CVE-2020-4037: Open Redirect in OAuth2 Proxy
In OAuth2 Proxy from version 5.1.1 and less than version 6.0.0, users can provide a redirect address for the proxy to send the authenticated user to at the end of the authentication flow. This is expected to be the original URL that the user was trying to access. This redirect URL is checked within the proxy and validated before redirecting the user to prevent malicious actors providing redirects to potentially harmful sites. This has been fixed in version 6.0.0.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2020-4037?
CVE-2020-4037 is considered a moderate severity vulnerability that can lead to open redirect attacks.
How do I fix CVE-2020-4037?
To fix CVE-2020-4037, upgrade OAuth2 Proxy to version 6.0.0 or later.
What systems are affected by CVE-2020-4037?
CVE-2020-4037 affects OAuth2 Proxy versions from 5.1.1 to less than 6.0.0.
What kind of attack can CVE-2020-4037 allow?
CVE-2020-4037 can allow attackers to redirect users to malicious URLs after authentication.
Is there a workaround for CVE-2020-4037?
Currently, the recommended solution for CVE-2020-4037 is to upgrade to the patched version, as no specific workarounds are advised.