QID 38907

Date Published: 2023-07-24

QID 38907: OpenSSH User Enumeration Vulnerability (CVE-2016-6210)

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

When SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.

Affected Versions:
OpenSSH versions prior to 7.3

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

Successful exploitation allows a remote attacker to obtain user information affecting confidentiality.

  • CVSS V3 rated as Medium - 5.9 severity.
  • CVSS V2 rated as Medium - 4.3 severity.
    • Solution
    Customers are advised to upgrade to OpenSSH 7.3 or later to remediate these vulnerabilities.
    Vendor References

    CVEs related to QID 38907

    CVE-2016-6210 |
    Software Advisories
    Advisory ID Software Component Link
    OpenSSH 7.3 URL Logo www.openssh.com/txt/release-7.3
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