CVE-2020-15233: OAuth2 Redirect URL validity does not respect query parameters and character casing for loopback addresses
ORY Fosite is a security first OAuth2 & OpenID Connect framework for Go. In Fosite from version 0.30.2 and before version 0.34.1, there is an issue in which an an attacker can override the registered redirect URL by performing an OAuth flow and requesting a redirect URL that is to the loopback adapter. Attackers can provide both custom URL query parameters to their loopback redirect URL, as well as actually overriding the host of the registered redirect URL. These attacks are only applicable in scenarios where the attacker has access over the loopback interface. This vulnerability has been patched in ORY Fosite v0.34.1.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2020-15233?
CVE-2020-15233 is classified as a medium severity vulnerability.
How do I fix CVE-2020-15233?
To mitigate CVE-2020-15233, upgrade Fosite to version 0.34.1 or later.
What impact does CVE-2020-15233 have on my application?
CVE-2020-15233 allows attackers to override the registered redirect URL during an OAuth flow, posing a security risk.
What versions of Fosite are affected by CVE-2020-15233?
Fosite versions from 0.30.2 to before 0.34.1 are affected by CVE-2020-15233.
Is CVE-2020-15233 exploitable in production environments?
Yes, CVE-2020-15233 can be exploited in production environments if the vulnerable versions of Fosite are in use.