OpenSSH < 7.5

Medium Nessus Plugin ID 99359


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


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. (VulnDB 144000)

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


Upgrade to OpenSSH version 7.5 or later.

See Also

Plugin Details

Severity: Medium

ID: 99359

File Name: openssh_75.nasl

Version: $Revision: 1.2 $

Type: remote

Family: Misc.

Published: 2017/04/13

Modified: 2017/04/17

Dependencies: 10267

Risk Information

Risk Factor: Medium


Base Score: 5

Temporal Score: 3.7

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C


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: Settings/ParanoidReport

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2017/03/20

Vulnerability Publication Date: 2016/09/01

Reference Information

OSVDB: 144000