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AUSCERT External Security Bulletin Redistribution
ESB-2020.4547.2
Linux kernel and TMM vulnerability CVE-2020-25705
22 January 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
Comment: This bulletin contains two (2) F5 Networks security advisories.
Revision History: January 22 2021: K09604370 - Vendor added additional vulnerable component
December 24 2020: Initial Release
- --------------------------BEGIN INCLUDED TEXT--------------------
K09604370: Linux kernel and TMM vulnerability CVE-2020-25705
Original Publication Date: 24 Dec, 2020
Latest Publication Date: 22 Jan, 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-control plane), ID 982697
(BIG-IP-data plane) and ID 974093-4 (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| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
|BIG-IP (LTM, | | |applicable| | | |
|AAM, Advanced +------+----------+----------+ | | |
|WAF, AFM, |14.x |None |Not | | |Linux kernel |
|Analytics, | | |applicable| | |(control |
|APM, ASM, +------+----------+----------+High |7.4 |plane): 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 | | | | |
+--------------+------+----------+----------+----------+------+---------------+
| |16.x |16.0.0 - |None | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
|BIG-IP (LTM, | |15.1.2 | | | | |
|AAM, Advanced +------+----------+----------+ | | |
|WAF, AFM, |14.x |14.1.0 - |None | | | |
|Analytics, | |14.1.3 | | | |TMM^2 (data |
|APM, ASM, +------+----------+----------+High |7.4 |plane): 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 | | | | |
+--------------+------+----------+----------+----------+------+---------------+
| |7.x |7.0.0 - |None | | | |
| | |7.1.0 | | | | |
|BIG-IQ +------+----------+----------+ | |Linux kernel |
|Centralized |6.x |6.0.0 - |None |High |7.4 |and TMM (ICMP |
|Management | |6.1.0 | | | |implementation)|
| +------+----------+----------+ | | |
| |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.
^2The Traffic Management Microkernel (TMM)
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
o BIG-IP control plane: Block outgoing ICMP port unreachable messages on the
management interface
o BIG-IP data plane: Lower the ICMP rate limit on TMM interfaces
Configure the maximum reject rate
Configure the ICMP error rate
BIG-IP control plane: 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.
BIG-IP data plane: Lower the ICMP rate limit on TMM interfaces
To mitigate this vulnerability on the Traffic Management Microkernel (TMM)
interfaces, you can lower the ICMP rate limit. Adjust to a lower value to
lessen the possibility of the vulnerability being exploited, but ensure it is
still acceptable based on your environment and conditions. To do so, perform
the following procedure:
Configure the maximum reject rate
The tm.maxrejectrate database key allows you to adjust the number of TCP RST
packets or ICMP unreachable packets that the BIG-IP system sends in response to
incoming client-side or server-side packets that cannot be matched with
existing connections to BIG-IP virtual servers, self IP addresses, or secure
network address translations (SNATs). The default value for the
tm.maxrejectrate key is 250 TCP RSTs or 250 ICMP unreachable packets per
second. The minimum value allowed is 1 and the maximum value is 1000.
To adjust the rate at which the BIG-IP system issues TCP RSTs or ICMP
unreachable packets, perform the following procedure:
Impact of action: The impact of lowering the rate limit of 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 TMOS Shell (tmsh) by entering the following command:
tmsh
2. Adjust the tm.maxrejectrate database key by using the following command
syntax:
modify sys db tm.maxrejectrate value
For example, to change tm.maxrejectrate to 50, enter the following command:
modify sys db tm.maxrejectrate value 50
Configure the ICMP error rate
The tm.maxicmprate BigDB key allows you to limit the number of responses the
BIG-IP LTM system sends for ICMP errors. The default value for the
tm.maxicmprate BigDB key is 100.
To adjust the number of ICMP error responses from a BIG-IP system, perform the
following procedure:
Impact of action: The impact of lowering the rate limit of 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 tmsh by entering the following command:
tmsh
2. Adjust the tm.maxicmprate database key by using the following command
syntax:
modify /sys db tm.maxicmprate value
For example, to change tm.maxicmprate to 50, enter the following command:
modify sys db tm.maxicmprate value 50
3. If the tm.maxforwardicmprate database key is not set to the default value
of 0, lower the value by using the previous command syntax replacing
tm.maxicmprate with tm.maxforwardicmprate.
Supplemental Information
o K13151: Configuring the rate at which the BIG-IP system issues TCP RSTs or
ICMP unreachable packets
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
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 | | | | |
+---------------------+------+----------+----------+--------+------+----------+
| |7.x |7.0.0 - |None | | | |
| | |7.1.0 | | | | |
|BIG-IQ Centralized +------+----------+----------+ | |Linux |
|Management |6.x |6.0.0 - |None |Medium |5.5 |kernel |
| | |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.
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, 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
- --------------------------END INCLUDED TEXT--------------------
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NOTE: This is only the original release of the security bulletin. It may
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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
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