Description
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
Related CPE's
References
https://github.com/openssh/openssh-portable/pull/270
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
https://rushter.com/blog/public-ssh-keys/
https://security.netapp.com/advisory/ntap-20211014-0005/
https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak
https://www.openwall.com/lists/oss-security/2018/08/24/1
https://github.com/openssh/openssh-portable/pull/270
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
https://rushter.com/blog/public-ssh-keys/
https://security.netapp.com/advisory/ntap-20211014-0005/
https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak
https://www.openwall.com/lists/oss-security/2018/08/24/1
CVSS impact metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3 · Medium
Information
Source identifier
Vulnerability status
Modified
Published
2021-09-15T20:15:07.310Z
5 years agoLast modified
2026-06-17T00:43:05.063Z
3 months ago