ESB-2018.3714 - [Appliance] F5 BIG-IP Products: Unauthorised access - Remote/unauthenticated 2018-11-29

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

                               ESB-2018.3714
                      K04463175: SNMPv2 vulnerability
                             29 November 2018

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

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

Product:           F5 BIG-IP Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Unauthorised Access -- Remote/Unauthenticated
Resolution:        Mitigation
CVE Names:         CVE-1999-0517  

Original Bulletin: 
   https://support.f5.com/csp/article/K04463175

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K04463175: SNMPv2 vulnerability CVE-1999-0517

Security Advisory

Original Publication Date: Nov 27, 2018


Security Advisory Description

When the non-default configuration allowing remote SNMPv2 access is set,
attackers may be able to access the BIG-IP system SNMPv2 service using a
guessed community string. (CVE-1999-0517)

Note: This vulnerability does not affect SNMPv3.

Impact

When configured to allow remote SNMP access, attackers may be able to access
SNMPv2 using a guessed community string, allowing SNMP access without
authorization.

Security Advisory Status

F5 Product Development has assigned ID 746117 (BIG-IP), and CPF-25016,
CPF-25017 (Traffix) 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    |None      |          |      |          |
|BIG-IP (LTM, AAM,  +------+----------+----------+          |      |          |
|AFM, Analytics,    |13.x  |13.0.0 -  |None      |          |      |          |
|APM, ASM, DNS, Edge|      |13.1.1    |          |          |      |          |
|Gateway, FPS, GTM, +------+----------+----------+Medium    |5.3   |SNMP      |
|Link Controller,   |12.x  |12.1.0 -  |None      |          |      |          |
|PEM,               |      |12.1.3    |          |          |      |          |
|WebAccelerator)    +------+----------+----------+          |      |          |
|                   |11.x  |11.5.1 -  |None      |          |      |          |
|                   |      |11.6.3    |          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x   |3.1.1     |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   |5.0.0 -   |None      |          |      |          |
|Traffix SDC        |      |5.1.0     |          | Medium   |5.9   |SNMP      |
|                   +------+----------+----------+          |      |          |
|                   |4.x   |4.4.0     |None      |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+

^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

If you are not using SNMP, you should prevent SNMP access from all hosts,
including localhost, as described in K13535: Restricting SNMP access to the
BIG-IP system.

If you are using SNMPv2, you can install agent access rules with a community
string other than public and restrict SNMP access from remote addresses. To do
so, perform the following procedure:

Impact of workaround: Performing the following procedure should not have a
negative impact on your system.

 1. Log in to the BIG-IP Configuration utility.
 2. Click System.
 3. Navigate to the SNMP > Agent > Access (v1, v2c).
 4. Select the public:default check box.
 5. Click Delete.
 6. Confirm by clicking Delete again.
 7. Click Create.
 8. Enter a new community string of your choice.
 9. Select a new source of default.
10. Click Finished.

Note: SNMP clients will need to use the new community string to access SNMP
data on the BIG-IP host.

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

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