Medium severity · published Sep 15, 2021
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…
5.3
CVSS
5.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)5.3% · higher than 93% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CD
Clustered Data Ontap · Netapp
All versions, or not specified · source: NVD
HM
Hci Management Node · Netapp
All versions, or not specified · source: NVD
OS
Ontap Select Deploy Administration Utility · Netapp
All versions, or not specified · source: NVD
OP
Openssh · Openbsd
through 8.7 · source: NVD
SO
Solidfire · Netapp
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-20012
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-20012
Exploit
https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265
Patch
https://github.com/openssh/openssh-portable/pull/270
Issue Tracking
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
Issue Tracking
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
Exploit
https://rushter.com/blog/public-ssh-keys/
Third Party Advisory
https://security.netapp.com/advisory/ntap-20211014-0005/
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