Detections
Analytics

OpenSSH X11UseLocalhost X11 Forwarding Port Hijacking

low Nessus Plugin ID 44080

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Synopsis

The remote SSH service may be affected by an X11 forwarding port hijacking vulnerability.

Description

According to its banner, the version of SSH installed on the remote host is older than 5.1 and may allow a local user to hijack the X11 forwarding port. The application improperly sets the 'SO_REUSEADDR' socket option when the 'X11UseLocalhost' configuration option is disabled.

Note that most operating systems, when attempting to bind to a port that has previously been bound with the 'SO_REUSEADDR' option, will check that either the effective user-id matches the previous bind (common BSD-derived systems) or that the bind addresses do not overlap (Linux and Solaris). This is not the case with other operating systems such as HP-UX.

Solution

Upgrade to OpenSSH version 5.1 or later.

See Also

https://www.openssh.com/txt/release-5.1

Plugin Details

Severity: Low

ID: 44080

File Name: openssh_51.nasl

Version: 1.7

Type: remote

Family: Misc.

Published: 10/4/2011

Updated: 3/27/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Low

Base Score: 1.2

Temporal Score: 0.9

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: installed_sw/OpenSSH

Exploit Ease: No known exploits are available

Patch Publication Date: 7/21/2008

Vulnerability Publication Date: 7/21/2008

Reference Information

CVE: CVE-2008-3259

BID: 30339

CWE: 200