CVE-2020-11985 : What You Need to Know

CVE-2020-11985 involves IP address spoofing in Apache HTTP Server versions 2.4.1 to 2.4.23 when using mod_remoteip and mod_rewrite. Learn about the impact, technical details, and mitigation steps.

Understanding CVE-2020-11985

This CVE addresses IP address spoofing vulnerabilities in Apache HTTP Server versions 2.4.1 to 2.4.23.

What is CVE-2020-11985?

CVE-2020-11985 pertains to IP address spoofing that occurs when proxying with mod_remoteip and specific mod_rewrite rules in Apache HTTP Server.

The Impact of CVE-2020-11985

The vulnerability allows attackers to spoof their IP addresses for logging and PHP scripts, potentially leading to unauthorized access and malicious activities.

Technical Details of CVE-2020-11985

Understanding the specifics of the vulnerability is crucial for effective mitigation.

Vulnerability Description

The issue arises in configurations using proxying with mod_remoteip and certain mod_rewrite rules, enabling attackers to manipulate their IP addresses.

Affected Systems and Versions

Product: Apache HTTP Server
Versions Affected: 2.4.1 to 2.4.23

Exploitation Mechanism

Attackers exploit the vulnerability by manipulating mod_remoteip and mod_rewrite configurations to falsify their IP addresses.

Mitigation and Prevention

Taking immediate and long-term security measures is essential to safeguard systems.

Immediate Steps to Take

Update Apache HTTP Server to version 2.4.24 or later to address the vulnerability.
Review and adjust mod_remoteip and mod_rewrite configurations to enhance IP address verification.

Long-Term Security Practices

Regularly monitor and audit server logs for unusual IP address activities.
Implement network-level security measures to detect and prevent IP spoofing attacks.

Patching and Updates

Stay informed about security advisories and promptly apply patches released by Apache HTTP Server.