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AUSCERT External Security Bulletin Redistribution
ESB-2021.1454
Resource Administrator or Administrator role authenticated
local command execution vulnerability CVE-2021-23012
29 April 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-23012
Original Bulletin:
https://support.f5.com/csp/article/K04234247
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K04234247: Resource Administrator or Administrator role authenticated local
command execution vulnerability CVE-2021-23012
Original Publication Date: 29 Apr, 2021
Security Advisory Description
Lack of input validation for items used in system support functionality may
allow users granted either "Resource Administrator" or "Administrator" roles to
execute arbitrary bash commands on BIG-IP. (CVE-2021-23012)
Impact
In a standard BIG-IP deployment, a minor privilege escalation may be created
when executed as the Resource Administrator. In an Appliance Mode deployment
scenario this may allow for the aforementioned roles to execute shell commands
to escape the Appliance Mode sandbox.
Security Advisory Status
F5 Product Development has assigned ID 877109 (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.
Note: After a fix is introduced for a given minor branch, that fix applies to
all subsequent maintenance and point releases for that branch, and no
additional fixes for that branch will be listed in the table. For example, when
a fix is introduced in 14.1.2.3, the fix also applies to 14.1.2.4, and all
later 14.1.x releases (14.1.3.x., 14.1.4.x). For more information, refer to
K51812227: Understanding security advisory versioning. Additionally, software
versions preceding those listed in the following table have reached the End of
Technical Support (EoTS) phase of their lifecycle and are no longer evaluated
for security issues. For more information, refer to the Security hotfixes
section of K4602: Overview of the F5 security vulnerability response policy.
+------------+------+-------------+----------+-----------+------+-------------+
| | |Versions |Fixes | |CVSSv3|Vulnerable |
|Product |Branch|known to be |introduced|Severity |score^|component or |
| | |vulnerable^1 |in | |2 |feature |
+------------+------+-------------+----------+-----------+------+-------------+
| |16.x |16.0.0 - |16.0.1.1 | | | |
| | |16.0.1 | | | | |
| +------+-------------+----------+ | | |
| |15.x |15.0.0 - |15.1.3 | | | |
| | |15.1.2 | | | | |
| +------+-------------+----------+Medium | | |
| |14.x |14.1.0 - |14.1.4 | |6.0 | |
|BIG-IP (all | |14.1.3 | |-- | |System |
|modules) +------+-------------+----------+ |-- |support |
| |13.x |13.1.0 - |13.1.4 |High - | |functions |
| | |13.1.3 | |Appliance |7.9^3 | |
| +------+-------------+----------+Mode Only^3| | |
| |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 | | |
+------------+------+-------------+----------+-----------+------+-------------+
^1F5 evaluates only software versions that have not yet reached the End of
Technical Support (EToS) phase of their lifecycle.
^2The CVSSv3 score link takes you to a resource outside of AskF5, and it is
possible that the document may be removed without our knowledge.
^3The limited number of customers using Appliance Mode will have Scope:
Changed, which raises the CVSSv3 score to 7.9. For information on Appliance
mode, refer to: K12815: Overview of Appliance mode.
Recommended Actions
If you are running a version listed in the Versions known to be vulnerable
column, you can eliminate this vulnerability by installing a version listed in
the Fixes introduced in column. If the Fixes introduced in column does not list
a version for your branch, then no update candidate currently exists for that
branch and F5 recommends upgrading to a version with the fix (refer to the
table).
If the Fixes introduced in column lists a version prior to the one you are
running, in the same branch, then your version should have the fix.
Mitigation
F5 suggests that you audit users assigned the Resource Administrator and
Administrator roles in any installations and limit the number of users assigned
that role. As the vulnerability is exposed only to users assigned the Resource
Administrator and Administrator roles, consider reducing privileges.
For more information, refer to K13092: Overview of securing access to the
BIG-IP system.
Acknowledgements
This issue was discovered internally by F5.
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 K8986: F5 software lifecycle policy
o K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
o K48955220: Installing an OPSWAT Endpoint Security update on BIG-IP APM
systems (11.4.x and later)
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
o K12815: Overview of Appliance mode
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