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AUSCERT External Security Bulletin Redistribution
ESB-2021.0635.2
cURL vulnerability CVE-2020-8286
14 September 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: BIG-IP
Publisher: F5 Networks
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2020-8286
Reference: ESB-2020.4506
ESB-2020.4364
Original Bulletin:
https://support.f5.com/csp/article/K15402727
Revision History: September 14 2021: Vendor updated the versions and component/feature known to be vulnerable
February 19 2021: Initial Release
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K15402727: cURL vulnerability CVE-2020-8286
Original Publication Date: 19 Feb, 2021
Latest Publication Date: 13 Sep, 2021
Security Advisory Description
curl 7.41.0 through 7.73.0 is vulnerable to an improper check for certificate
revocation due to insufficient verification of the OCSP response. (
CVE-2020-8286)
Impact
An attacker could provide a forged OCSP response to the F5 product that has
made the request with curl, and this fake response could make it appear that a
TLS certificate is valid when it may have actually been revoked.
Security Advisory Status
F5 Product Development has assigned ID 981917 (BIG-IP) and ID 981917-5
(BIG-IQ), and ID 999377 (F5OS) 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 - |None | | | |
| | |16.0.1 | | | | |
| +------+----------+----------+ | | |
| |15.x |15.1.0 - |None | | | |
| | |15.1.2 | | | |curl/ |
|BIG-IP (LTM, AAM, +------+----------+----------+ | |libcurl |
|Advanced WAF, AFM,|14.x |14.1.0 - |None | | |(Command |
|Analytics, APM, | |14.1.3 | | | |Line |
|ASM, DDHD, DNS, +------+----------+----------+High |7.4 |Interface, |
|FPS, GTM, Link |13.x |13.1.0 - |None | | |EAV |
|Controller, PEM, | |13.1.3 | | | |Monitors, |
|SSLO) +------+----------+----------+ | |iRules) |
| |12.x |None |Not | | | |
| | | |applicable| | | |
| +------+----------+----------+ | | |
| |11.x |None |Not | | | |
| | | |applicable| | | |
+------------------+------+----------+----------+----------+------+-----------+
| |8.x |8.0.0 |None | | | |
| +------+----------+----------+ | |curl/ |
|BIG-IQ Centralized|7.x |None |Not | | |libcurl |
|Management | | |applicable|High |7.4 |(Command |
| +------+----------+----------+ | |Line |
| |6.x |None |Not | | |Interface) |
| | | |applicable| | | |
+------------------+------+----------+----------+----------+------+-----------+
| | | | | | |curl/ |
| | | | | | |libcurl |
|F5OS |1.x |1.0.0 - |None |High |7.4 |(Command |
| | |1.1.4 | | | |Line |
| | | | | | |Interface, |
| | | | | | |confd) |
+------------------+------+----------+----------+----------+------+-----------+
|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
o Restrict the Management Interface access to only trusted users. For more
information regarding the BIG-IP system, refer to the following article:
K13092: Overview of securing access to the BIG-IP system.
o Connect to only trusted OCSP responders.
o If feasible, remove EAV monitors or iRules that use curl to access OCSP
responders.
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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