CVE-2023-30536 Explained : Impact and Mitigation

A header validation vulnerability in slim/psr7 prior to version 1.6.1 allows attackers to insert newlines into header names and values, potentially leading to application errors and denial of service attacks.

Understanding CVE-2023-30536

Insecure header validation in slim/psr7

What is CVE-2023-30536?

slim/psr7 is a PSR-7 implementation used with Slim 4. Prior to version 1.6.1, attackers could manipulate headers, causing invalid messages and potential denial of service through malformed requests.

The Impact of CVE-2023-30536

This vulnerability could result in application errors or denial of service attacks if a remote service's web application firewall blocks the application due to receiving malformed requests.

Technical Details of CVE-2023-30536

Vulnerability Description

Attackers can sneak in a newline character into header names and values, allowing them to craft invalid messages and potentially disrupt target systems.

Affected Systems and Versions

Vendor: slimphp
Product: Slim-Psr7
Affected Versions: < 1.6.1

Exploitation Mechanism

By manipulating header names and values, attackers can send out invalid HTTP requests using an PSR-18 HTTP client, potentially causing application errors or denial of service.

Mitigation and Prevention

Immediate Steps to Take

Upgrade to version 1.6.1 to patch the vulnerability as there are no known workarounds for this issue.

Long-Term Security Practices

Regularly update software and libraries to ensure security patches are applied promptly to mitigate potential risks.

Patching and Updates

Stay informed about security advisories and promptly apply patches provided by software vendors to maintain a secure environment.