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CVE-2016-20012

Date: September 15, 2021

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

Language: C

Severity Score

Related Resources (12)

https://nvd.nist.gov/vuln/detail/CVE-2016-20012
https://github.com/openssh/openssh-portable/pull/270
https://www.openwall.com/lists/oss-security/2018/08/24/1
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
https://security-tracker.debian.org/tracker/CVE-2016-20012
https://rushter.com/blog/public-ssh-keys/
https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak
https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
https://access.redhat.com/security/cve/CVE-2016-20012
https://security.netapp.com/advisory/ntap-20211014-0005/
https://www.mend.io/vulnerability-database/CVE-2016-20012

Severity Score

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): NONE
Additional information:

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