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             AUSCERT External Security Bulletin Redistribution

     Reflected Cross-Site Scripting (XSS) vulnerability CVE-2018-15312
                              24 October 2018


        AusCERT Security Bulletin Summary

Product:           F5 BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15312  

Original Bulletin: 

Revision History:  October 24 2018: Security Advisory Status section updated 
                                    with BIG-IP Health heuristics information
                   October 18 2018: Initial Release

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K44462254: Reflected Cross-Site Scripting (XSS) vulnerability CVE-2018-15312

Security Advisory

Original Publication Date: Oct 18, 2018
Updated Date: Oct 23, 2018

Security Advisory Description

A reflected Cross-Site Scripting (XSS) vulnerability exists in an undisclosed
page of the BIG-IP Configuration utility that allows an attacker to execute
JavaScript in the context of the current logged-in user. (CVE-2018-15312)


A remote unauthenticated attacker could potentially exploit this vulnerability
by sending a specific crafted URL that includes the specific target host name
and malicious HTML or JavaScript code to a BIG-IP Configuration utility user,
which is then reflected back to the victim and executed by the web browser. If
the exploit is successful, an attacker can run JavaScript in the context of the
currently logged-in user. In the case of an administrative user with Advanced
Shell (bash) access, successful exploitation of this vulnerability can be
leveraged to completely compromise the BIG-IP system through Remote Code

Security Advisory Status

F5 Product Development has assigned ID 726089 (BIG-IP) to this vulnerability.
Additionally, BIG-IP iHealth may list Heuristic H44462254 on the Diagnostics >
Identified > High page.

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 or |
|                |      |be        |in        |          |1     |feature      |
|                |      |vulnerable|          |          |      |             |
|                |14.x  |None      |14.0.0    |          |      |             |
|BIG-IP (LTM,    +------+----------+----------+          |      |             |
|AAM, AFM,       |13.x  |13.0.0 -  |  |          |      |             |
|Analytics, APM, |      |13.1.1    |          |          |      |             |
|ASM, DNS, Edge  +------+----------+----------+High      |7.5   |Configuration|
|Gateway, FPS,   |12.x  |12.1.0 -  |  |          |      |utility      |
|GTM, Link       |      |12.1.3    |          |          |      |             |
|Controller, PEM,+------+----------+----------+          |      |             |
|WebAccelerator) |11.x  |None      |Not       |          |      |             |
|                |      |          |applicable|          |      |             |
|Enterprise      |3.x   |None      |Not       |Not       |None  |None         |
|Manager         |      |          |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.


To mitigate this vulnerability for affected F5 products, you should permit
management access to F5 products only over a secure network and limit shell
access to only trusted users. For more information about securing access to
BIG-IP and Enterprise Manager systems, refer to K13309: Restricting access to
the Configuration utility by source IP address (11.x - 14.x) and K13092:
Overview of securing access to the BIG-IP system.

In testing this vulnerability, F5 has determined that Chrome Cross-site (XSS)
Auditor and Internet Explorer Anti Cross-site (XSS) features block this attack,
by default. However, the Firefox browser plug-in NoScript alerts the user, but
allows them to continue. The BIG-IP Content Security Policy (CSP) does not
prevent the attack from occurring, but does limit the code that can be run for
browsers that support CSP.

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 K167: Downloading software and firmware from F5

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