OpenSSH < 5.0 X11 Forwarding Local Session Hijacking

Medium Nessus Network Monitor Plugin ID 4459

Synopsis

The remote SSH service is prone to an X11 session hijacking vulnerability.

Description

According to its banner, the version of SSH installed on the remote host is older than 5.0. Such versions may allow a local user to hijack X11 sessions because it improperly binds TCP ports on the local IPv6 interface if the corresponding ports on the IPv4 interface are in use.

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 5.0 or higher.

See Also

http://www.openssh.org/txt/release-5.0

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=463011

Plugin Details

Severity: Medium

ID: 4459

File Name: 4459.prm

Family: SSH

Published: 2008/04/03

Modified: 2016/11/23

Dependencies: 1997, 3059

Nessus ID: 31737

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 4.6

Temporal Score: 3.8

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

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

CVSSv3

Base Score: 5.9

Temporal Score: 5.4

Vector: CVSS3#AV:L/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-2008-1483

BID: 28444