CVE-2019-6250 : What You Need to Know

A vulnerability was found in the ZeroMQ libzmq (also known as 0MQ) version 4.2.x and 4.3.x prior to 4.3.1, involving a pointer overflow that enables code execution. This exploit allows an attacker to execute arbitrary code on the targeted system.

Understanding CVE-2019-6250

What is CVE-2019-6250?

This CVE involves a pointer overflow in ZeroMQ libzmq versions 4.2.x and 4.3.x before 4.3.1, allowing an attacker to execute arbitrary code.

The Impact of CVE-2019-6250

The vulnerability permits an attacker with proper authentication to overwrite a significant amount of bytes beyond the buffer's boundaries, leading to code execution on the system.

Technical Details of CVE-2019-6250

Vulnerability Description

An integer overflow in the zmq::v2_decoder_t::size_ready function in the v2_decoder.cpp file allows an attacker to overwrite bytes beyond the buffer's boundaries, enabling arbitrary code execution.

Affected Systems and Versions

ZeroMQ libzmq versions 4.2.x and 4.3.x before 4.3.1

Exploitation Mechanism

The attacker can inject operating system commands into a data structure immediately following the affected buffer, without traditional buffer-overflow techniques.

Mitigation and Prevention

Immediate Steps to Take

Update ZeroMQ libzmq to version 4.3.1 or later.
Implement proper authentication mechanisms.

Long-Term Security Practices

Regularly monitor and update software components.
Conduct security assessments to identify and mitigate vulnerabilities.

Patching and Updates

Apply patches and updates promptly to address known security issues.