QID 38903

Date Published: 2023-07-19

QID 38903: OpenSSH Probable User Enumeration Vulnerability

OpenSSH (OpenBSD Secure Shell) is a set of computer programs providing encrypted communication sessions over a computer network using the SSH protocol.

OpenSSH contains the following vulnerabilities:
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.

Affected Versions:
OpenSSH versions prior to 8.8

QID Detection Logic:
This unauthenticated detection works by reviewing the version of the OpenSSH service.

Successful exploitation allows a remote attacker to test and confirm if a certain combination of username and public key is known to an SSH server.

CVSS V3 rated as Medium - 5.3 severity.

CVSS V2 rated as Medium - 4.3 severity.

Solution

Customers are advised to upgrade to OpenSSH 8.8 or later to remediate these vulnerabilities.

Vendor References

OpenSSH 8.8 - www.openssh.com/txt/release-8.8

CVEs related to QID 38903

CVE-2016-20012 |

Software Advisories

Advisory ID	Software	Component	Link
OpenSSH 8.8 or later			www.openssh.com/

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