1.3.6  |          |      |          |
|BIG-IP (ASM)       |      |12.1.3    |          |Medium    |5.3   |bd process|
|                   +------+----------+----------+          |      |          |
|                   |      |11.6.1 -  |          |          |      |          |
|                   |11.x  |11.6.3    |11.6.3.2  |          |      |          |
|                   |      |11.5.1 -  |11.5.6    |          |      |          |
|                   |      |11.5.5    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|BIG-IP (LTM, AAM,  |13.x  |None      |Not       |          |      |          |
|AFM, Analytics,    |      |          |applicable|          |      |          |
|APM, DNS, Edge     +------+----------+----------+          |      |          |
|Gateway, FPS, GTM, |12.x  |None      |Not       |Not       |None  |None      |
|Link Controller,   |      |          |applicable|vulnerable|      |          |
|PEM,               +------+----------+----------+          |      |          |
|WebAccelerator)    |11.x  |None      |Not       |          |      |          |
|                   |      |          |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       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IQ Centralized |5.x   |None      |Not       |Not       |None  |None      |
|Management         |      |          |applicable|vulnerable|      |          |
|                   +------+----------+----------+          |      |          |
|                   |4.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

None

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 K13123: Managing BIG-IP product hotfixes (11.x - 13.x)
  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


Contact Support

North America: 1-888-882-7535
Outside North America: 800-11-275-435

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