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AUSCERT External Security Bulletin Redistribution
ESB-2019.2284
A vulnerability in vim and neovim affects multiple F5 products
25 June 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2019-12735
Original Bulletin:
https://support.f5.com/csp/article/K93144355
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K93144355: Vim / Neovim vulnerability CVE-2019-12735
Security Advisory
Original Publication Date: Jun 25, 2019
Security Advisory Description
getchar.c in Vim before 8.1.1365 and Neovim before 0.3.6 allows remote
attackers to execute arbitrary OS commands via the :source! command in a
modeline, as demonstrated by execute in Vim, and assert_fails or nvim_input in
Neovim. (CVE-2019-12735)
Impact
This vulnerability allows a remote attacker to run arbitrary commands.
Security Advisory Status
F5 Product Development has assigned ID 795993 (BIG-IP), ID 796089 (BIG-IQ),
ID 796101 (F5 iWorkflow), ID 796097 (Enterprise Manager), and IDs CPF-25103 and
CPF-25104 (Traffix SDC) 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 - |None | | | |
|BIG-IP (LTM, AAM, | |14.1.0 | | | | |
|AFM, Analytics, APM, +------+----------+----------+ | | |
|ASM, DNS, Edge |13.x |13.1.0 - |None | | | |
|Gateway, FPS, GTM, | |13.1.1 | |Medium |4.3 |Vim |
|Link Controller, PEM,+------+----------+----------+ | | |
|WebAccelerator) |12.x |12.1.0 - |None | | | |
| | |12.1.4 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.2 - |None | | | |
| | |11.6.4 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
|Enterprise Manager |3.x |3.1.1 |Not |Medium |4.3 |Vim |
| | | |applicable| | | |
+---------------------+------+----------+----------+--------+------+----------+
| |6.x |6.0.0 - |None | | | |
|BIG-IQ Centralized | |6.1.0 | | | | |
|Management +------+----------+----------+Medium |4.3 |Vim |
| |5.x |5.1.0 - |None | | | |
| | |5.4.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
|F5 iWorkflow |2.x |2.3.0 |None |Medium |4.3 |Vim |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |5.0.0 - |None |Medium |6.3 |Vim |
| | |5.1.0 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
^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 should ensure that modeline is not enabled
in the vim utility; the modeline option is disabled by default.
To view the current modeline setting, type the following command from the vim
utility:
:set modeline=
If modeline is disabled, the output of the command is as follows:
nomodeline
If modeline is enabled, the output of the command is as follows:
modeline
To disable modeline, type the following command from the vim utility:
:set nomodeline
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 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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