CVE-2019-14243 : Security Advisory and Response

In the mastercactapus proxyprotocol version prior to 0.0.2, a vulnerability exists that can lead to a denial of service attack when exploited by malicious actors.

Understanding CVE-2019-14243

What is CVE-2019-14243?

This CVE refers to a vulnerability in the mastercactapus proxyprotocol version before 0.0.2, specifically affecting the mastercactapus caddy-proxyprotocol plugin up to version 0.0.2 for Caddy. The issue allows attackers to trigger a denial of service by sending a specially crafted HAProxy PROXY v2 request with truncated source and destination address data, causing a panic and crash of the webserver and daemon.

The Impact of CVE-2019-14243

The exploitation of this vulnerability can result in a denial of service, disrupting the availability of the affected webserver and daemon.

Technical Details of CVE-2019-14243

Vulnerability Description

The vulnerability in headerv2.go in mastercactapus proxyprotocol before 0.0.2 allows remote attackers to cause a denial of service by sending a crafted HAProxy PROXY v2 request with truncated source/destination address data.

Affected Systems and Versions

Product: n/a
Vendor: n/a
Versions: Up to version 0.0.2

Exploitation Mechanism

Attackers exploit the vulnerability by sending a specially crafted HAProxy PROXY v2 request with truncated source and destination address data.

Mitigation and Prevention

Immediate Steps to Take

Update to version 0.0.2 or later of the mastercactapus proxyprotocol to mitigate the vulnerability.
Monitor network traffic for any suspicious activity that could indicate an ongoing attack.

Long-Term Security Practices

Regularly update software and plugins to the latest versions to patch known vulnerabilities.
Implement network security measures to detect and prevent denial of service attacks.

Patching and Updates

Ensure timely installation of security patches and updates provided by the software vendor to address known vulnerabilities.