CVE-2016-20012 Information

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Description

DISPUTED OpenSSH through 8.7 allows remote attackers who have a suspicion that a certain combination of username and public key is known to an SSH server to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product.

CVSS Vector

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

Reference

https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 https://github.com/openssh/openssh-portable/pull/270 https://rushter.com/blog/public-ssh-keys/ https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak https://security.netapp.com/advisory/ntap-20211014-0005/ https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 https://www.openwall.com/lists/oss-security/2018/08/24/1

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

5.3