CVE-2021-45933 : Security Advisory and Response
Learn about CVE-2021-45933 affecting wolfSSL wolfMQTT 1.9 with a heap-based buffer overflow of 8 bytes in MqttDecode_Publish. Find mitigation steps and affected systems.
wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttDecode_Publish.
Understanding CVE-2021-45933
What is CVE-2021-45933?
wolfSSL wolfMQTT 1.9 is affected by a heap-based buffer overflow of 8 bytes in the MqttDecode_Publish function.
The Impact of CVE-2021-45933
This vulnerability can be exploited to execute arbitrary code by sending a crafted MQTT packet to the target system.
Technical Details of CVE-2021-45933
Vulnerability Description
The heap-based buffer overflow of 8 bytes occurs in MqttDecode_Publish, which is called from MqttClient_DecodePacket and MqttClient_HandlePacket.
Affected Systems and Versions
- Product: wolfSSL
- Vendor: N/A
- Version: 1.9
Exploitation Mechanism
The vulnerability can be exploited by an attacker sending a specifically crafted MQTT packet to the affected system.
Mitigation and Prevention
Immediate Steps to Take
- Apply the vendor's patch or update to a non-vulnerable version.
- Monitor network traffic for signs of exploitation.
Long-Term Security Practices
- Regularly update software to the latest versions.
- Implement network segmentation to limit the impact of potential attacks.
- Conduct security assessments and penetration testing regularly.
Patching and Updates
Ensure that all systems are updated with the latest patches provided by the vendor.