CVE-2021-36368

Description

** 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."

CvssV3 impact

BaseSeverity

LOW

ConfidentialityImpact

LOW

AttackComplexity

HIGH

Scope

UNCHANGED

AttackVector

NETWORK

AvailabilityImpact

NONE

IntegrityImpact

NONE

PrivilegesRequired

NONE

BaseScore

3.7

VectorString

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

Version

3.1

UserInteraction

NONE

CvssV2 impact

AccessComplexity

HIGH

ConfidentialityImpact

PARTIAL

AvailabilityImpact

NONE

IntegrityImpact

NONE

BaseScore

2.6

VectorString

AV:N/AC:H/Au:N/C:P/I:N/A:N

Version

2.0

AccessVector

NETWORK

Authentication

NONE