CVE-2020-5275 : What You Need to Know

A vulnerability in symfony/security-http versions before 4.4.7 and 5.0.7 could allow improper authorization due to a flaw in the unanimous strategy of the Firewall configuration.

Understanding CVE-2020-5275

This CVE details a security issue in Symfony affecting versions prior to 4.4.7 and 5.0.7.

What is CVE-2020-5275?

In Symfony's security component, a Firewall configured with a unanimous strategy may not enforce unanimous decisions as expected, potentially leading to improper authorization.

The Impact of CVE-2020-5275

The vulnerability could result in high confidentiality impact and requires user interaction for exploitation, with a CVSS base score of 7.6 (High severity).

Technical Details of CVE-2020-5275

This section provides more technical insights into the vulnerability.

Vulnerability Description

When a Firewall in Symfony checks access control rules, it may stop evaluating attributes prematurely, affecting the unanimous strategy's enforcement.

Affected Systems and Versions

Product: Symfony
Vendor: Symfony
Versions Affected:
= 4.4.0, < 4.4.7

= 5.0.0, < 5.0.7

Exploitation Mechanism

The issue arises from the Firewall's handling of access control rules, where premature attribute evaluation can lead to improper authorization.

Mitigation and Prevention

Protecting systems from CVE-2020-5275 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update Symfony to versions 4.4.7 or 5.0.7, where the issue is patched.
Monitor security advisories for any future vulnerabilities.

Long-Term Security Practices

Regularly review and update access control configurations.
Conduct security audits to identify and address authorization issues.

Patching and Updates

Apply patches promptly to ensure systems are protected against known vulnerabilities.