CVE-2016-20012
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.
Does this matter?
Lower severity and a low EPSS score (5.33%). Track it; it rarely justifies an emergency change on its own.
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
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- EPSS
- 5.33% probability · 92th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-203
- Affected
- openbsd/openssh · netapp/clustered data ontap · netapp/hci management node · netapp/ontap select deploy administration utility · netapp/solidfire
- Source
- cve@mitre.org
References
- https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265Exploit, Third Party Advisory
- https://github.com/openssh/openssh-portable/pull/270Patch, Third Party Advisory
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097Issue Tracking, Third Party Advisory
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185Issue Tracking, Third Party Advisory
- https://rushter.com/blog/public-ssh-keys/Exploit, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211014-0005/Third Party Advisory
- https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeakThird Party Advisory
- https://www.openwall.com/lists/oss-security/2018/08/24/1Mailing List, Third Party Advisory
- https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265Exploit, Third Party Advisory
- https://github.com/openssh/openssh-portable/pull/270Patch, Third Party Advisory
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097Issue Tracking, Third Party Advisory
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185Issue Tracking, Third Party Advisory
- https://rushter.com/blog/public-ssh-keys/Exploit, Third Party Advisory
- https://security.netapp.com/advisory/ntap-20211014-0005/Third Party Advisory
- https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeakThird Party Advisory
- https://www.openwall.com/lists/oss-security/2018/08/24/1Mailing List, Third Party Advisory
- https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.