CVE-2018-18765 : What You Need to Know

Cesanta Mongoose 6.13 contains a vulnerability in its MQTT packet-parsing functionality that can lead to arbitrary memory read. This heap-based buffer over-read in mg_mqtt_next_subscribe_topic can be exploited by sending a crafted MQTT SUBSCRIBE packet over the network, potentially resulting in sensitive information disclosure and denial of service.

Understanding CVE-2018-18765

Cesanta Mongoose 6.13 MQTT Packet-Parsing Vulnerability

What is CVE-2018-18765?

An arbitrary memory read vulnerability in Cesanta Mongoose 6.13's MQTT packet-parsing functionality, specifically in mg_mqtt_next_subscribe_topic. By sending a malicious MQTT SUBSCRIBE packet, an attacker can trigger this vulnerability.

The Impact of CVE-2018-18765

Exploiting this vulnerability can lead to the disclosure of sensitive information and cause denial of service.

Technical Details of CVE-2018-18765

Details of the vulnerability in Cesanta Mongoose 6.13

Vulnerability Description

Type: Arbitrary memory read
Location: MQTT packet-parsing functionality
Trigger: Crafted MQTT SUBSCRIBE packet

Affected Systems and Versions

Product: Cesanta Mongoose 6.13
Vendor: Cesanta
Version: 6.13

Exploitation Mechanism

Exploited by sending a carefully crafted MQTT SUBSCRIBE packet over the network

Mitigation and Prevention

Protecting against CVE-2018-18765

Immediate Steps to Take

Apply vendor patches or updates promptly
Monitor network traffic for any suspicious MQTT packets
Implement network segmentation to limit the impact of potential attacks

Long-Term Security Practices

Regularly update and patch all software components
Conduct security assessments and penetration testing to identify vulnerabilities
Educate users and administrators on secure MQTT packet handling

Patching and Updates

Check vendor advisories for patches and updates
Apply recommended security configurations to MQTT implementations