Vulnerability Monitor

The vendors, products, and vulnerabilities you care about

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. 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

Published

2021-09-15T20:15:07.310

Last Modified

2024-11-21T02:47:33.240

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.3 (MEDIUM)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:P/I:N/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Primary
NVD-CWE-Other

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	openbsd	openssh	≤ 8.7	Yes
Application	netapp	clustered_data_ontap	-	Yes
Application	netapp	hci_management_node	-	Yes
Application	netapp	ontap_select_deploy_administration_utility	-	Yes
Application	netapp	solidfire	-	Yes

References

https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 Exploit, Third Party Advisory ([email protected])
https://github.com/openssh/openssh-portable/pull/270 Patch, Third Party Advisory ([email protected])
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 Issue Tracking, Third Party Advisory ([email protected])
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 Issue Tracking, Third Party Advisory ([email protected])
https://rushter.com/blog/public-ssh-keys/ Exploit, Third Party Advisory ([email protected])
https://security.netapp.com/advisory/ntap-20211014-0005/ Third Party Advisory ([email protected])
https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak Third Party Advisory ([email protected])
https://www.openwall.com/lists/oss-security/2018/08/24/1 Mailing List, Third Party Advisory ([email protected])
https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/openssh/openssh-portable/pull/270 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://rushter.com/blog/public-ssh-keys/ Exploit, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20211014-0005/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.openwall.com/lists/oss-security/2018/08/24/1 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)