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AUSCERT External Security Bulletin Redistribution
ESB-2019.2329.4
K40378764:F5 tmsh vulnerability CVE-2019-6642
28 November 2019
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Root Compromise -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2019-6642
Original Bulletin:
https://support.f5.com/csp/article/K40378764
Revision History: November 28 2019: v15.x branch now fixed with 15.0.1.1
September 25 2019: Updated affected versions including
a fix for the 14.x branch
August 12 2019: Vendor advises that fixes are available
for some versions
June 28 2019: Initial Release
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K40378764: F5 tmsh vulnerability CVE-2019-6642
Original Publication Date: 28 Jun, 2019
Latest Publication Date: 27 Nov, 2019
Security Advisory Description
Authenticated users with the ability to upload files (via scp, for example) can
escalate their privileges to allow root shell access from within the TMOS Shell
(tmsh) interface. The tmsh interface allows users to execute a secondary
program via tools like sftp or scp. (CVE-2019-6642)
Impact
BIG-IP, BIG-IQ, F5 iWorkflow, and Enterprise Manager
The affected systems are incidentally protected against direct access to the
Advanced Shell (bash); however, users who can upload an executable file (or
script) can bypass this protection.
Traffix SDC
There is no impact for this product as it is not affected by this
vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 771873 (BIG-IP) and ID 772713 (BIG-IQ,
F5 iWorkflow, and 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 - |15.0.1.1 | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.0.0 - |14.1.2.1 | | | |
|AFM, Analytics, | |14.1.2 |14.0.1.1 | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | | |
|Gateway, FPS, GTM, |13.x |13.0.0 - |13.1.3 |High |7.8 |tmsh bash |
|Link Controller, | |13.1.2 | | | | |
|PEM, +------+----------+----------+ | | |
|WebAccelerator) |12.x |12.1.0 - |12.1.5 | | | |
| | |12.1.4 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |11.6.5.1 | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |3.1.1 |None |High |7.8 |tmsh bash |
+-------------------+------+----------+----------+----------+------+----------+
| |6.x |6.0.0 - |None | | | |
|BIG-IQ Centralized | |6.1.0 | | | | |
|Management +------+----------+----------+High |7.8 |tmsh bash |
| |5.x |5.1.0 - |None | | | |
| | |5.4.0 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |2.3.0 |None |High |7.8 |tmsh bash |
+-------------------+------+----------+----------+----------+------+----------+
|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 disable the TMOS Shell (tmsh) access on
all user accounts associated with the Resource Administrator role. For more
information about disabling tmsh access, refer to K12029: Accessing the TMOS
Shell.
Acknowledgements
F5 would like to acknowledge Lukasz Juszczyk and Robert Podsiadlo of ING Tech
Poland for bringing this issue to our attention, and for following the highest
standards of responsible disclosure.
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