Horizon Alert
Summary of the vulnerability and why it matters
An issue in Froxlor server administration software allows an authenticated user to execute arbitrary PHP code on the server. This happens because the software does not properly validate a parameter used for language loading, enabling a path traversal attack. This could lead to a complete compromise of the affected server.
- Internet-accessible management tools are targets.
- Unauthorized code execution on servers.
- Sensitive data and system control are at risk.
Attack Path
How an attacker could exploit the issue
An authenticated customer using an older version of Froxlor can abuse a flaw in the API to execute arbitrary PHP code. They would achieve this by sending a specially crafted request to update their profile, manipulating a language setting to point to a malicious file path. This allows them to run any code they want on the web server.
- Authenticated customer access needed.
- API endpoint is the vulnerable surface.
- Path traversal payload exploits unchecked input.
Live Threat
Current exploitation, exposure, and threat context
Attackers may find this vulnerability appealing due to its potential for arbitrary code execution within the web server's context, which is a high-impact outcome. The path traversal leading to `require` of a malicious file bypasses typical code execution restrictions. However, it requires prior authentication, limiting its utility to situations where an attacker can gain initial access to a customer or admin account.
- Requires authenticated access.
- Path traversal leads to RCE.
- Exploits a common configuration management tool.
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
Prioritize patching or upgrading Froxlor to version 2.3.6 immediately, as this vulnerability allows authenticated users to achieve arbitrary PHP code execution. If immediate patching is not feasible, consider implementing stricter input validation on the `def_language` parameter to prevent path traversal, and enhance monitoring for suspicious file access patterns in the web server logs.
- Upgrade Froxlor to 2.3.6.
- Monitor for anomalous file access.
- Validate `def_language` parameter.
