PT-2022-10510 · Openssh+3 · Openssh+3
Manfred-Kaiser
·
Published
2022-03-12
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Updated
2025-11-21
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CVE-2021-36368
CVSS v3.1
3.7
Low
| Vector | AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
OpenSSH versions prior to 8.9
Description
An issue was discovered in OpenSSH where a client using public-key authentication with agent forwarding but without -oLogLevel=verbose may be unable to determine whether FIDO authentication is confirming a connection to the intended server or allowing the server to connect to a different server on the user's behalf, if an attacker has silently modified the server to support the None authentication option.
Recommendations
For versions prior to 8.9, update to version 8.9 or later to resolve the issue. As a temporary workaround, consider using -oLogLevel=verbose to increase logging and potentially detect such modifications. Restrict access to the server and limit agent forwarding to minimize the risk of exploitation.
Exploit
Fix
Improper Authentication
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Debian
Openssh
Red Os