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CVE-2021-36368

3.7 · LOW

An issue was discovered in OpenSSH before 8.9.

Published Mar 13, 2022CWE-287EPSS 1.68%

Overview

CVE-2021-36368 is a low-severity vulnerability. It was published on March 13, 2022 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

An issue was discovered in OpenSSH before 8.9. If a client is using public-key authentication with agent forwarding but without -oLogLevel=verbose, and an attacker has silently modified the server to support the None authentication option, then the user cannot determine whether FIDO authentication is going to confirm that the user wishes to connect to that server, or that the user wishes to allow that server to connect to a different server on the user's behalf. NOTE: the vendor's position is "this is not an authentication bypass, since nothing is being bypassed.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugzilla.mindrot.org/show_bug.cgi?id=3316Refdocs.ssh-mitm.at/trivialauth.htmlGitHubgithub.com/openssh/openssh-portable/pull/258Refsecurity-tracker.debian.org/tracker/CVE-2021-36368Refwww.openssh.com/security.htmlRefbugzilla.mindrot.org/show_bug.cgi?id=3316Refdocs.ssh-mitm.at/trivialauth.htmlGitHubgithub.com/openssh/openssh-portable/pull/258Refsecurity-tracker.debian.org/tracker/CVE-2021-36368Refwww.openssh.com/security.html

How CyberStrike helps

Frequently asked questions

What is CVE-2021-36368?

CVE-2021-36368 is a low-severity vulnerability. It was published on March 13, 2022 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2021-36368?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2021-36368?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-36368?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-36368 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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