OpenSSH Client < 2.3.0 X11 Unauthorized Remote Forwarding

High Nessus Network Monitor Plugin ID 1979

Synopsis

The remote host is vulnerable to a flaw that allows attackers to retrieve sensitive files or data.

Description

The remote host is running OpenSSH SSH client older than 2.3.0. This version does not properly disable X11 or agent forwarding, which could allow a rogue SSH server to gain access to the X11 display of the client and eavesdrop X11 events.

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 version 2.3.0 or higher.

Plugin Details

Severity: High

ID: 1979

Family: SSH

Published: 2004/08/20

Modified: 2018/09/16

Dependencies: 1968

Nessus ID: 11343

Risk Information

Risk Factor: High

CVSSv2

Base Score: 7.5

Temporal Score: 6.2

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

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

CVSSv3

Base Score: 7.3

Temporal Score: 6.8

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

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Reference Information

CVE: CVE-2000-1169

BID: 1949