CVE-2021-29462 : Vulnerability Insights and Analysis

This article provides details about CVE-2021-29462, a vulnerability related to DNS rebinding in pupnp.

Understanding CVE-2021-29462

CVE-2021-29462 is a security vulnerability found in the Portable SDK for UPnP Devices, specifically affecting pupnp.

What is CVE-2021-29462?

The vulnerability arises from the server part of pupnp (libupnp) being susceptible to DNS rebinding attacks due to inadequate validation of the

Host

header.

The Impact of CVE-2021-29462

The impact of this vulnerability is rated as HIGH, with the potential for unauthorized access to confidential information, compromised data integrity, and low availability of services.

Technical Details of CVE-2021-29462

This section delves into the specific technical aspects of the CVE-2021-29462 vulnerability.

Vulnerability Description

The DNS rebinding vulnerability in pupnp results from the lack of validation of the

Host

header, opening avenues for malicious actors to exploit the server.

Affected Systems and Versions

The vulnerability affects versions of pupnp earlier than 1.14.6, leaving these systems exposed to DNS rebinding attacks.

Exploitation Mechanism

Exploiting this vulnerability involves manipulating the

Host

header to launch DNS rebinding attacks on systems running vulnerable versions of pupnp.

Mitigation and Prevention

To address and mitigate the risks associated with CVE-2021-29462, organizations and users should take the following actions.

Immediate Steps to Take

Users should update to version 1.14.6 or later of pupnp to remediate the vulnerability and protect systems from DNS rebinding attacks.

Long-Term Security Practices

Implement proper input validation mechanisms and educate developers on secure coding practices to prevent similar vulnerabilities in the future.

Patching and Updates

Regularly apply security patches and updates provided by pupnp to ensure systems are protected against known vulnerabilities.