CVE-2020-5233 : Security Advisory and Response

OAuth2 Proxy before version 5.0 has an open redirect vulnerability that could allow attackers to harvest authentication tokens.

Understanding CVE-2020-5233

OAuth2 Proxy is affected by an open redirect vulnerability that has been assigned CVE-2020-5233.

What is CVE-2020-5233?

OAuth2 Proxy before version 5.0 is susceptible to an open redirect vulnerability, potentially leading to the silent harvesting of authentication tokens by malicious actors.

The Impact of CVE-2020-5233

The vulnerability has a CVSS base score of 5.9, with medium severity. It could result in high integrity impact and low confidentiality impact.

Technical Details of CVE-2020-5233

OAuth2 Proxy's open redirect vulnerability is detailed below.

Vulnerability Description

The vulnerability allows attackers to conduct open redirects, posing a risk of token harvesting.

Affected Systems and Versions

Product: OAuth2 Proxy
Vendor: pusher
Versions Affected: < 5.0.0

Exploitation Mechanism

The vulnerability can be exploited through network-based attacks requiring low privileges and user interaction.

Mitigation and Prevention

Steps to mitigate the CVE-2020-5233 vulnerability are crucial for system security.

Immediate Steps to Take

Upgrade OAuth2 Proxy to version 5.0 or higher to apply the patch.
Monitor and restrict user interactions to prevent exploitation.

Long-Term Security Practices

Regularly update and patch software to address security vulnerabilities.
Implement network security measures to detect and prevent open redirect attacks.

Patching and Updates

Ensure timely installation of security patches and updates to protect against known vulnerabilities.