CVE-2020-5206 Explained : Impact and Mitigation
Learn about CVE-2020-5206, an authentication bypass vulnerability in Opencast allowing unauthorized access to system administrator privileges. Find mitigation steps and update recommendations here.
In Opencast before 7.6 and 8.1, an attacker can exploit a vulnerability allowing the assumption of proper authentication for a user via a remember-me cookie, potentially gaining unauthorized access to non-public content.
Understanding CVE-2020-5206
This CVE involves an authentication bypass issue in Opencast versions prior to 7.6 and 8.1, enabling unauthorized access to system administrator privileges.
What is CVE-2020-5206?
The vulnerability in Opencast allows an attacker to impersonate a user by utilizing a remember-me cookie, leading to improper authentication and potential access to restricted content.
The Impact of CVE-2020-5206
The vulnerability poses a high severity risk with a CVSS base score of 8.7, allowing attackers to exploit improper authorization and gain unauthorized access to confidential information.
Technical Details of CVE-2020-5206
This section provides detailed technical insights into the vulnerability.
Vulnerability Description
The issue arises from Opencast's mishandling of remember-me cookies, enabling attackers to assume the identity of system administrators and access non-public content.
Affected Systems and Versions
- Opencast versions prior to 7.6
- Opencast versions >= 8.0 and < 8.1
Exploitation Mechanism
- Attacker uses a remember-me cookie with an arbitrary username
- Exploits an endpoint allowing anonymous access
- Fakes a remember-me token to gain unauthorized access
Mitigation and Prevention
Effective strategies to mitigate and prevent exploitation of CVE-2020-5206.
Immediate Steps to Take
- Upgrade Opencast to version 7.6 or 8.1 where the issue is resolved
- Monitor system logs for suspicious activities
- Implement multi-factor authentication for enhanced security
Long-Term Security Practices
- Regularly review and update access control policies
- Conduct security training for system administrators and users
- Perform regular security audits and penetration testing
Patching and Updates
- Apply patches and updates provided by Opencast to address the vulnerability
- Stay informed about security advisories and best practices for secure authentication