Home/CVE/OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key
CVE

CVE-2016-20012

OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key

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.

MEDIUM · CVSS 5.3 EPSS 0.08647
Schedule remediation
  • EPSS percentile: top 7% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
Sigma rules2 YARA rules0
▤

Affected Products & Versions

5
openbsd openssh<= 8.7
netapp clustered data ontapall versions
netapp hci management nodeall versions
netapp ontap select deploy administration utilityall versions
netapp solidfireall versions
⚠

Public Exploits & PoCs

2
pocgithub.com · auth2-pubkey.c#L261-L265github.com
pocrushter.com · public-ssh-keysrushter.com
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumSuspicious OpenSSH Daemon Error
productmediumOpenSSH Server Listening On Socket
▣

Scoring & Timeline

5.3
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD15 Sep 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
⚑

Vendor Advisories

1
msrcCVE-2016-20012
🔗

References & Sources

6
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/openssh/openssh-portable/pull/270PatchThird Party Advisory
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097Issue TrackingThird Party Advisory
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185Issue TrackingThird 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 ListThird Party Advisory
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