CVE Vulnerability

CVE-2021-36368

** DISPUTED ** 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."

2.6 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 4.9 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

Scope

3.7 /10

CVSS v3.0 : LOW

V3 Legend

Vector :

Exploitability : 2.2 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/openssh/openssh-portable/pull/258 Patch Third Party Advisory
https://docs.ssh-mitm.at/trivialauth.html Third Party Advisory
https://bugzilla.mindrot.org/show_bug.cgi?id=3316 Issue Tracking Third Party Advisory
https://www.openssh.com/security.html Vendor Advisory
https://security-tracker.debian.org/tracker/CVE-2021-36368 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Information

Published : 2022-03-13 12:15

Updated : 2022-07-01 05:21

NVD link : CVE-2021-36368

Mitre link : CVE-2021-36368

Products Affected
No products.
CWE
CWE-287