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OpenSSH < 7.5

medium Nessus Plugin ID 99359

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Synopsis

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

Description

According to its banner, the version of OpenSSH running on the remote host is prior to 7.5. It is, therefore, affected by an information disclosure vulnerability :

 - An unspecified timing flaw exists in the CBC padding oracle countermeasures, within the ssh and sshd functions, that allows an unauthenticated, remote attacker to disclose potentially sensitive information.
 Note that the OpenSSH client disables CBC ciphers by default. However, sshd offers them as lowest-preference options, which will be removed by default in a future release.

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 7.5 or later.

See Also

http://www.openssh.com/txt/release-7.5

Plugin Details

Severity: Medium

ID: 99359

File Name: openssh_75.nasl

Version: 1.6

Type: remote

Family: Misc.

Published: 4/13/2017

Updated: 3/27/2024

Supported Sensors: Nessus

Risk Information

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

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

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

Vulnerability Information

CPE: cpe:/a:openbsd:openssh

Required KB Items: installed_sw/OpenSSH

Patch Publication Date: 3/20/2017

Vulnerability Publication Date: 9/1/2016