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OpenSSH < 7.2 Untrusted X11 Forwarding Fallback Security Bypass

critical Nessus Plugin ID 90022

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Synopsis

The SSH server running on the remote host is affected by a security bypass vulnerability.

Description

According to its banner, the version of OpenSSH running on the remote host is prior to 7.2. It is, therefore, affected by a security bypass vulnerability due to a flaw in ssh(1) that is triggered when it falls back from untrusted X11 forwarding to trusted forwarding when the SECURITY extension is disabled by the X server. This can result in untrusted X11 connections that can be exploited by a remote attacker.

Solution

Upgrade to OpenSSH version 7.2 or later.

See Also

http://www.openssh.com/txt/release-7.2

Plugin Details

Severity: Critical

ID: 90022

File Name: openssh_72.nasl

Version: 1.10

Type: remote

Family: Misc.

Published: 3/18/2016

Updated: 3/27/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2016-1908

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: installed_sw/OpenSSH

Exploit Ease: No known exploits are available

Patch Publication Date: 2/29/2016

Vulnerability Publication Date: 2/29/2016

Reference Information

CVE: CVE-2016-1908