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CVE-2017-2893 : Security Advisory and Response

Learn about CVE-2017-2893 affecting Cesanta Mongoose 6.8. Discover the impact, technical details, affected systems, exploitation method, and mitigation steps to secure your systems.

Cesanta Mongoose 6.8 contains a vulnerability in its MQTT packet parsing feature, leading to a server crash and denial of service due to a NULL pointer dereference when handling an MQTT SUBSCRIBE packet.

Understanding CVE-2017-2893

This CVE involves a vulnerability in Cesanta Mongoose 6.8 that can be exploited to cause a denial of service attack.

What is CVE-2017-2893?

        The vulnerability is in the MQTT packet parsing feature of Cesanta Mongoose 6.8.
        It allows an attacker to crash the server by sending a carefully crafted MQTT packet.

The Impact of CVE-2017-2893

        CVSS Score: 7.5 (High)
        Attack Vector: Network
        Availability Impact: High
        Attack Complexity: Low
        This vulnerability can lead to a server crash and denial of service.

Technical Details of CVE-2017-2893

Cesanta Mongoose 6.8 vulnerability details.

Vulnerability Description

        An exploitable NULL pointer dereference vulnerability exists in the MQTT packet parsing functionality.
        Triggered by handling an MQTT SUBSCRIBE packet, causing a server crash.

Affected Systems and Versions

        Affected Product: Mongoose
        Vendor: Cesanta
        Affected Version: 6.8

Exploitation Mechanism

        Attacker must send a carefully constructed MQTT packet via the network to exploit the vulnerability.

Mitigation and Prevention

Protecting systems from CVE-2017-2893.

Immediate Steps to Take

        Apply vendor-supplied patches or updates promptly.
        Implement network-level controls to filter out malicious MQTT packets.

Long-Term Security Practices

        Regularly update and patch software to address known vulnerabilities.
        Conduct security assessments and penetration testing to identify and mitigate weaknesses.

Patching and Updates

        Stay informed about security advisories from vendors.
        Monitor CVE databases for any new information or patches.

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