CVE-2019-20372 : Vulnerability Insights and Analysis

NGINX before version 1.17.7 is vulnerable to HTTP request smuggling due to specific error_page configurations. This allows unauthorized access to web pages when NGINX is used with a load balancer.

Understanding CVE-2019-20372

This CVE involves a security vulnerability in NGINX that can lead to unauthorized access to web pages.

What is CVE-2019-20372?

NGINX versions prior to 1.17.7 are susceptible to HTTP request smuggling when certain error_page configurations are present. This issue enables attackers to gain unauthorized access to web pages when NGINX is utilized alongside a load balancer.

The Impact of CVE-2019-20372

The vulnerability in NGINX can result in unauthorized access to web pages, compromising the security and integrity of the affected systems.

Technical Details of CVE-2019-20372

This section provides detailed technical information about the CVE-2019-20372 vulnerability.

Vulnerability Description

NGINX before version 1.17.7, with specific error_page configurations, allows HTTP request smuggling. Attackers can exploit this to read unauthorized web pages when NGINX is fronted by a load balancer.

Affected Systems and Versions

NGINX versions before 1.17.7

Exploitation Mechanism

The vulnerability occurs due to certain error_page configurations in NGINX, enabling attackers to perform HTTP request smuggling.

Mitigation and Prevention

Protecting systems from CVE-2019-20372 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update NGINX to version 1.17.7 or newer to mitigate the vulnerability.
Review and adjust error_page configurations to prevent HTTP request smuggling.

Long-Term Security Practices

Regularly monitor NGINX security advisories and update the software promptly.
Implement secure configurations and practices to enhance web server security.

Patching and Updates

Apply patches and updates provided by NGINX to address security vulnerabilities promptly.