Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2020.4494
BIG-IP ASM vulnerability CVE-2020-27718
18 December 2020
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP ASM
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-27718
Original Bulletin:
https://support.f5.com/csp/article/K58102101
- --------------------------BEGIN INCLUDED TEXT--------------------
K58102101: BIG-IP ASM vulnerability CVE-2020-27718
Original Publication Date: 17 Dec, 2020
Security Advisory Description
When the BIG-IP ASM system processes requests with JSON payload, an unusually
large number of parameters can cause excessive CPU usage in the BIG-IP ASM bd
process. (CVE-2020-27718)
Impact
When this vulnerability is exploited, the BIG-IP ASM system may take longer
than usual to process these requests. As a result, the BIG-IP ASM system may
experience some latency when passing requests to the backend server. Only
BIG-IP ASM systems configured with JSON content profile with parameter parsing
(enabled by default) are affected.
Security Advisory Status
F5 Product Development has assigned ID 917509 (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| | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |16.0.0 |16.0.1 | | | |
| +------+----------+----------+ | | |
| |15.x |15.0.0 - |15.1.1 | | | |
| | |15.1.0 | | | | |
| +------+----------+----------+ | | |
| |14.x |14.1.0 - |14.1.3.1 | | | |
| | |14.1.3 | | | | |
|BIG-IP (Advanced +------+----------+----------+High |7.5 |bd process|
|WAF, ASM) |13.x |13.1.0 - |13.1.3.5 | | | |
| | |13.1.3 | | | | |
| +------+----------+----------+ | | |
| |12.x |12.1.0 - |None | | | |
| | |12.1.5 | | | | |
| +------+----------+----------+ | | |
| |11.x |11.6.1 - |None | | | |
| | |11.6.5 | | | | |
+-------------------+------+----------+----------+----------+------+----------+
| |16.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |15.x |None |Not | | | |
| | | |applicable| | | |
|BIG-IP (LTM, AAM, +------+----------+----------+ | | |
|AFM, Analytics, |14.x |None |Not | | | |
|APM, DDHD, DNS, | | |applicable|Not | | |
|FPS, GTM, Link +------+----------+----------+vulnerable|None |None |
|Controller, PEM, |13.x |None |Not | | | |
|SSLO) | | |applicable| | | |
| +------+----------+----------+ | | |
| |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 |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
None
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 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--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
https://www.auscert.org.au/bulletins/
===========================================================================
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.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967
iQIVAwUBX9wwOONLKJtyKPYoAQiCLQ//c4cLm7rF+XdilZJd8+BROv8AI/a1QLAD
DGmf36NntcE2kD/CAJ0VjWv+stohc1I+WHlzknqwzNmDbEuTlX9cAnOpHRgQxpB8
Y8cv0344humSggPwXr48b3wVo6xXQyEL0QHJ21ljNOn3hfZajC3oUC8CgO8tKzkr
mdZkuca2zKkO4Whx6XSl5tiG6zTSmdniV1PbRn2L4z2sfXPH+U/B+ZAsu0mneeoI
oU+z2aMOFelxQW6hdGzKiOUQ3ISeBoWwNyabmX//N9PwGUo0B5zlf4uTFUNKk+6A
ObTEiXk/YZmVbJgo8S8JqmgK2AXMIn3gZ3+4oDzERHJoKfkVVHPGrS8bKIFYNj6h
VHDKMeCSX5my1Lei7aEWBQzWZNykxf2Y9Rk/Z+wBuDLYK4DBx2oQO70/in17H49Q
hroGB1IWy3727AOkutqdSG8U3vvKdO11GeS6bJ8CPn3LziiyeZ9JaOA0Lmeg9CtO
MGh3XkzZj9KcvyBBiqW01DT3tppcPgpQqv4sNLE9VDKV17sxParOUOcM1ZhFCoHF
dN1rIzOpkSGZxxmZbhqvgiTUPF5EtsZAoUIcxWwWQISsF0o86sYTWvWXAgTOaW8L
d8w9UNSkzUS5tEIpugfkDcps+cAGQg/39hch01QwUklIAdO1uSXT4W8J3mxdaqkk
OkVj6so3Ri8=
=sizQ
-----END PGP SIGNATURE-----