ESB-2018.3357 - [Appliance] F5 BIG-IP products: Denial of service - Remote/unauthenticated 2018-10-31

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

                               ESB-2018.3357
                K64208870: TMM vulnerability CVE-2018-15319
                              31 October 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-2018-15319  

Original Bulletin: 
   https://support.f5.com/csp/article/K64208870

- --------------------------BEGIN INCLUDED TEXT--------------------

K64208870: TMM vulnerability CVE-2018-15319

Security Advisory

Original Publication Date: Oct 31, 2018

Security Advisory Description

Malicious requests made to virtual servers with an HTTP profile can cause the
TMM to restart. The issue is exposed with the non-default "normalize URI"
configuration options used in iRules and/or BIG-IP LTM policies. (
CVE-2018-15319)

Impact

An attacker may be able to disrupt traffic or cause the BIG-IP system to fail
over to another device in the device group. This vulnerability affects systems
with any of the following configurations:

  o A virtual server associated with an HTTP profile and a local traffic policy
    that has a rule condition with the HTTP URI and Use normalized URI options
    enabled (the Use normalized URI option is disabled by default).
  o For example, in the following configuration excerpt, the local traffic
    policy is vulnerable:

    ltm policy /Common/K64208870 {

        requires { http }
        rules {
            vulnerable {
                conditions {
                    0 {
                        http-uri
                        path
                        normalized
                        values { /exploitable }
                    }
                }
            }
        }
        strategy /Common/first-match
    }

  o A virtual server associated with an HTTP profile and an iRule using any of
    the following iRules commands with the -normalized switch:
      - HTTP::uri
      - HTTP::query
      - HTTP::path

    For example:

    when HTTP_REQUEST {
         if { ([HTTP::uri -normalized] starts_with "/exploitable")} {
              log local0.error "K64208870 URI example"
         } elseif { ([HTTP::query -normalized] starts_with "/exploitable")} {
              log local0.error "K64208870 Query example"
         } elseif { ([HTTP::path -normalized] starts_with "/exploitable")} {
              log local0.error "K64208870 Path example"
         }
    }

Security Advisory Status

F5 Product Development has assigned ID 722091 (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|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |14.x  |14.0.0    |14.0.0.3  |          |      |          |
|BIG-IP (LTM, AAM,  +------+----------+----------+          |      |          |
|AFM, Analytics,    |13.x  |13.0.0 -  |13.1.1.2  |          |      |          |
|APM, ASM, DNS, Edge|      |13.1.1    |          |          |      |          |
|Gateway, FPS, GTM, +------+----------+----------+High      |7.5   |TMM       |
|Link Controller,   |12.x  |12.1.0 -  |12.1.3.7  |          |      |          |
|PEM,               |      |12.1.3    |          |          |      |          |
|WebAccelerator)    +------+----------+----------+          |      |          |
|                   |11.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|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

To mitigate this vulnerability, you should avoid using the following options:

  o The normalize option with L7 policies.
  o The -normalize option with HTTP::uri, HTTP::query, or HTTP::path iRules
    commands.

Impact of action: The impact of the suggested mitigation depends on the
specific environment. F5 recommends that you test any such changes during a
maintenance window and  consider the possible impact on your specific
environment.

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 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
  o K9957: Creating a custom RSS feed to view new and updated documents
  o K21232150: Considerations for upgrading BIG-IQ or F5 iWorkflow systems

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