[FD] CVE-2024-25282 - RedSys - 3DSecure 2.0 is vulnerable to Cross-Site Scripting (XSS) in its 3DSMethod Authentication

[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-2024-25282

Overview:
3DSecure 2.0 is vulnerable to Cross-Site Scripting (XSS) in its 3DSMethod 
Authentication. This vulnerability allows remote attackers to hijack the form 
action and change the destination website via the params parameter, which is 
base64 encoded and improperly sanitized.

Vulnerability Details:
The issue arises because the params parameter in the 3DSMethod Authentication 
is not properly sanitized or validated before being processed. Attackers can 
inject arbitrary HTML elements into the DOM, modifying the website's appearance 
or executing malicious code in the victim's browser. Additionally, the 
integrity of the base64-encoded information is not checked, making it 
vulnerable to manipulation in a man-in-the-middle attack.

Proof of Concept (PoC):
By altering the params parameter in the request URL, an attacker can modify 
base64-encoded values and inject malicious code. For example:

https://[REDACTED]/[REDACTED]/rest/online/[REDACTED]/redirect?action=challenge&txn=[REDACTED]&params=[REDACTED]";

Solution:
Currently, no solution is available. Redsys has been notified of the issue, but 
no patch has been released as of the date of this advisory.

References:
OWASP Web Security Testing Guide: Reflected Cross-Site Scripting

Discoverer:
Reported by Rubén López Herrera

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