Input validation error in OpenSSH - CVE-2015-6563

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Main Vulnerability Database Vulnerabilities #VU33998

Input validation error in OpenSSH - CVE-2015-6563

Published: August 5, 2020


Vulnerability identifier: #VU33998
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2015-6563
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability: No public exploit available
Vendor: OpenSSH
Affected software:
OpenSSH

Detailed vulnerability description

The vulnerability allows a local user to impersonate other users on the system.

The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.


How to mitigate CVE-2015-6563

Install updates from vendor's website.

Sources