Overview
CVE-2024-58275 details a critical vulnerability affecting Easywall version 0.3.1, a simplified firewall management interface. This vulnerability allows authenticated remote attackers to execute arbitrary commands on the server due to a command injection flaw in the /ports-save endpoint. By injecting shell metacharacters into specific parameters, attackers can bypass intended input validation and execute malicious code.
Technical Details
The vulnerability resides within the /ports-save endpoint of Easywall 0.3.1. This endpoint is responsible for saving port configurations. The application fails to properly sanitize user-supplied input, leading to a parameter injection flaw. An authenticated attacker can exploit this flaw by injecting shell metacharacters (e.g., ;, |, &) into the parameters sent to the /ports-save endpoint. The application then executes these commands with the privileges of the web server process, leading to remote command execution.
Essentially, the untrusted input is incorporated directly into a system call without proper escaping or sanitization. This allows an attacker to break out of the intended command and inject their own malicious commands.
CVSS Analysis
Currently, the CVSS score and severity for CVE-2024-58275 are listed as N/A. This often happens when a CVE is newly published or when the severity assessment is still in progress. However, given the nature of the vulnerability – remote command execution – it is highly likely that the CVSS score will be high (Critical or High severity) once assessed. A successful exploit grants a malicious actor full control over the affected system.
Possible Impact
The impact of CVE-2024-58275 is severe. A successful exploit could allow an attacker to:
- Gain complete control of the affected server.
- Install malware or backdoors.
- Steal sensitive data, including credentials and configuration files.
- Disrupt service by crashing the server or launching denial-of-service attacks.
- Pivot to other systems on the network.
Mitigation or Patch Steps
Currently, there is no official patch released by the Easywall developers. However, you can implement the following mitigation strategies:
- Restrict Access: Limit network access to the Easywall interface. Only allow authorized users to access the web application.
- Input Validation: Implement robust input validation and sanitization measures. Specifically, escape or remove shell metacharacters from all user-supplied input before it’s used in system calls. This is the most critical mitigation step.
- Web Application Firewall (WAF): Deploy a Web Application Firewall (WAF) to detect and block malicious requests targeting the
/ports-saveendpoint. Configure the WAF to look for shell metacharacters in the request parameters. - Least Privilege: Ensure that the web server process running Easywall operates with the least necessary privileges. This can limit the impact of a successful exploit.
- Monitor System Activity: Regularly monitor system logs for suspicious activity, such as unexpected process executions or unauthorized file access.
- Stay Updated: Monitor the Easywall project (linked below) for any official patches or updates and apply them immediately when available.
Contact the Easywall developers and urge them to release a patch addressing this vulnerability.
