SMB Signing Not Required

ID: smb-signing

Severity: medium

Author: pussycat0x

Tags: js,network,smb,enum

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.

YAML Source

id: smb-signing

info:
  name: SMB Signing Not Required
  author: pussycat0x
  severity: medium
  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.
  reference:
    - https://www.tenable.com/plugins/nessus/57608
    - https://nmap.org/nsedoc/scripts/smb2-security-mode.html
  metadata:
    verified: true
    max-request: 1
    shodan-query: port:445
    product: dionaea
    vendor: dionaea
  tags: js,network,smb,enum
javascript:
  - pre-condition: |
      isPortOpen(Host,Port);
    code: |
      var m = require("nuclei/smb");
      var c = m.SMBClient();
      var response = c.ListSMBv2Metadata(Host, Port, User, Pass);
      Export(response);

    args:
      Host: "{{Host}}"
      Port: "445"
      User: "test"
      Pass: "test"

    matchers:
      - type: word
        words:
          - '"SigningEnabled": true'
          - '"SigningRequired": false'
        condition: and
# digest: 4b0a004830460221009942d4a45abcd95f6d0b7e2d7b0deff4c1237bfe605125aca48754e2b21ba17d022100a59ca41326e2ee54de7f574f961fddee7258c56a7138110ce63bc0d8a3caa1d5:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "javascript/misconfiguration/smb/smb-signing.yaml"

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