OpenSSH < 7.1 PermitRootLogin Bypass Vulnerability

Low Nessus Network Monitor Plugin ID 9310

Synopsis

The remote SSH server may be affected by a restriction bypass vulnerability.

Description

OpenSSH contains a logic error in 'PermitRootLogin=' prohibit-password/without-password that is triggered when certain compile-time configurations are used allowing authentication to occur over SSH when it should not be, though the attacker would still require knowledge of valid credentials.

Note: PVS has solely relied on the banner of the SSH client to perform this check. Any backported patches or workarounds such as recompiling or edited configurations are not observable through the banner.

Solution

Upgrade to OpenSSH version 7.1 or later.

See Also

http://www.openssh.com/txt/release-7.1

Plugin Details

Severity: Low

ID: 9310

Family: SSH

Published: 2016/04/22

Modified: 2018/09/16

Dependencies: 1997

Nessus ID: 85690

Risk Information

Risk Factor: Low

CVSSv2

Base Score: 2.6

Temporal Score: 1.9

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSSv3

Base Score: 3.7

Temporal Score: 3.2

Vector: CVSS3#AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Temporal Vector: CVSS3#E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Patch Publication Date: 2015/08/21

Vulnerability Publication Date: 2015/08/21