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AUSCERT External Security Bulletin Redistribution
ESB-2018.3220.4
K20934447: Linux kernel vulnerability CVE-2018-14634
12 August 2019
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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-2018-14634
Reference: ESB-2018.3166
ESB-2018.3140
ESB-2018.3130
ESB-2018.3054
Original Bulletin:
https://support.f5.com/csp/article/K20934447
Revision History: August 12 2019: Vendor updated with more detail on
vulnerable & fixed versions
July 3 2019: Vendor updated vulnerable and fixed
version details
March 27 2019: Updated with latest publication
October 23 2018: Initial Release
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K20934447:Linux kernel vulnerability CVE-2018-14634
Security Advisory
Original Publication Date: 23 Oct, 2018
Latest Publication Date: 10 Aug, 2019
Security Advisory Description
An integer overflow flaw was found in the Linux kernel's create_elf_tables()
function. An unprivileged local user with access to SUID (or otherwise
privileged) binary could use this flaw to escalate their privileges on the
system. Kernel versions 2.6.x, 3.10.x and 4.14.x are believed to be vulnerable.
(CVE-2018-14634)
Impact
The default, standard, and recommended configuration for the BIG-IP
configuration is to allow only root user access to the CLI. Therefore, local
privilege escalations are mitigated by default. Any unprivileged local user may
acquire elevated privileges.
Security Advisory Status
F5 Product Development has assigned ID 745257 (BIG-IP), ID 747107 (BIG-IQ), ID
747345 (iWorkflow), CPF-24995 and CPF-24996 (Traffix), and ID 747344
(Enterprise Manager) to this vulnerability. Additionally, F5 iHealth may list
Heuristic H20934447 on the Diagnostics > Identified > Medium page.
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 |None |15.0.0 | | | |
| +------+----------+----------+ | | |
| |14.x |14.0.0 - |14.1.0.6 | | | |
|BIG-IP (LTM, AAM, | |14.1.0 | | | | |
|AFM, Analytics, APM, +------+----------+----------+ | | |
|ASM, DNS, Edge |13.x |13.0.0 - |13.1.1.5 | | |Linux |
|Gateway, FPS, GTM, | |13.1.1 | |Medium |6.4 |kernel |
|Link Controller, PEM,+------+----------+----------+ | | |
|WebAccelerator) |12.x |12.1.0 - |12.1.5 | | | |
| | |12.1.4 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.2.1 - |11.6.4 | | | |
| | |11.6.3 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
|Enterprise Manager |3.x |3.1.1 |None |Medium |6.4 |Linux |
| | | | | | |kernel |
+---------------------+------+----------+----------+--------+------+----------+
| |6.x |6.0.0 - |None | | | |
| | |6.0.1 | | | | |
|BIG-IQ Centralized +------+----------+----------+ | |Linux |
|Management |5.x |5.0.0 - |None |Medium |6.4 |kernel |
| | |5.4.0 | | | | |
| +------+----------+----------+ | | |
| |4.x |4.6.0 |None | | | |
+---------------------+------+----------+----------+--------+------+----------+
|BIG-IQ Cloud and |1.x |1.0.0 |None |Medium |6.4 |Linux |
|Orchestration | | | | | |kernel |
+---------------------+------+----------+----------+--------+------+----------+
|F5 iWorkflow |2.x |2.2.0 - |None |Medium |6.4 |Linux |
| | |2.3.0 | | | |kernel |
+---------------------+------+----------+----------+--------+------+----------+
| |5.x |5.0.0 - |None | | | |
|Traffix SDC | |5.1.0 | |High |7.8 |Linux |
| +------+----------+----------+ | |kernel |
| |4.x |4.4.0 |None | | | |
+---------------------+------+----------+----------+--------+------+----------+
^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
Limit access to the Advanced Shell (bash) to trusted users only.
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