CVE-2021-43518 : Security Advisory and Response

Teeworlds up to and including version 0.7.5 is vulnerable to a Buffer Overflow. A map parser in Teeworlds fails to validate the m_Channels value from a map file, leading to a buffer overflow. This vulnerability could allow a malicious server to provide a specially crafted map that overwrites the client's stack, resulting in denial of service or potential code execution.

Understanding CVE-2021-43518

Teeworlds vulnerability with potential code execution.

What is CVE-2021-43518?

Teeworlds up to version 0.7.5 is susceptible to a Buffer Overflow due to inadequate validation in the map parser, enabling a specially crafted map to compromise client systems.

The Impact of CVE-2021-43518

The vulnerability can allow a malicious server to execute code or cause denial of service by exploiting a buffer overflow in Teeworlds.

Technical Details of CVE-2021-43518

Details of the vulnerability in Teeworlds.

Vulnerability Description

Teeworlds 0.7.5 and below suffer from a buffer overflow caused by insufficient validation of map file input, potentially leading to code execution.

Affected Systems and Versions

Product: Teeworlds
Version: up to and including 0.7.5

Exploitation Mechanism

The exploit involves offering a carefully crafted map that alters the client's stack, thereby triggering the buffer overflow.

Mitigation and Prevention

Steps to mitigate the CVE-2021-43518 vulnerability.

Immediate Steps to Take

Update Teeworlds to version 0.7.6 or later to patch the vulnerability.
Avoid connecting to untrusted servers or downloading maps from unknown sources.

Long-Term Security Practices

Regularly update software and enable automatic updates to stay protected against known vulnerabilities.
Monitor security advisories and apply patches promptly to mitigate emerging threats.

Patching and Updates

Apply official patches from Teeworlds to address the buffer overflow vulnerability in affected versions.