Detections
Analytics

OpenSSH < 8.0

medium Nessus Plugin ID 159491

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Synopsis

The SSH server running on the remote host is affected by multiple vulnerabilities.

Description

According to its banner, the version of OpenSSH running on the remote host is prior to 8.0. It is, therefore, affected by the following vulnerabilities:

 - A permission bypass vulnerability due to improper directory name validation. An unauthenticated, remote attacker can exploit this, with a specially crafted scp server, to change the permission of a directory on the client. (CVE-2018-20685)

 - Multiple arbitrary file downloads due to improper validation of object name and stderr output. An unauthenticated remote attacker can exploit this, with a specially crafted scp server, to include additional hidden files in the transfer. (CVE-2019-6109, CVE-2019-6110)

 - An arbitrary file write vulnerability due to improper object name validation. An unauthenticated, remote attacker can exploit this, with a specially crafted scp server, to overwrite arbitrary files in the client directory. (CVE-2019-6111)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to OpenSSH version 8.0 or later.

See Also

https://sintonen.fi/advisories/scp-client-multiple-vulnerabilities.txt

https://www.openssh.com/txt/release-8.0

Plugin Details

Severity: Medium

ID: 159491

File Name: openssh_80.nasl

Version: 1.5

Type: remote

Family: Misc.

Published: 4/4/2022

Updated: 3/27/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 5.8

Temporal Score: 4.5

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

CVSS Score Source: CVE-2019-6111

CVSS v3

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 6.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

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

CVSS Score Source: CVE-2019-6110

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: installed_sw/OpenSSH

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 4/17/2019

Vulnerability Publication Date: 8/8/2018

Reference Information

CVE: CVE-2018-20685, CVE-2019-6109, CVE-2019-6110, CVE-2019-6111