OpenSSH < 7.2p2 X11Forwarding xauth Command Injection

medium Nessus Plugin ID 90023

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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 7.2p2. It is, therefore, affected by a security bypass vulnerability due to improper sanitization of X11 authentication credentials. An authenticated, remote attacker can exploit this, via crafted credentials, to inject arbitrary xauth commands, resulting in gaining read and write access to arbitrary files, connecting to local ports, or performing further attacks on xauth itself. Note that exploiting this vulnerability requires X11Forwarding to have been enabled.

Solution

Upgrade to OpenSSH version 7.2p2 / 7.3 or later.

Plugin Details

Severity: Medium

ID: 90023

File Name: openssh_72p2.nasl

Version: 1.11

Type: remote

Family: Misc.

Published: 3/18/2016

Updated: 3/27/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.8

CVSS v2

Risk Factor: Medium

Base Score: 5.5

Temporal Score: 4.3

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

CVSS Score Source: CVE-2016-3115

CVSS v3

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5.8

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

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: installed_sw/OpenSSH

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/10/2016

Vulnerability Publication Date: 3/10/2016

Reference Information

CVE: CVE-2016-3115

Detections

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