QID 38905

Date Published: 2023-07-24

QID 38905: OpenSSH Improper Authorization Vulnerability (CVE-2017-15906)

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

The process_open function in sftp-server.c in OpenSSH before 7.6 does not properly prevent write operations in readonly mode, which allows attackers to create zero-length files.

Affected Versions:
OpenSSH versions prior to 7.6

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

Successful exploitation allows a remote attacker having readonly access to create zero-length files resulting in improper authorization and lack of Integrity.

CVSS V3 rated as Medium - 5.3 severity.

CVSS V2 rated as Medium - 5 severity.

Solution

Customers are advised to upgrade to OpenSSH 7.6 or later to remediate these vulnerabilities.

Vendor References

OpenSSH 7.6 - www.openssh.com/txt/release-7.6

CVEs related to QID 38905

CVE-2017-15906 |

Software Advisories

Advisory ID	Software	Component	Link
OpenSSH 7.6			www.openssh.com/txt/release-7.6

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