CVE-2016-20012

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2016-20012
** DISPUTED ** 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.

5.3 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

4.3 /10

CVSS v2.0 : MEDIUM

V2 Legend

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

Exploitability : 8.6 / Impact : 2.9

Access Vector NETWORK

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

References
Link Resource
https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 Exploit Third Party Advisory
https://github.com/openssh/openssh-portable/pull/270 Patch Third Party Advisory
https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 Issue Tracking Third Party Advisory
https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 Issue 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/SSHKeysAreInfoLeak Third Party Advisory
https://www.openwall.com/lists/oss-security/2018/08/24/1 Mailing List Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
History

18 Apr 2022, 18:06

Type Values Removed Values Added
References (MISC) https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 - (MISC) https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 - Issue Tracking, Third Party Advisory
References (MISC) https://www.openwall.com/lists/oss-security/2018/08/24/1 - (MISC) https://www.openwall.com/lists/oss-security/2018/08/24/1 - Mailing List, Third Party Advisory
References (MISC) https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 - (MISC) https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 - Issue Tracking, Third Party Advisory

24 Feb 2022, 15:15

Type Values Removed Values Added
References
  • (MISC) https://www.openwall.com/lists/oss-security/2018/08/24/1 -
  • (MISC) https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 -
  • (MISC) https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 -
Summary 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. ** DISPUTED ** 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.

30 Nov 2021, 20:17

Type Values Removed Values Added
CPE cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
cpe:2.3:a:netapp:clustered_data_ontap:-:*:*:*:*:*:*:*
References (CONFIRM) https://security.netapp.com/advisory/ntap-20211014-0005/ - (CONFIRM) https://security.netapp.com/advisory/ntap-20211014-0005/ - Third Party Advisory

14 Oct 2021, 09:15

Type Values Removed Values Added
References
  • (CONFIRM) https://security.netapp.com/advisory/ntap-20211014-0005/ -

30 Sep 2021, 19:40

Type Values Removed Values Added
CPE cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
CWE NVD-CWE-Other
CVSS v2 : unknown
v3 : unknown 		v2 : 4.3
v3 : 5.3
References (MISC) https://rushter.com/blog/public-ssh-keys/ - (MISC) https://rushter.com/blog/public-ssh-keys/ - Exploit, Third Party Advisory
References (MISC) https://github.com/openssh/openssh-portable/pull/270 - (MISC) https://github.com/openssh/openssh-portable/pull/270 - Patch, Third Party Advisory
References (MISC) https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 - (MISC) https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 - Exploit, Third Party Advisory
References (MISC) https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak - (MISC) https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak - Third Party Advisory

15 Sep 2021, 20:20

Type Values Removed Values Added
New CVE
Information

Published : 2021-09-15 20:15

Updated : 2024-08-06 04:16

NVD link : CVE-2016-20012

Mitre link : CVE-2016-20012

CVE.ORG link : CVE-2016-20012

JSON object : View

Products Affected

netapp

  • clustered_data_ontap
  • hci_management_node
  • solidfire
  • ontap_select_deploy_administration_utility

openbsd

  • openssh
CWE
NVD-CWE-Other