CVE-2025-2071
Remediation / Mitigation Strategy for CVE-2025-2071
Vulnerability Description
A critical OS Command Injection vulnerability exists in the FAST LTA Silent Brick WebUI. The vulnerability allows remote attackers to execute arbitrary operating system commands through the “hd” and “pi” parameters. This is due to insufficient sanitization and validation of user-supplied input before it’s passed to system-level commands.
Severity
Critical (CVSSv3 Score: 10.0) This vulnerability allows for unauthenticated remote code execution, potentially leading to complete system compromise.
Known Exploit
Attackers can craft malicious requests to the Silent Brick WebUI containing specially crafted input within the “hd” and “pi” parameters. This input is then passed directly to the underlying operating system, allowing the attacker to execute arbitrary commands with the privileges of the web server process.
Remediation Strategy
Input Sanitization and Validation: Implement robust input sanitization and validation for all user-supplied input, specifically targeting the “hd” and “pi” parameters in the Silent Brick WebUI. This should include:
- Whitelisting: Define a strict whitelist of allowed characters, data types, and values for each parameter. Reject any input that doesn’t conform to the whitelist.
- Encoding: Properly encode all input before using it in system commands. Utilize appropriate escaping mechanisms to prevent command injection (e.g.,
escapeshellarg()in PHP or similar functions in other languages). - Length Limits: Impose reasonable length limits on input fields to prevent buffer overflows or other memory-related issues.
Principle of Least Privilege: Ensure that the web server process runs with the minimum necessary privileges to perform its functions. Avoid running the web server process as a privileged user (e.g., root).
Command Execution Abstraction: Instead of directly executing system commands with user-supplied input, abstract the command execution process using a safe API or library that limits the available commands and parameters. This provides an additional layer of security.
Patching/Updating: Check for and apply any official patches or updates released by FAST LTA that address this vulnerability. This is the most effective long-term solution.
Web Application Firewall (WAF): Deploy a Web Application Firewall (WAF) to detect and block malicious requests attempting to exploit this vulnerability. Configure the WAF with rules to identify and block command injection attempts, particularly those targeting the “hd” and “pi” parameters.
Disable Affected Functionality (Temporary): As an immediate mitigation, temporarily disable the affected functionality within the WebUI (e.g., disable access to features utilizing the “hd” and “pi” parameters) until a permanent fix can be implemented.
Mitigation Strategy
Network Segmentation: Isolate the Silent Brick system on a separate network segment with restricted access to other systems. This limits the potential damage from a successful exploit.
Intrusion Detection System (IDS): Deploy an Intrusion Detection System (IDS) to monitor network traffic for suspicious activity related to command injection attempts. Configure the IDS to alert administrators to any potential attacks.
Regular Security Audits: Conduct regular security audits and penetration testing to identify and address other potential vulnerabilities in the Silent Brick system and its associated infrastructure.
Logging and Monitoring: Enable comprehensive logging of all web server activity and system commands. Monitor logs for any suspicious activity or unauthorized command execution.
User Education: Educate users about the risks of command injection attacks and the importance of using strong passwords and avoiding suspicious links.
Assigner
- SEC Consult Vulnerability Lab
Date
- Published Date: 2025-03-31 08:33:53
- Updated Date: 2025-03-31 09:15:15