CVE-2021-36368

CVSS 3.7 LOWEPSS 1.7%CWE-287

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 3.7EPSS 1.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

12 Mar 2022Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

n/a · n/a

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References

https://bugzilla.mindrot.org/show_bug.cgi?id=3316 https://docs.ssh-mitm.at/trivialauth.html https://github.com/openssh/openssh-portable/pull/258 https://security-tracker.debian.org/tracker/CVE-2021-36368 https://www.openssh.com/security.html