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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.4318.3
Linux kernel vulnerability CVE-2017-10661
17 August 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: F5 Products
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Existing Account
Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2017-18344 CVE-2017-10661
Reference: ESB-2019.4547
ESB-2019.4546
ESB-2019.2341
ESB-2019.1800
ESB-2018.3377
ESB-2018.2335
Original Bulletin:
https://support.f5.com/csp/article/K04337834
https://support.f5.com/csp/article/K07020416
Revision History: August 17 2021: Vendor issues branch and versions updates
December 9 2020: Vendor issues minor branch updates
December 8 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K04337834: Linux kernel vulnerability CVE-2017-10661
Security Advisory
Original Publication Date: Dec 08, 2020
Updated Date: Aug 05, 2021
Security Advisory Description
Race condition in fs/timerfd.c in the Linux kernel before 4.10.15 allows local
users to gain privileges or cause a denial of service (list corruption or
use-after-free) via simultaneous file-descriptor operations that leverage
improper might_cancel queueing. (CVE-2017-10661)
Impact
A locally logged-in attacker can gain unauthorized access to resources or cause
a denial of service (DoS) on a vulnerable system.
Security Advisory Status
F5 Product Development has assigned ID 968725 (BIG-IP), ID 968725-1 (BIG-IQ),
and CPF-25223 (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, 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| | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |16.x |16.0.0 - |16.1.0 | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.3 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |14.1.0 - |None | | | |
|Analytics, APM, ASM, | |14.1.4 | | | |Linux |
|DDHD, DNS, FPS, GTM, +------+----------+----------+Medium |5.3 |kernel |
|Link Controller, PEM,|13.x |13.1.0 - |None | | | |
|SSLO) | |13.1.4 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.6 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |7.x |7.0.0 - |None | | | |
| | |7.1.0 | | | | |
|BIG-IQ Centralized +------+----------+----------+ | |Linux |
|Management |6.x |6.0.0 - |None |Medium |5.3 |kernel |
| | |6.1.0 | | | | |
| +------+----------+----------+ | | |
| |5.x |5.4.0 |None | | | |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |5.1.0 |None |Medium |5.3 |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.
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 permit management access to F5
products only over a secure network and restrict command line access for
affected systems to only trusted users. For more information, refer to K13309:
Restricting access to the Configuration utility by source IP address (11.x -
16.x) and K13092: Overview of securing access to the BIG-IP system.
Supplemental Information
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 K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
o K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
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
- --------------------------------------------------------------------------------
K07020416: Linux kernel vulnerability CVE-2017-18344
Original Publication Date: 08 Dec, 2020
Latest Publication Date: 17 Aug, 2021
Security Advisory Description
The timer_create syscall implementation in kernel/time/posix-timers.c in the
Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify
field, which leads to out-of-bounds access in the show_timer function (called
when /proc/$PID/timers is read). This allows userspace applications to read
arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and
CONFIG_CHECKPOINT_RESTORE). (CVE-2017-18344)
Impact
A local attacker may use this vulnerability to expose sensitive information or
cause a denial of service (DoS), making the system unresponsive.
Security Advisory Status
F5 Product Development has assigned ID 968729 (BIG-IP) and ID 968729-1 (BIG-IQ)
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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |16.0.0 - |16.1.0 | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.2 | | | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |14.1.0 - |None | | | |
|Analytics, APM, | |14.1.3 | | | |Linux |
|ASM, DDHD, DNS, +------+----------+----------+High |7.1 |Kernel |
|FPS, GTM, Link |13.x |13.1.0 - |None | | | |
|Controller, PEM, | |13.1.3 | | | | |
|SSLO) +------+----------+----------+ | | |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+-------------------+------+----------+----------+----------+------+----------+
| |8.x |8.0.0 - |None | | | |
| | |8.1.0 | | | | |
| +------+----------+----------+ | | |
| |7.x |7.0.0 - |None | | | |
|BIG-IQ Centralized | |7.1.0 | |High |7.1 |Linux |
|Management +------+----------+----------+ | |Kernel |
| |6.x |6.0.0 - |None | | | |
| | |6.1.0 | | | | |
| +------+----------+----------+ | | |
| |5.x |5.4.0 |None | | | |
+-------------------+------+----------+----------+----------+------+----------+
|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.
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, permit management access to F5 products only
over a secure network and restrict command line access for affected systems to
trusted users. For more information, refer to K13309: Restricting access to the
Configuration utility by source IP address (11.x - 16.x) and K13092: Overview
of securing access to the BIG-IP system.
Supplemental Information
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 K9502: BIG-IP hotfix and point release matrix
o K13123: Managing BIG-IP product hotfixes (11.x - 16.x)
o K15106: Managing BIG-IQ product hotfixes
o K15113: BIG-IQ hotfix and point release matrix
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
- --------------------------END INCLUDED TEXT--------------------
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