CVE-2019-18277 : Vulnerability Insights and Analysis

HAProxy versions prior to 2.0.6 had a vulnerability that could lead to an HTTP request smuggling attack.

Understanding CVE-2019-18277

HAProxy before version 2.0.6 was susceptible to a specific vulnerability that could potentially be exploited for an HTTP request smuggling attack.

What is CVE-2019-18277?

A flaw in HAProxy versions before 2.0.6 allowed messages lacking the correct value for the transfer-encoding header to not be properly rejected. This flaw, when combined with certain settings, could lead to an HTTP request smuggling attack.

The Impact of CVE-2019-18277

The vulnerability in HAProxy could be exploited to carry out an HTTP request smuggling attack against a susceptible component, potentially bypassing security measures.

Technical Details of CVE-2019-18277

HAProxy before version 2.0.6 had a specific vulnerability that could be exploited for an HTTP request smuggling attack.

Vulnerability Description

In legacy mode, messages lacking the correct value for the transfer-encoding header were not properly rejected, potentially allowing for an HTTP request smuggling attack.

Affected Systems and Versions

Product: HAProxy
Vendor: N/A
Versions affected: Versions prior to 2.0.6

Exploitation Mechanism

The vulnerability could be exploited when combined with the "http-reuse always" setting to carry out an HTTP request smuggling attack.

Mitigation and Prevention

Steps to address and prevent the CVE-2019-18277 vulnerability.

Immediate Steps to Take

Update HAProxy to version 2.0.6 or later to mitigate the vulnerability.
Monitor vendor advisories for any patches or security updates.

Long-Term Security Practices

Regularly update and patch software to prevent vulnerabilities.
Implement secure coding practices to reduce the risk of exploitation.

Patching and Updates

Apply patches and updates provided by HAProxy to address the vulnerability.