Rejetto HTTP File Server, up to and including version 2.3m, is vulnerable to a template injection vulnerability. This vulnerability allows a remote, unauthenticated attacker to execute arbitrary commands on the affected system by sending a specially crafted HTTP request. As of the CVE assignment date, Rejetto HFS 2.3m is no longer supported.

This flaw enables attackers to execute arbitrary code on the server, posing significant security risks. In this post, we examine Rejetto HFS, the affected versions, the impact of the vulnerability, and the timeline of its discovery and remediation.

Introduction to CVE-2024-23692

The Rejetto HTTP File Server (HFS) has recently been found to have a critical security vulnerability designated as CVE-2024-23692. This unauthenticated remote code execution (RCE) flaw poses significant risks to systems running the affected versions of HFS. Understanding the nature and implications of this vulnerability is crucial for administrators and security professionals.

What is Unauthenticated RCE?

Remote Code Execution (RCE) vulnerabilities allow attackers to execute arbitrary code on a remote system. When such flaws are unauthenticated, it means that the attacker does not need to be a legitimate user or have valid credentials to exploit the vulnerability. This greatly increases the potential for widespread damage.

Details of the Vulnerability

CVE-2024-23692 affects specific versions of the Rejetto HTTP File Server. The flaw arises from improper input validation, which allows an attacker to craft malicious HTTP requests. These requests can execute arbitrary code on the server, providing the attacker with control over the affected system. The HFS software’s design flaw lies in how it handles certain HTTP requests, leading to this critical vulnerability.

Mitigation and Recommendations

Addressing CVE-2024-23692 requires immediate attention. Users of Rejetto HTTP File Server should update to the latest patched version as soon as it becomes available. In the interim, implementing network-level security measures, such as firewalls and intrusion detection systems, can help mitigate the risk of exploitation. Regularly monitoring system logs for suspicious activity can also aid in early detection of potential attacks.

Ensuring that all systems are up-to-date with the latest security patches is a fundamental step in protecting against such vulnerabilities. By staying informed about potential threats and taking proactive measures, administrators can safeguard their systems from unauthenticated RCE flaws like CVE-2024-23692.