Open redirect in Kotlin Ktor - CVE-2019-19703

Detailed vulnerability description

The vulnerability allows a remote attacker to redirect victims to arbitrary URL.

The vulnerability exists due to improper sanitization of user-supplied data. A remote attacker can create a link that leads to a trusted website, however, when clicked, redirects the victim to arbitrary domain.

Successful exploitation of this vulnerability may allow a remote attacker to perform a phishing attack and steal potentially sensitive information.

How to mitigate CVE-2019-19703

Sources

• https://github.com/ktorio/ktor/issues/1467
• https://blog.jetbrains.com/blog/2020/01/24/jetbrains-security-bulletin-q4-2019/