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Nuclei Templates

SMB Signing Not Required

ID: smb-signing-not-required

Severity: high

Author: princechaddha

Tags: windows,smb,signing,code,windows-audit

Description

Section titled “Description”

Checks if SMB signing is not required, exposing SMB communications to man-in-the-middle attacks.

YAML Source

Section titled “YAML Source”
id: smb-signing-not-required


info:
  name: SMB Signing Not Required
  author: princechaddha
  severity: high
  description: Checks if SMB signing is not required, exposing SMB communications to man-in-the-middle attacks.
  impact: |
    Not requiring SMB signing allows for tampering of data in transit, enabling man-in-the-middle attacks.
  remediation: |
    Configure SMB to require security signatures for communication.
  tags: windows,smb,signing,code,windows-audit


self-contained: true


code:
  - pre-condition: |
      IsWindows();
    engine:
      - powershell
      - powershell.exe
    args:
      - -ExecutionPolicy
      - Bypass
    pattern: "*.ps1"
    source: |
      Get-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters' -Name 'RequireSecuritySignature'


    matchers:
      - type: word
        words:
          - "requiresecuritysignature : 0"
# digest: 4a0a00473045022100b2dcff88005d225121f7d83c8b8c4478dff859539f616ee196f00e9bacfc3c270220111b6a93b764bcb732e77880347e664790eca1b9e30c14d54ecdc08837fc2c24:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "code/windows/audit/smb-signing-not-required.yaml"

View on Github