CVE-2021-36368

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 (Fast Identity Online) 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 users behalf. NOTE: the vendors position is "this is not an authentication bypass, since nothing is being bypassed.

Risk Information

Base Score

3.7

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.395

Associated Vulnerability

Vulnerability	OS Platform
Improper Authentication Vulnerability (CVE-2021-36368)	NCM

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234