CVE-2021-45932 : Vulnerability Insights and Analysis

wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow vulnerability that can lead to a security issue.

Understanding CVE-2021-45932

wolfMQTT has a vulnerability that allows a heap-based buffer overflow.

What is CVE-2021-45932?

The vulnerability in wolfMQTT 1.9 leads to a heap-based buffer overflow in MqttDecode_Publish, called from MqttClient_DecodePacket and MqttClient_HandlePacket.

The Impact of CVE-2021-45932

The vulnerability can potentially be exploited by attackers to execute arbitrary code or disrupt the application's functionality.

Technical Details of CVE-2021-45932

This section covers the technical aspects of the vulnerability.

Vulnerability Description

A heap-based buffer overflow (4 bytes) exists in MqttDecode_Publish within wolfMQTT 1.9.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Version: Not applicable

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting specific MQTT messages to trigger the buffer overflow and potentially execute malicious code.

Mitigation and Prevention

Here are steps to mitigate and prevent exploitation of this vulnerability.

Immediate Steps to Take

Update to the latest version of wolfSSL wolfMQTT that contains a patch for this vulnerability.
Monitor network traffic for any signs of exploit attempts.
Implement network segmentation to restrict access to potentially vulnerable systems.

Long-Term Security Practices

Regularly update software and firmware to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.
Educate users on safe practices to minimize the risk of successful attacks.

Patching and Updates

Ensure timely application of patches provided by wolfSSL to fix the heap-based buffer overflow vulnerability.