Improper Input Validation Affecting openssh-portable package, versions [,7.0)


Severity

Recommended
0.0
low
0
10

CVSS assessment made by Snyk's Security Team. Learn more

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-UNMANAGED-OPENSSHPORTABLE-2319327
  • published14 Dec 2021
  • disclosed24 Aug 2015
  • creditUnknown

Introduced: 24 Aug 2015

CVE-2015-6563  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade openssh-portable to version 7.0 or higher.

Overview

Affected versions of this package are vulnerable to Improper Input Validation. 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.

CVSS Scores

version 3.1