CVE-2016-20012
5.3 MEDIUMOpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SS...
Published: 2021-09-15 · Last updated: 2026-05-29
Severity and scoring
- CVSS
- 5.3 MEDIUM
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- CWE
- CWE-203
Affected products
| Vendor | Product |
|---|---|
| netapp | clustered_data_ontap, hci_management_node, ontap_select_deploy_administration_utility |
| openbsd | clustered_data_ontap, hci_management_node, ontap_select_deploy_administration_utility |
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
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2016-20012
- [Exploit reference]https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265
- [Patch]https://github.com/openssh/openssh-portable/pull/270
- [Other]https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
- [Other]https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
- [Exploit reference]https://rushter.com/blog/public-ssh-keys/
- [Other]https://security.netapp.com/advisory/ntap-20211014-0005/
- [Other]https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak
- [Other]https://www.openwall.com/lists/oss-security/2018/08/24/1
- [Exploit reference]https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265
- [Patch]https://github.com/openssh/openssh-portable/pull/270
- [Other]https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
- [Other]https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
- [Exploit reference]https://rushter.com/blog/public-ssh-keys/
- [Other]https://security.netapp.com/advisory/ntap-20211014-0005/
- [Other]https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak
- [Other]https://www.openwall.com/lists/oss-security/2018/08/24/1
- [Exploit reference]https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265
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