vBulletin Backdoor - Detect

ID: vbulletin-backdoor

Severity: high

Author: MaStErCho

Tags: backdoor,php,vbulletin,rce

Description

YAML Source

id: vbulletin-backdoor

info:
  name: vBulletin Backdoor - Detect
  author: MaStErCho
  severity: high
  reference:
    - https://github.com/OWASP/vbscan
    - https://blog.sucuri.net/2017/01/vbulletin-malware-hackers-compete-backdoor-control.html
  metadata:
    max-request: 21
  tags: backdoor,php,vbulletin,rce

flow: http(1) && http(2)

variables:
  num: "999999999"

http:
  - method: GET
    path:
      - '{{BaseURL}}'

    matchers:
      - type: word
        part: body
        words:
          - "content=\"vBulletin"
          - "id=\"vbulletin_css"
          - "clientscript/vbulletin"
          - "vBulletin_init"
        condition: or
        internal: true

  - method: GET
    path:
      - '{{BaseURL}}/faq.php?cmd=echo%20-n%20{{num}}|md5sum'
      - '{{BaseURL}}/forum.php?x=shell_exec&y=echo%20-n%20{{num}}|md5sum'
      - '{{BaseURL}}/{{paths}}/faq.php?cmd=echo%20-n%20{{num}}|md5sum'
      - '{{BaseURL}}/{{paths}}/forum.php?x=shell_exec&y=echo%20-n%20{{num}}|md5sum'

    payloads:
      paths:
        - 'boards'
        - 'board'
        - 'forum'
        - 'forums'
        - 'vb'

    stop-at-first-match: true
    host-redirects: true
    max-redirects: 3
    matchers:
      - type: dsl
        dsl:
          - "contains(body, '{{md5(num)}}')"
          - "status_code == 200"
        condition: and
# digest: 4b0a00483046022100fc9d9fec38712f5956702b7671012d34e393f7734de77f86dc8997542b29951b022100837492912c868890c4eac03e42f9f598c26e26c835c363f11cd2cf966a21c221:922c64590222798bb761d5b6d8e72950

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 "http/vulnerabilities/vbulletin/vbulletin-backdoor.yaml"

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