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AUSCERT External Security Bulletin Redistribution
ESB-2019.4768.2
TMOS Shell vulnerability CVE-2019-19151
2 July 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Unauthorised Access -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-19151
Original Bulletin:
https://support.f5.com/csp/article/K21711352
Revision History: July 2 2020: Vendor released minor update
December 23 2019: Initial Release
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K21711352:TMOS Shell vulnerability CVE-2019-19151
Security Advisory
Original Publication Date: 21 Dec, 2019
Latest Publication Date: 02 Jul, 2020
Security Advisory Description
Authenticated users granted TMOS Shell (tmsh) privileges can access objects on
the file system, which would normally be disallowed by tmsh restrictions. This
allows for authenticated, low privileged attackers to access objects on the
file system, which would not normally be allowed. (CVE-2019-19151)
Note: This vulnerability exists because of an incomplete fix for CVE-2018-5516.
Impact
This vulnerability allows unauthorized privileges to authenticated
administrative users with TMOS Shell (tmsh) access.
Security Advisory Status
F5 Product Development has assigned ID 746091 (BIG-IP), ID 709043 (BIG-IQ), and
ID 345678 (Enterprise Manager) 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 - |None | | | |
| | |15.1.0 | | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.0.0 - |14.1.2.4 | | | |
|AFM, Analytics, | |14.1.2 | | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | | |
|Gateway, FPS, GTM, |13.x |13.0.0 - |13.1.3.4 |Low |3.1 |tmsh |
|Link Controller, | |13.1.3 | | | | |
|PEM, +------+----------+----------+ | | |
|WebAccelerator) |12.x |12.1.0 - |12.1.5.2 | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |3.1.1 |None |Low |3.1 |tmsh |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |7.0.0 |None | | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |6.0.0 - |None | | | |
|Management | |6.1.0 | |Low |3.1 |tmsh |
| +------+----------+----------+ | | |
| |5.x |5.0.0 - |None | | | |
| | |5.4.0 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |2.3.0 |None |Low |3.1 |tmsh |
+-------------------+------+----------+----------+----------+------+----------+
| |5.x |None |Not | | | |
| | | |applicable|Not | | |
|Traffix SDC +------+----------+----------+vulnerable|None |None |
| |4.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
^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
There is no mitigation for this vulnerability. However, administrative users
that have only Configuration utility permissions cannot exploit this
vulnerability.
Acknowledgements
F5 would like to acknowledge Rich Mirch for bringing this issue to our
attention and following the highest standards of responsible disclosure.
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 K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
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 K37442533: TMOS Shell vulnerability CVE-2018-5516
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