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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.4547.3
Linux kernel and TMM vulnerability CVE-2020-25705
17 August 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
BIG-IQ
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Access Confidential Data -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
Resolution: Mitigation
CVE Names: CVE-2020-25705 CVE-2018-10675
Reference: ESB-2020.4505
ESB-2020.4391
ESB-2020.4377
ESB-2020.4375
Original Bulletin:
https://support.f5.com/csp/article/K09604370
https://support.f5.com/csp/article/K40540405
Revision History: August 17 2021: Vendor issues branch updates
January 22 2021: K09604370 - Vendor added additional vulnerable component
December 24 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K09604370: Linux kernel vulnerability CVE-2020-25705
Security Advisory
Original Publication Date: Dec 24, 2020
Updated Date: Mar 19, 2021
Security Advisory Description
A flaw in the way reply ICMP packets are limited in the Linux kernel
functionality was found that allows to quickly scan open UDP ports. This flaw
allows an off-path remote user to effectively bypassing source port UDP
randomization. The highest threat from this vulnerability is to confidentiality
and possibly integrity, because software that relies on UDP source port
randomization are indirectly affected as well. Kernel versions before 5.10 may
be vulnerable to this issue. (CVE-2020-25705)
Impact
A remote off-path attacker can determine open User Datagram Protocol (UDP)
source ports on a vulnerable system based on Internet Control Message Protocol
(ICMP) error messages, making it possible to execute a "SAD DNS attack."
Security Advisory Status
F5 Product Development has assigned ID 974093 (BIG-IP) and ID 974093-4 and
974093-5 (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 or |
| | |be |in | |1 |feature |
| | |vulnerable| | | | |
+--------------+------+----------+----------+----------+------+---------------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
|BIG-IP (LTM, |15.x |None |Not | | | |
|AAM, Advanced | | |applicable| | | |
|WAF, AFM, +------+----------+----------+ | | |
|Analytics, |14.x |None |14.1.0 | | |Linux kernel |
|APM, ASM, +------+----------+----------+High |7.4 |(ICMP |
|DDHD, DNS, |13.x |13.1.0 - |None | | |implementation)|
|FPS, GTM, Link| |13.1.3 | | | | |
|Controller, +------+----------+----------+ | | |
|PEM, SSLO) |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+--------------+------+----------+----------+----------+------+---------------+
| |8.x |None |8.0.0 | | | |
| +------+----------+----------+ | | |
| |7.x |7.0.0 - |None | | | |
|BIG-IQ | |7.1.0 | | | |Linux kernel |
|Centralized +------+----------+----------+High |7.4 |(ICMP |
|Management |6.x |6.0.0 - |None | | |implementation)|
| | |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
Block outgoing ICMP port unreachable messages on the management interface
To mitigate this vulnerability on the management interface, you can block
outgoing ICMP port unreachable messages. To do so, perform the following
procedure:
Impact of action: The impact of blocking ICMP packets depends on your specific
environment. F5 recommends testing any such changes during a maintenance window
with consideration to the possible impact on your specific environment.
1. Log in to the BIG-IP command line.
2. Block outgoing ICMP port unreachable messages by entering the following
command:
iptables -A OUTPUT -p icmp --icmp-type destination-unreachable -j DROP
3. Create a backup of the /config/startup file by entering the following
command:
cp /config/startup /config/startup.backup
4. Using a text editor, edit the /config/startup file.
5. To ensure iptables changes persist across a reboot, add the following lines
at the end of the file:
# For CVE-2020-25705 described in K09604370
#
iptables -A OUTPUT -p icmp --icmp-type destination-unreachable -j DROP
#
6. Save the /config/startup file and exit the editor.
Supplemental Information
o K14813: Detecting and mitigating DoS/DDoS attacks (11.4.x - 16.x)
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
- --------------------------------------------------------------------------------
K40540405: Linux kernel vulnerability CVE-2018-10675
Original Publication Date: 24 Dec, 2020
Latest Publication Date: 17 Aug, 2021
Security Advisory Description
The do_get_mempolicy function in mm/mempolicy.c in the Linux kernel before
4.12.9 allows local users to cause a denial of service (use-after-free) or
possibly have unspecified other impact via crafted system calls. (
CVE-2018-10675)
Impact
A local attacker can cause a denial-of-service (DoS) or other negative impacts
on a vulnerable system.
Security Advisory Status
F5 Product Development has assigned ID 976181 (BIG-IP), ID 976409 (BIG-IQ),
and CPF-25230 (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 |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|Advanced WAF, AFM, |14.x |None |Not | | | |
|Analytics, APM, ASM, | | |applicable| | |Linux |
|DDHD, DNS, FPS, GTM, +------+----------+----------+Medium |5.5 |kernel |
|Link Controller, PEM,|13.x |None |Not | | | |
|SSLO) | | |applicable| | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |8.x |None |8.0.0 | | | |
| +------+----------+----------+ | | |
| |7.x |7.0.0 - |None | | | |
|BIG-IQ Centralized | |7.1.0 | | | |Linux |
|Management +------+----------+----------+Medium |5.5 |kernel |
| |6.x |6.0.0 - |None | | | |
| | |6.1.0 | | | | |
| +------+----------+----------+ | | |
| |5.x |5.4.0 |None | | | |
+---------------------+------+----------+----------+--------+------+----------+
|Traffix SDC |5.x |5.1.0 |5.1.0 CF |Medium |5.5 |Linux |
| | | |22 | | |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 about this
mitigation that is applicable to the BIG-IP system, 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
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===========================================================================
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The University of Queensland
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Internet Email: auscert@auscert.org.au
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