SSH Protocol Authentication Bypass (Remote Exploit Check)

Medium 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: Medium

ID: 118154

File Name: libssh_0_8_4_remote.nasl

Version: 1.16

Type: remote

Family: Misc.

Published: 2018/10/17

Updated: 2019/04/05

Dependencies: 17975

Risk Information

Risk Factor: Medium

CVSS Score Source: CVE-2018-10933

CVSS v2.0

Base Score: 6.4

Temporal Score: 5

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

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

CVSS v3.0

Base Score: 9.1

Temporal Score: 8.2

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 2018/10/16

Reference Information

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

BID: 105677, 106762

IAVA: 2018-A-0347