SSH Protocol Authentication Bypass (Remote Exploit Check)

high Nessus Plugin ID 118154

Synopsis

The remote server is vulnerable to an authentication bypass.

Description

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.

Solution

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

See Also

http://www.nessus.org/u?6f6b157e

http://www.nessus.org/u?505261f8

http://www.nessus.org/u?58a0f73d

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

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

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

CVSS v3

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