CVE-2021-45936 Explained : Impact and Mitigation
Learn about CVE-2021-45936 affecting wolfSSL wolfMQTT 1.9 with a heap-based buffer overflow, its impacts, and mitigation steps. Stay secure with updates and prevention measures.
wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow vulnerability in MqttDecode_Disconnect with potential system impact.
Understanding CVE-2021-45936
What is CVE-2021-45936?
wolfSSL wolfMQTT 1.9 is susceptible to a heap-based buffer overflow in MqttDecode_Disconnect, triggered from MqttClient_DecodePacket and MqttClient_WaitType.
The Impact of CVE-2021-45936
The vulnerability can allow attackers to execute arbitrary code or crash the application, potentially compromising system integrity.
Technical Details of CVE-2021-45936
Vulnerability Description
A heap-based buffer overflow vulnerability exists in MqttDecode_Disconnect function of wolfSSL wolfMQTT 1.9.
Affected Systems and Versions
- Product: Not applicable
- Vendor: Not applicable
- Versions affected: 1.9
Exploitation Mechanism
The vulnerability can be exploited by crafting malicious messages that trigger the buffer overflow during the disconnection process.
Mitigation and Prevention
Immediate Steps to Take
- Update wolfMQTT to a non-vulnerable version.
- Implement input validation checks to prevent buffer overflows.
Long-Term Security Practices
- Regularly monitor and apply security patches for libraries and dependencies.
Patching and Updates
Apply patches provided by the wolfSSL project to address the vulnerability.