CVE-2019-0190 : What You Need to Know

A vulnerability in Apache HTTP Server version 2.4.37 allows a remote attacker to trigger a denial of service through mod_ssl client renegotiations.

Understanding CVE-2019-0190

This CVE involves a flaw in mod_ssl's handling of client renegotiations, leading to a denial of service attack.

What is CVE-2019-0190?

The vulnerability in Apache HTTP Server 2.4.37 allows a malicious actor to exploit mod_ssl's behavior during client renegotiations, causing a denial of service.

The Impact of CVE-2019-0190

An external attacker can craft a request to trigger mod_ssl into a loop, resulting in a denial of service attack.
This vulnerability affects Apache HTTP Server version 2.4.37 when using OpenSSL version 1.1.1 or newer.

Technical Details of CVE-2019-0190

This section provides detailed technical information about the CVE.

Vulnerability Description

The bug in mod_ssl can be exploited by a remote attacker through a carefully crafted request.
The issue arises due to changes in how renegotiation attempts are handled in Apache HTTP Server 2.4.37.

Affected Systems and Versions

Product: Apache HTTP Server
Vendor: Apache Software Foundation
Versions Affected: Apache HTTP Server 2.4.37

Exploitation Mechanism

An external attacker can send a specifically crafted request to trigger mod_ssl into a loop, leading to a denial of service.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE.

Immediate Steps to Take

Update Apache HTTP Server to a non-vulnerable version.
Implement network-level protections to filter out potentially malicious requests.

Long-Term Security Practices

Regularly monitor and update software components to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.

Patching and Updates

Apply patches provided by Apache Software Foundation to fix the vulnerability.