OpenSSH < 7.2 Untrusted X11 Forwarding Fallback Security Bypass

This script is Copyright (C) 2016 Tenable Network Security, Inc.


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.

See also :

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

Solution :

Upgrade to OpenSSH version 7.2 or later.

Risk factor :

Medium / CVSS Base Score : 4.3
(CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N)
CVSS Temporal Score : 3.2
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Misc.

Nessus Plugin ID: 90022 ()

Bugtraq ID:

CVE ID:

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