CVE-2023-38690 : What You Need to Know

This article provides detailed information about CVE-2023-38690, a vulnerability in the matrix-appservice-irc IRC bridge for Matrix that allows command injection via admin commands containing newlines.

Understanding CVE-2023-38690

matrix-appservice-irc is a Node.js IRC bridge for Matrix. Prior to version 1.0.1, a vulnerability existed where commands with newlines could be crafted and executed by the IRC bridge bot, leading to command injection.

What is CVE-2023-38690?

The CVE-2023-38690 vulnerability in matrix-appservice-irc allowed malicious users to pass a string of commands as a channel name, enabling them to execute arbitrary commands through the IRC bridge.

The Impact of CVE-2023-38690

This vulnerability could be exploited by attackers to execute unauthorized commands on the affected system, potentially leading to data leaks, service disruption, or unauthorized access.

Technical Details of CVE-2023-38690

The vulnerability was classified with a CVSS v3.1 base score of 5.8, indicating a medium severity issue. It had a low attack complexity and vector over the network.

Vulnerability Description

The vulnerability stemmed from improper input validation and improper neutralization of special elements used in a command, allowing for command injection via newlines.

Affected Systems and Versions

The vulnerability affected versions of matrix-appservice-irc prior to 1.0.1. Versions 1.0.1 and above are not susceptible to this vulnerability.

Exploitation Mechanism

Attackers could exploit this vulnerability by creating specially crafted commands containing newlines, which would be executed by the IRC bridge bot, leading to command injection.

Mitigation and Prevention

Immediate action is required to mitigate the risks associated with CVE-2023-38690.

Immediate Steps to Take

Users are advised to update matrix-appservice-irc to version 1.0.1 or above to patch the vulnerability and prevent further exploitation.

Long-Term Security Practices

To enhance security, disabling dynamic channels in the configuration can mitigate the most common exploitation method. Additionally, monitoring for suspicious activities and applying security best practices is crucial.

Patching and Updates

Vendor matrix-org has released version 1.0.1 to address the vulnerability. It is essential to regularly update software to the latest versions and apply security patches promptly.