SMB Signing not required

medium Nessus Plugin ID 57608

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Synopsis

Signing is not required on the remote SMB server.

Description

Signing is not required on the remote SMB server. An unauthenticated, remote attacker can exploit this to conduct man-in-the-middle attacks against the SMB server.

Solution

Enforce message signing in the host's configuration. On Windows, this is found in the policy setting 'Microsoft network server: Digitally sign communications (always)'. On Samba, the setting is called 'server signing'. See the 'see also' links for further details.

Plugin Details

Severity: Medium

ID: 57608

File Name: smb_signing_disabled.nasl

Version: 1.19

Type: remote

Family: Misc.

Published: 1/19/2012

Updated: 3/15/2021

Risk Information

CVSS Score Rationale: Based on analysis of vulnerability

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

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

CVSS Score Source: manual

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

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

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

Vulnerability Information

CPE: cpe:/o:microsoft:windows, cpe:/a:samba:samba

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 1/17/2012