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OpenSSH < 7.8

medium Nessus Plugin ID 159490

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Synopsis

The SSH server running on the remote host is affected by a information disclosure vulnerability.

Description

According to its banner, the version of OpenSSH running on the remote host is prior to 7.8. It is, therefore, affected by an information disclosure vulnerability in the auth2-gss.c, auth2-hostbased.c, and auth2-pubkey due to not delaying for an invalid authenticating user. An unauthenticated, remote attacker can exploit this, via a malformed packet, to potentially enumerate users.

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 7.8 or later.

See Also

https://www.openwall.com/lists/oss-security/2018/08/15/5

https://www.openssh.com/txt/release-7.8

Plugin Details

Severity: Medium

ID: 159490

File Name: openssh_78.nasl

Version: 1.6

Type: remote

Family: Misc.

Published: 4/4/2022

Updated: 3/27/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 4.4

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

CVSS Score Source: CVE-2018-15473

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 5.1

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

Temporal Vector: CVSS:3.0/E:H/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: 8/24/2018

Vulnerability Publication Date: 8/15/2018

Exploitable With

CANVAS (CANVAS)

Reference Information

CVE: CVE-2018-15473