Vulnerability Description
OAuth2 Proxy is an open-source reverse proxy and static file server that provides authentication using Providers (Google, GitHub, and others) to validate accounts by email, domain or group. In OAuth2 Proxy before version 7.0.0, for users that use the whitelist domain feature, a domain that ended in a similar way to the intended domain could have been allowed as a redirect. For example, if a whitelist domain was configured for ".example.com", the intention is that subdomains of example.com are allowed. Instead, "example.com" and "badexample.com" could also match. This is fixed in version 7.0.0 onwards. As a workaround, one can disable the whitelist domain feature and run separate OAuth2 Proxy instances for each subdomain.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Oauth2 Proxy Project | Oauth2 Proxy | < 7.0.0 |
Related Weaknesses (CWE)
References
- https://github.com/oauth2-proxy/oauth2-proxy/commit/780ae4f3c99b579cb2ea9845121cPatchThird Party Advisory
- https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.0.0Release NotesThird Party Advisory
- https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-4mf2-f3wh-ExploitThird Party Advisory
- https://pkg.go.dev/github.com/oauth2-proxy/oauth2-proxy/v7ProductThird Party Advisory
- https://github.com/oauth2-proxy/oauth2-proxy/commit/780ae4f3c99b579cb2ea9845121cPatchThird Party Advisory
- https://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.0.0Release NotesThird Party Advisory
- https://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-4mf2-f3wh-ExploitThird Party Advisory
- https://pkg.go.dev/github.com/oauth2-proxy/oauth2-proxy/v7ProductThird Party Advisory
FAQ
What is CVE-2021-21291?
CVE-2021-21291 is a vulnerability with a CVSS score of 4.7 (MEDIUM). OAuth2 Proxy is an open-source reverse proxy and static file server that provides authentication using Providers (Google, GitHub, and others) to validate accounts by email, domain or group. In OAuth2 ...
How severe is CVE-2021-21291?
CVE-2021-21291 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-21291?
Check the references section above for vendor advisories and patch information. Affected products include: Oauth2 Proxy Project Oauth2 Proxy.