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

                               ESB-2020.3037
                     SNMP vulnerability CVE-2019-20892
                             4 September 2020

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

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

Product:           F5 BIG-IP Products
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Mitigation
CVE Names:         CVE-2019-20892  

Original Bulletin: 
   https://support.f5.com/csp/article/K45212738

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K45212738:SNMP vulnerability CVE-2019-20892

Security Advisory

Original Publication Date: 04 Sep, 2020

Security Advisory Description

net-snmp before 5.8.1.pre1 has a double free in usm_free_usmStateReference in
snmplib/snmpusm.c via an SNMPv3 GetBulk request. NOTE: this affects net-snmp
packages shipped to end users by multiple Linux distributions, but might not
affect an upstream release. (CVE-2019-20892)

Impact

When exploited, this vulnerability may cause the SNMP process to restart,
leading to a disruption in SNMP services.

Security Advisory Status

F5 Product Development has assigned ID 924961 (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, point 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|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |16.x  |16.0.0    |None      |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |15.x  |15.1.0    |None      |          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IP (LTM, AAM,  |14.x  |None      |Not       |          |      |          |
|Advanced WAF, AFM, |      |          |applicable|          |      |          |
|Analytics, APM,    +------+----------+----------+          |      |          |
|ASM, DDHD, DNS,    |13.x  |None      |Not       |Medium    |6.5   |SNMP      |
|FPS, GTM, Link     |      |          |applicable|          |      |          |
|Controller, PEM,   +------+----------+----------+          |      |          |
|SSLO)              |12.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |7.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|BIG-IQ Centralized |6.x   |None      |Not       |Not       |None  |None      |
|Management         |      |          |applicable|vulnerable|      |          |
|                   +------+----------+----------+          |      |          |
|                   |5.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC        |5.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+

^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.

Mitigation

To mitigate this vulnerability, you can configure SNMPv3 to restrict access
with a password, and to only trusted IP addresses. To do so, refer to K13535:
Restricting SNMP access to the BIG-IP system.

Supplemental Information

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 - 16.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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