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Nuclei Templates

Null Session Allowed

ID: null-session-allowed

Severity: high

Author: princechaddha

Tags: windows,null-session,code,windows-audit

Description

Section titled “Description”

Checks if null sessions are allowed via any entry in the NullSessionPipes registry key, posing a security risk.

YAML Source

Section titled “YAML Source”
id: null-session-allowed


info:
  name: Null Session Allowed
  author: princechaddha
  severity: high
  description: Checks if null sessions are allowed via any entry in the NullSessionPipes registry key, posing a security risk.
  impact: |
    Allowing null sessions can lead to unauthorized access to network resources, increasing vulnerability to attacks.
  remediation: |
    Disable null sessions by ensuring no entries are allowed in the NullSessionPipes registry key.
  tags: windows,null-session,code,windows-audit


self-contained: true


code:
  - pre-condition: |
      IsWindows();
    engine:
      - powershell
      - powershell.exe
    args:
      - -ExecutionPolicy
      - Bypass
    pattern: "*.ps1"
    source: |
      if ((Get-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters' -Name 'NullSessionPipes').NullSessionPipes.Count -gt 0) { "Null sessions are allowed" }


    matchers:
      - type: word
        words:
          - "Null sessions are allowed"
# digest: 490a0046304402200857b8cbdd89ddbe3d1e2c0002b8a422f90a68413fc8983053bf4833254d07a902202627156eeabfa4cba4dbee4703258acf9c1429d617e6be517b508d4a257fc70c: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/null-session-allowed.yaml"

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