CVE-2021-33833 : Security Advisory and Response

A stack-based buffer overflow vulnerability was discovered in ConnMan (aka Connection Manager) versions 1.30 through 1.39 in the dnsproxy component.

Understanding CVE-2021-33833

This section will cover the details of the CVE-2021-33833 vulnerability, its impact, technical description, affected systems, exploitation mechanism, and mitigation steps.

What is CVE-2021-33833?

The CVE-2021-33833 vulnerability exists in ConnMan's dnsproxy.c due to a stack-based buffer overflow via NAME, RDATA, or RDLENGTH for A or AAAA.

The Impact of CVE-2021-33833

This vulnerability could allow an attacker to execute arbitrary code or crash the affected service, leading to a denial of service condition.

Technical Details of CVE-2021-33833

Let's dive into the technical specifics of the CVE-2021-33833 vulnerability to better understand its nature.

Vulnerability Description

ConnMan versions 1.30 through 1.39 are susceptible to a stack-based buffer overflow in the dnsproxy component, triggered by specific input parameters.

Affected Systems and Versions

All systems running ConnMan versions 1.30 through 1.39 are impacted by this vulnerability.

Exploitation Mechanism

An attacker can exploit this vulnerability by sending malicious packets containing crafted data to the targeted service, potentially leading to remote code execution.

Mitigation and Prevention

Learn about the steps you can take to mitigate the risks associated with CVE-2021-33833.

Immediate Steps to Take

It is crucial to apply security patches provided by the vendor to address this vulnerability promptly.

Long-Term Security Practices

Implement network segmentation, least privilege access controls, and regular security audits to enhance overall system security.

Patching and Updates

Keep systems up to date with the latest security patches and version updates to prevent exploitation of known vulnerabilities.