SSH Protocol Authentication Bypass (Remote Exploit Check)

high Nessus Plugin ID 118154


The remote server is vulnerable to an authentication bypass.


The remote ssh server is vulnerable to an authentication bypass. An attacker can bypass authentication by presenting SSH2_MSG_USERAUTH_SUCCESS message in place of the SSH2_MSG_USERAUTH_REQUEST method that normally would initiate authentication.

Note: This vulnerability was disclosed in a libssh advisory but has also been observed as applicable to other applications and software packages.


Upgrade to libssh 0.7.6 / 0.8.4 or later, if applicable. Otherwise, contact your product vendor.

See Also

Plugin Details

Severity: High

ID: 118154

File Name: libssh_0_8_4_remote.nasl

Version: 1.20

Type: remote

Family: Misc.

Published: 10/17/2018

Updated: 2/8/2022

Risk Information


Risk Factor: Medium

Score: 6.7


Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.1

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

Temporal Vector: E:POC/RL:OF/RC:C

CVSS Score Source: CVE-2018-1000805


Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 10/16/2018

Reference Information

CVE: CVE-2018-10933, CVE-2018-1000805

BID: 105677, 106762

IAVA: 2018-A-0347-S