CVE-2016-20012
OpenSSH User Enumeration via Invalid Login Attempts
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
INFO
Published Date :
Sept. 15, 2021, 8:15 p.m.
Last Modified :
Aug. 6, 2024, 4:16 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
1.4
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2016-20012 has a 10 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2016-20012
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2016-20012.
| URL | 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 |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Python
DockerLab - Machine
Máquina DockerLab
terraform-rockylinux-libvirt-kvm
HCL
Terraform to install AlmaLinux 9 to KVM based systems using libvirt provider
HCL Smarty
Nmap's XML result parse and NVD's CPE correlation to search CVE.
Python
Terraform to Create Rocky Linux on KVM/Libvirt
HCL
Walkthrough and Writeups for the HackTheBox Penetration Lab Testing Environment
Easily scan for CVEs using nmap.
cve nmap portscanning shell shellscript automation
Shell
IOT Search Engine Scanner/Crawler/Scraper
binaryedge iot-platform searchengine shodan-api shodan-search hunterhow iot-search iotengine
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2016-20012 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2016-20012 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Aug. 06, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
May. 17, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Apr. 11, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Mar. 21, 2024
Action Type Old Value New Value Added Tag MITRE disputed -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Changed 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. 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 -
Modified Analysis by [email protected]
Apr. 18, 2022
Action Type Old Value New Value Changed Reference Type https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 No Types Assigned https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 Issue Tracking, Third Party Advisory Changed Reference Type https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 No Types Assigned https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 Issue Tracking, Third Party Advisory Changed Reference Type https://www.openwall.com/lists/oss-security/2018/08/24/1 No Types Assigned https://www.openwall.com/lists/oss-security/2018/08/24/1 Mailing List, Third Party Advisory -
CVE Modified by [email protected]
Feb. 24, 2022
Action Type Old Value New Value Changed 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. ** 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. Added Reference https://github.com/openssh/openssh-portable/pull/270#issuecomment-943909185 [No Types Assigned] Added Reference https://github.com/openssh/openssh-portable/pull/270#issuecomment-920577097 [No Types Assigned] Added Reference https://www.openwall.com/lists/oss-security/2018/08/24/1 [No Types Assigned] -
Modified Analysis by [email protected]
Nov. 30, 2021
Action Type Old Value New Value Changed Reference Type https://security.netapp.com/advisory/ntap-20211014-0005/ No Types Assigned https://security.netapp.com/advisory/ntap-20211014-0005/ Third Party Advisory Added CPE Configuration 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:-:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Oct. 14, 2021
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20211014-0005/ [No Types Assigned] -
Initial Analysis by [email protected]
Sep. 30, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:P/I:N/A:N) Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Changed Reference Type https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 No Types Assigned https://github.com/openssh/openssh-portable/blob/d0fffc88c8fe90c1815c6f4097bc8cbcabc0f3dd/auth2-pubkey.c#L261-L265 Exploit, Third Party Advisory Changed Reference Type https://github.com/openssh/openssh-portable/pull/270 No Types Assigned https://github.com/openssh/openssh-portable/pull/270 Patch, Third Party Advisory Changed Reference Type https://rushter.com/blog/public-ssh-keys/ No Types Assigned https://rushter.com/blog/public-ssh-keys/ Exploit, Third Party Advisory Changed Reference Type https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak No Types Assigned https://utcc.utoronto.ca/~cks/space/blog/tech/SSHKeysAreInfoLeak Third Party Advisory Added CWE NIST NVD-CWE-Other Added CPE Configuration OR *cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* versions up to (including) 8.7
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2016-20012 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2016-20012
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
2.11 }} 1.28%
score
0.89401
percentile