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Product: 3DSecure 2.0
Manufacturer: Redsys
Affected Version(s): 3DSecure 2.0 3DS Authorization Challenge
Tested Version(s): 3DSecure 2.0 3DS Authorization Challenge
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-2024-25283

Overview:
Multiple reflected Cross-Site Scripting (XSS) vulnerabilities exist in the 3DS Authorization Challenge of 3DSecure 2.0. 
These flaws allow attackers to inject arbitrary web scripts, CSS, or HTML through the manipulation of the params 
parameter in the request URL.

Vulnerability Details:
The params parameter in the 3DS Authorization Challenge is vulnerable to code injection. This flaw occurs because the 
value entered into the parameter is not sanitized, allowing attackers to create new HTML elements in the DOM and 
execute malicious code in the victim's browser.

Proof of Concept (PoC):
An attacker can alter the base64-encoded params parameter in the request URL to inject arbitrary code. Example:

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

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

Discoverer:
Reported by Rubén López Herrera

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Current thread:

• CVE-2024-25283 - RedSys - Multiple reflected Cross-Site Scripting (XSS) vulnerabilities exist in the 3DS Authorization Challenge of 3DSecure 2.0 RUBEN LOPEZ HERRERA (Sep 11)