CVE-2021-41267 : Vulnerability Insights and Analysis

Symfony/Http-Kernel is the HTTP kernel component for Symfony, a PHP framework. A vulnerability in Symfony 5.2 allows attackers to exploit the

X-Forwarded-Prefix

header, potentially leading to web cache poisoning.

Understanding CVE-2021-41267

What is CVE-2021-41267?

Symfony 5.2 vulnerability allows a forged

X-Forwarded-Prefix

header, enabling attackers to conduct web cache poisoning.

The Impact of CVE-2021-41267

The vulnerability poses a medium severity risk with a CVSS base score of 6.5. Attackers could manipulate requests, leading to cache poisoning.

Technical Details of CVE-2021-41267

Vulnerability Description

Symfony 5.2 allows misuse of

X-Forwarded-Prefix

header
Attackers can forge requests, risking cache poisoning

Affected Systems and Versions

Product: Symfony
Vendor: Symfony
Versions: >= 5.2.0, < 5.3.12

Exploitation Mechanism

Attack Complexity: Low
Attack Vector: Network
Integrity Impact: High
User Interaction: Required

Mitigation and Prevention

Immediate Steps to Take

Update to Symfony version 5.3.12 or later
Verify and limit the usage of

X-Forwarded-Prefix

header

Long-Term Security Practices

Regular security audits and code reviews
Educate developers on secure coding practices
Implement strict HTTP header controls

Patching and Updates

Apply the patch from Symfony releases to address the vulnerability