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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.2116
                 Linux kernel vulnerability CVE-2019-11811
                               14 June 2021

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

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

Product:           BIG-IP
                   Enterprise Manager
                   BIG-IQ Centralized Management
                   F5 iWorkflow
                   Traffix SDC
Publisher:         F5 Networks
Operating System:  Network Appliance
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2019-11811  

Reference:         ESB-2020.0068
                   ESB-2019.4546
                   ESB-2019.4193
                   ESB-2019.3590

Original Bulletin: 
   https://support.f5.com/csp/article/K01512680

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

K01512680: Linux kernel vulnerability CVE-2019-11811

Original Publication Date: 09 Jul, 2019
Latest   Publication Date: 09 Jun, 2021

Security Advisory Description

An issue was discovered in the Linux kernel before 5.0.4. There is a
use-after-free upon attempted read access to /proc/ioports after the ipmi_si
module is removed, related to drivers/char/ipmi/ipmi_si_intf.c, drivers/char/
ipmi/ipmi_si_mem_io.c, and drivers/char/ipmi/ipmi_si_port_io.c. (CVE-2019-11811)

Impact

An attacker, with local access to read /proc/ioports, may be able to create a
use-after-free condition when the kernel module is unloaded, which may result
in privilege escalation.

Security Advisory Status

F5 Product Development has assigned ID 797797 (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|          |          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |15.x  |15.0.0    |None      |          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |14.x  |14.0.0 -  |14.1.4.3  |          |      |          |
|BIG-IP (LTM, AAM,  |      |14.1.4    |          |          |      |          |
|AFM, Analytics,    +------+----------+----------+          |      |          |
|APM, ASM, DNS, Edge|13.x  |13.1.0 -  |None      |          |      |Linux     |
|Gateway, FPS, GTM, |      |13.1.1    |          |Medium    |6.5   |kernel    |
|Link Controller,   +------+----------+----------+          |      |          |
|PEM,               |12.x  |None      |Not       |          |      |          |
|WebAccelerator)    |      |          |applicable|          |      |          |
|                   +------+----------+----------+          |      |          |
|                   |11.x  |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+
|                   |6.x   |None      |Not       |          |      |          |
|BIG-IQ Centralized |      |          |applicable|Not       |      |          |
|Management         +------+----------+----------+vulnerable|None  |None      |
|                   |5.x   |None      |Not       |          |      |          |
|                   |      |          |applicable|          |      |          |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow       |2.x   |None      |Not       |Not       |None  |None      |
|                   |      |          |applicable|vulnerable|      |          |
+-------------------+------+----------+----------+----------+------+----------+
|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.

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 permit management access to F5
products only over a secure network and restrict command line access for
affected systems to trusted users. For more information, 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.

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 - 15.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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