OpenSSH < 6.6 Remote Restriction Bypass Vulnerability

Low Nessus Network Monitor Plugin ID 8169

Synopsis

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

Description

Versions of OpenSSH server before 6.6 are unpatched for a restriction bypass vulnerability related to wildcard usage in the 'AcceptEnv' configuration setting within sshd_config. This could be leveraged by an attacker to bypass environment restrictions via a specially crafted request.

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 6.6 or later.

See Also

https://bugzilla.redhat.com/show_bug.cgi?id=1077843

http://www.openssh.com/txt/release-6.6

Plugin Details

Severity: Low

ID: 8169

File Name: 8169.prm

Family: SSH

Published: 2014/03/24

Modified: 2016/11/23

Dependencies: 1997

Risk Information

Risk Factor: Low

CVSSv2

Base Score: 2.1

Temporal Score: 1.8

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

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

CVSSv3

Base Score: 3

Temporal Score: 2.8

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

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Patch Publication Date: 2014/03/21

Vulnerability Publication Date: 2014/03/21

Reference Information

CVE: CVE-2014-2532

BID: 66355