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Open Redirect in OAuth2 Proxy

Moderate severity GitHub Reviewed Published Jun 27, 2020 in oauth2-proxy/oauth2-proxy • Updated Jan 9, 2023

Package

gomod github.com/oauth2-proxy/oauth2-proxy (Go)

Affected versions

>= 5.1.1, < 6.0.0

Patched versions

6.0.0

Description

Impact

As 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.

References

@JoelSpeed JoelSpeed published to oauth2-proxy/oauth2-proxy Jun 27, 2020
Reviewed May 24, 2021
Published to the GitHub Advisory Database Dec 20, 2021
Last updated Jan 9, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS score

0.066%
(31st percentile)

Weaknesses

CVE ID

CVE-2020-4037

GHSA ID

GHSA-5m6c-jp6f-2vcv

Source code

No known source code
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