CVE-2019-20917 : Vulnerability Insights and Analysis

A vulnerability was found in InspIRCd versions 2 up to 2.0.28 and versions 3 up to 3.3.0. The mysql module exhibits a NULL pointer dereference when compiled with mariadb-connector-c 3.0.5 or later. This vulnerability, when utilized with the sqlauth or sqloper modules, can result in the remote crashing of an InspIRCd server by any user with the capability to connect to said server.

Understanding CVE-2019-20917

This CVE identifies a vulnerability in InspIRCd that can lead to a remote server crash.

What is CVE-2019-20917?

CVE-2019-20917 is a vulnerability in InspIRCd versions 2 up to 2.0.28 and versions 3 up to 3.3.0, specifically related to the mysql module when compiled with mariadb-connector-c 3.0.5 or later. Exploiting this vulnerability with certain modules can allow any user with server connection capabilities to crash the server remotely.

The Impact of CVE-2019-20917

This vulnerability can be exploited by malicious users to remotely crash an InspIRCd server, potentially leading to service disruption and denial of service.

Technical Details of CVE-2019-20917

This section provides technical details about the vulnerability.

Vulnerability Description

The mysql module in InspIRCd versions 2 up to 2.0.28 and versions 3 up to 3.3.0 exhibits a NULL pointer dereference when compiled with mariadb-connector-c 3.0.5 or later. When combined with the sqlauth or sqloper modules, this vulnerability can be used to crash the server remotely.

Affected Systems and Versions

InspIRCd versions 2 up to 2.0.28
InspIRCd versions 3 up to 3.3.0

Exploitation Mechanism

The vulnerability arises when the mysql module is built against mariadb-connector-c 3.0.5 or newer. By leveraging the sqlauth or sqloper modules, attackers can exploit this issue to crash an InspIRCd server remotely.

Mitigation and Prevention

Protect your systems from CVE-2019-20917 with the following steps:

Immediate Steps to Take

Update InspIRCd to a patched version that addresses the vulnerability.
Monitor server logs for any unusual activity that may indicate exploitation.

Long-Term Security Practices

Regularly update and patch all software components to prevent known vulnerabilities.
Implement network security measures to restrict unauthorized access to servers.

Patching and Updates

Ensure timely application of security patches and updates to mitigate the risk of exploitation.