CVE-2021-20235 : What You Need to Know

A vulnerability has been identified in the zeromq server before version 4.3.3 that could allow a remote attacker to trigger a buffer overflow WRITE if certain conditions are met.

Understanding CVE-2021-20235

This section provides insight into the nature of the vulnerability and its possible impacts.

What is CVE-2021-20235?

The flaw exists in the zeromq server before version 4.3.3, specifically in src/decoder_allocators.hpp. It allows an unauthenticated attacker to exploit a buffer overflow WRITE vulnerability under specific circumstances involving CURVE/ZAP authentication.

The Impact of CVE-2021-20235

The primary consequences of this vulnerability include compromising application availability, data integrity, and confidentiality.

Technical Details of CVE-2021-20235

Explore the specific technical aspects of the CVE in this section.

Vulnerability Description

The flaw in the static allocator of the decoder in zeromq server can result in a buffer overflow WRITE of arbitrary data if CURVE/ZAP authentication is disabled.

Affected Systems and Versions

The vulnerability impacts zeromq server versions before 4.3.3.

Exploitation Mechanism

A remote, unauthenticated attacker can exploit this vulnerability by sending a crafted request to the zeromq server under specific conditions.

Mitigation and Prevention

Discover the necessary steps to mitigate the risks associated with CVE-2021-20235.

Immediate Steps to Take

Enabling CURVE/ZAP authentication is crucial to preventing exploitation of this vulnerability. Ensure that the zeromq server is updated to version 4.3.3 or above.

Long-Term Security Practices

Establish robust security protocols and practices within your network infrastructure to enhance overall protection against similar threats.

Patching and Updates

Regularly monitor for security patches and updates for the zeromq server to address vulnerabilities and enhance security measures.