cve/2016/CVE-2016-20012.md

### [CVE-2016-20012](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-20012)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

** 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.

### POC

#### Reference
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097
- https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185
- https://rushter.com/blog/public-ssh-keys/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/Totes5706/TotesHTB
- https://github.com/accalina/crowflag
- https://github.com/firatesatoglu/iot-searchengine
- https://github.com/firatesatoglu/shodanSearch
- https://github.com/omerfsen/terraform-almalinux-libvirt
- https://github.com/omerfsen/terraform-rockylinux-libvirt
- https://github.com/phx/cvescan
- https://github.com/vhgalvez/terraform-rockylinux-libvirt-kvm