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AUSCERT External Security Bulletin Redistribution
ESB-2019.4763.2
F5 iRules vulnerability CVE-2019-6685
11 February 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Modify Permissions -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-6685
Original Bulletin:
https://support.f5.com/csp/article/K30215839
Revision History: February 11 2020: Updated Security Advisory Status table
December 23 2019: Initial Release
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K30215839:F5 iRules vulnerability CVE-2019-6685
Security Advisory
Original Publication Date: 21 Dec, 2019
Latest Publication Date: 10 Feb, 2020
Security Advisory Description
Users with access to edit iRules are able to create iRules which can lead to an
elevation of privilege, configuration modification, and arbitrary system
command execution. (CVE-2019-6685)
Impact
BIG-IP
iRules manager roles are able to access data stored on other administrative
partitions when the access privilege is elevated.
BIG-IQ, Enterprise Manager, and Traffix SDC
There is no impact on these F5 products because they are not affected by this
vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 782529 (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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |15.x |15.0.0 - |15.1.0 | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
| | |14.1.0 - | | | | |
|BIG-IP (LTM, AAM, |14.x |14.1.2 |14.1.2.3 | | | |
|AFM, Analytics, | |14.0.0 - |14.0.1.1 | | | |
|APM, ASM, DNS, Edge| |14.0.1 | | | | |
|Gateway, FPS, GTM, +------+----------+----------+Medium |6.7 |iRules |
|Link Controller, |13.x |13.1.0 - |13.1.3.2 | | | |
|PEM, | |13.1.3 | | | | |
|WebAccelerator) +------+----------+----------+ | | |
| |12.x |12.1.0 - |12.1.5.1 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |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 reduce the privileges of roles such as
iRules Manager because more highly privileged roles, such as the Resource
Administrator role, already have access privileges. If possible, remove the
iRules Manager role from use to mitigate the attack.
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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