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AUSCERT External Security Bulletin Redistribution
ESB-2020.1752
Linux kernel vulnerability CVE-2019-20636
18 May 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP (LTM, AAM, AFM, Analytics, APM, ASM, DNS, FPS, GTM, Link Controller, PEM)
BIG-IQ Centralized Management
Traffix SDC
Publisher: F5 Networks
Operating System: Network Appliance
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Modify Arbitrary Files -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2019-20636
Original Bulletin:
https://support.f5.com/csp/article/K45501314
Comment: This advisory references vulnerabilities in the Linux kernel that
also affect distributions other than F5 Networks. It is recommended
that administrators running Linux check for an updated version of
the kernel for their system.
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K45501314:Linux kernel vulnerability CVE-2019-20636
Security Advisory
Original Publication Date: 16 May, 2020
Security Advisory Description
In the Linux kernel before 5.4.12, drivers/input/input.c has out-of-bounds
writes via a crafted keycode table, as demonstrated by input_set_keycode, aka
CID-cb222aed03d7. (CVE-2019-20636)
Impact
A local user with root access can insert garbage to this keycode table that can
lead to out-of-bounds memory access. This vulnerability may lead to issues
with data confidentiality and integrity as well as system availability.
Security Advisory Status
F5 Product Development has assigned CPF-25190 CPF-25191 (Traffix) 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 |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |14.x |None |Not | | | |
|BIG-IP (LTM, AAM, | | |applicable| | | |
|AFM, Analytics, +------+----------+----------+ | | |
|APM, ASM, DNS, FPS,|13.x |None |Not |Not |None |None |
|GTM, Link | | |applicable|vulnerable| | |
|Controller, PEM) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |7.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IQ Centralized |6.x |None |Not |Not |None |None |
|Management | | |applicable|vulnerable| | |
| +------+----------+----------+ | | |
| |5.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
|Traffix SDC |5.x |5.1.0 |None |Medium |6.7 |Linux |
| | | | | | |Kernel |
+-------------------+------+----------+----------+----------+------+----------+
^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
None
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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