ESB-2018.1355 - [Appliance] F5 BIG-IP products: Access confidential data - Existing account 2018-05-03

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

                               ESB-2018.1355
                 Appliance mode tmsh access vulnerability
                                3 May 2018

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

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

Product:           F5 BIG-IP products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-5520  

Original Bulletin: 
   https://support.f5.com/csp/article/K02043709

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K02043709: Appliance mode tmsh access vulnerability CVE-2018-5520

Security Advisory

Original Publication Date: May 01, 2018

Security Advisory Description

On a BIG-IP system configured in Appliance mode, the TMOS Shell (tmsh) may
allow an administrative user to use the dig utility to gain unauthorized access
to file system resources. (CVE-2018-5520)

Note: Appliance mode is designed to meet the needs of customers in especially
sensitive sectors by limiting the BIG-IP system administrative access to match
that of a typical network appliance and not a multi-user UNIX device. When a
BIG-IP system is configured in Appliance mode, the Advanced Shell (bash) access
to the file system is restricted. For information about Appliance mode, refer
to K12815: Overview of Appliance mode.

Impact

This vulnerability allows unauthorized disclosure of information.

Security Advisory Status

F5 Product Development has assigned ID 688011 (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.

+----------------+------+----------+----------+----------+------+-------------+
|                |      |Versions  |Fixes     |          |CVSSv3|Vulnerable   |
|Product         |Branch|known to  |introduced|Severity  |score^|component or |
|                |      |be        |in        |          |1     |feature      |
|                |      |vulnerable|          |          |      |             |
+----------------+------+----------+----------+----------+------+-------------+
|                |      |13.0.0 -  |          |          |      |             |
|BIG-IP (LTM,    |13.x  |13.1.0    |13.1.0.6  |          |      |The dig      |
|AAM, AFM,       |      |          |          |          |      |utility when |
|Analytics, APM, +------+----------+----------+          |      |executed from|
|ASM, DNS, Edge  |      |12.1.0 -  |          |          |      |tmsh on a    |
|Gateway,        |12.x  |12.1.3    |12.1.3.2  |Medium    |4.4   |BIG-IP system|
|GTM, Link       |      |          |          |          |      |configured   |
|Controller, PEM,+------+----------+----------+          |      |for Appliance|
|WebAccelerator, |      |11.2.1 -  |          |          |      |mode         |
|WebSafe)        |11.x  |11.6.3    |None      |          |      |             |
|                |      |          |          |          |      |             |
+----------------+------+----------+----------+----------+------+-------------+
|ARX             |6.x   |None      |Not       |Not       |None  |None         |
|                |      |          |applicable|vulnerable|      |             |
+----------------+------+----------+----------+----------+------+-------------+
|Enterprise      |3.x   |None      |Not       |Not       |None  |None         |
|Manager         |      |          |applicable|vulnerable|      |             |
+----------------+------+----------+----------+----------+------+-------------+
|                |5.x   |None      |Not       |          |      |             |
|BIG-IQ          |      |          |applicable|Not       |      |             |
|Centralized     +------+----------+----------+vulnerable|None  |None         |
|Management      |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|      |             |
+----------------+------+----------+----------+----------+------+-------------+
|LineRate        |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|          |      |             |
+----------------+------+----------+----------+----------+------+-------------+

^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.

Note: For details about how Security Advisory articles are versioned, and what
versions are listed in the table, refer to K51812227: Understanding Security
Advisory versioning.

Mitigation

None

Acknowledgements

F5 would like to acknowledge Carlo Beccaria for bringing this issue to our
attention and for following the highest standards of responsible disclosure.

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

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