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AUSCERT External Security Bulletin Redistribution
ESB-2019.3888
Linux kernel vulnerability CVE-2019-13233
18 October 2019
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AusCERT Security Bulletin Summary
---------------------------------
Product: F5 BIG-IP products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Unauthorised Access -- Console/Physical
Resolution: Mitigation
CVE Names: CVE-2019-13233
Reference: ESB-2019.3590
ESB-2019.3048
ESB-2019.2626
Original Bulletin:
https://support.f5.com/csp/article/K13331647
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K13331647: Linux kernel vulnerability CVE-2019-13233
Security Advisory
Original Publication Date: 16 Oct, 2019
Security Advisory Description
In arch/x86/lib/insn-eval.c in the Linux kernel before 5.1.9, there is a
use-after-free for access to an LDT entry because of a race condition between
modify_ldt() and a #BR exception for an MPX bounds violation. (CVE-2019-13233)
Impact
An attacker may be able to cause modification or disclosure of information.
Security Advisory Status
F5 Product Development has assigned ID 830381 (BIG-IP) 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 | | | |
| | |15.0.1 | | | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, AAM, |14.x |14.0.0 - |None | | | |
|AFM, Analytics, | |14.1.2 | | | | |
|APM, ASM, DNS, Edge+------+----------+----------+ | | |
|Gateway, FPS, GTM, |13.x |13.1.0 - |None |Medium |5.1 |Linux |
|Link Controller, | |13.1.3 | | | |kernel |
|PEM, +------+----------+----------+ | | |
|WebAccelerator, |12.x |None |Not | | | |
|WebSafe) | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Enterprise Manager |3.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|F5 iWorkflow |2.x |None |Not |Not |None |None |
| | | |applicable|vulnerable| | |
+-------------------+------+----------+----------+----------+------+----------+
|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, do the following:
o Only permit authorized physical access to F5 products.
o Only permit management access to F5 products over a secure network and
limit shell access to trusted users.
For more information about securing access to BIG-IP/Enterprise Manager
systems, 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.
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