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AUSCERT External Security Bulletin Redistribution
ESB-2019.4498
Linux kernel vulnerability CVE-2018-17972
28 November 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP products
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2018-17972
Reference: ESB-2019.2285
ESB-2018.3577
Original Bulletin:
https://support.f5.com/csp/article/K27673650
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K27673650: Linux kernel vulnerability CVE-2018-17972
Security Advisory
Original Publication Date: 13 Feb, 2019
Latest Publication Date: 27 Nov, 2019
Security Advisory Description
An issue was discovered in the proc_pid_stack function in fs/proc/base.c in the
Linux kernel through 4.18.11. It does not ensure that only root may inspect the
kernel stack of an arbitrary task, allowing a local attacker to exploit racy
stack unwinding and leak kernel task stack contents. (CVE-2018-17972)
Impact
BIG-IP and Traffix SDC
Local attackers can exploit this vulnerability to obtain sensitive information
from the affected system.
BIG-IQ, Enterprise Manager, and F5 iWorkflow
There is no impact on these F5 products; they are not affected by this
vulnerability.
Security Advisory Status
F5 Product Development has assigned ID 756571 (BIG-IP), and ID CPF-25052 and
CPF-25053 (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 - |15.0.1.1 | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.0.0 - |None | | | |
|AFM, Analytics, | |14.1.2 | | | | |
|APM, ASM, DNS, +------+----------+----------+ | | |
|Edge Gateway, FPS,|13.x |13.0.0 - |None |Low |3.3 |Linux |
|GTM, Link | |13.1.3 | | | |kernel |
|Controller, PEM, +------+----------+----------+ | | |
|WebAccelerator) |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.5.1 - |None | | | |
| | |11.6.5 | | | | |
+------------------+------+----------+----------+-----------+------+----------+
| | | |Not |Not | | |
|Enterprise Manager|3.x |None |applicable|vulnerable^|None |None |
| | | | |2 | | |
+------------------+------+----------+----------+-----------+------+----------+
| |6.x |None |Not | | | |
|BIG-IQ Centralized| | |applicable|Not | | |
|Management +------+----------+----------+vulnerable^|None |None |
| |5.x |None |Not |2 | | |
| | | |applicable| | | |
+------------------+------+----------+----------+-----------+------+----------+
| | | |Not |Not | | |
|F5 iWorkflow |2.x |None |applicable|vulnerable^|None |None |
| | | | |2 | | |
+------------------+------+----------+----------+-----------+------+----------+
| |5.x |5.0.0 - |None | | | |
|Traffix SDC | |5.1.0 | |Low |3.3 |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.
^2The specified products contain the affected code. However, F5 identifies the
vulnerability status as Not vulnerable because the attacker cannot exploit the
code in default, standard, or recommended configurations.
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
BIG-IP
To mitigate this vulnerability, you should permit management access to F5
products only over a secure network and restrict command line/Configuration
utility access for affected systems to only administrative users. For more
information, refer to K13309: Restricting access to the Configuration utility
by source IP address (11.x - 14.x) and K13092: Overview of securing access to
the BIG-IP system.
Traffix SDC
None
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