CVE-2020-26276 Explained : Impact and Mitigation
Learn about CVE-2020-26276, a critical SAML authentication vulnerability in Fleet before version 3.5.1. Understand the impact, technical details, affected systems, and mitigation steps.
Fleet is an open-source osquery manager that was affected by a SAML authentication vulnerability before version 3.5.1. This vulnerability allowed attackers to manipulate a valid SAML response, potentially leading to unverified logins from a SAML IdP.
Understanding CVE-2020-26276
In this section, we will delve into the details of the SAML authentication vulnerability in Fleet.
What is CVE-2020-26276?
CVE-2020-26276 is a critical vulnerability in Fleet that could enable unverified logins from a SAML IdP due to issues in Go's standard library XML parsing.
The Impact of CVE-2020-26276
The vulnerability has a base severity score of 10 (Critical) according to CVSS v3.1 metrics. It can lead to high impacts on confidentiality, integrity, and availability, with a low attack complexity.
Technical Details of CVE-2020-26276
Let's explore the technical aspects of the SAML authentication vulnerability in Fleet.
Vulnerability Description
The vulnerability in Fleet before version 3.5.1 allowed attackers to modify trusted documents by manipulating a valid SAML response, potentially enabling unverified logins.
Affected Systems and Versions
- Product: Fleet
- Vendor: FleetDM
- Versions Affected: < 3.5.1
Exploitation Mechanism
The vulnerability stemmed from issues in Go's standard library XML parsing, which could be exploited by attackers to tamper with SAML responses.
Mitigation and Prevention
To address the CVE-2020-26276 vulnerability in Fleet, users should take immediate steps and adopt long-term security practices.
Immediate Steps to Take
- Upgrade Fleet to version 3.5.1, where the issue is patched.
- If upgrading is not feasible, disable SSO authentication in Fleet to mitigate the risk.
Long-Term Security Practices
- Regularly monitor security advisories and updates for Fleet.
- Implement strong authentication mechanisms and access controls.
Patching and Updates
Stay informed about security patches and updates released by Fleet to address vulnerabilities like CVE-2020-26276.