Open Redirect in Oauth2 Proxy
CVE-2020-4037
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.
Vulnerability class: Open Redirect
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.009 (59.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- Oauth2 Proxy — versions >= 5.1.1, < 6.0.0
- Oauth2 Proxy Project
Weakness classification (CWE)
References
- github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-5m6c-jp6f-2vcv (Third Party Advisory)
- github.com/oauth2-proxy/oauth2-proxy/commit/ee5662e0f5001d76ec76562bb605abbd07c… (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-4037?
- CVE-2020-4037 is a medium-severity vulnerability in Oauth2 Proxy, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2020-06-29.
- How severe is CVE-2020-4037?
- Medium severity. CVSS v3 base score is 4.3 out of 10.