CVE-2025-27718
Remediation/Mitigation Strategy for CVE-2025-27718
Vulnerability: Path Traversal in USB storage file-sharing function of HGW-BL1500HM
Description: The HGW-BL1500HM router, versions 002.002.003 and earlier, contains a path traversal vulnerability within its USB storage file-sharing functionality. The file upload process does not properly sanitize or restrict file paths. This allows an attacker to specify arbitrary paths during file upload operations, potentially accessing, modifying, or creating files outside the intended directory.
Severity: High (CVSS v3.1 Score: 8.8)
Known Exploit: An attacker can exploit this vulnerability by crafting malicious HTTP requests to specific functions of the product from a device connected to the LAN side. This can lead to:
- File Disclosure: Reading sensitive files from the device’s file system.
- File Modification: Overwriting or altering existing files, potentially including configuration files or executable code.
- Arbitrary Code Execution: Uploading and executing malicious code on the device, leading to full system compromise.
Remediation:
Immediate Action: Discontinue Use or Disable USB File Sharing: The most immediate action is to stop using the affected HGW-BL1500HM router or disable the USB file-sharing functionality if possible, isolating the network from potential attacks.
Apply Firmware Update (Priority 1): The primary remediation is to apply a firmware update to the HGW-BL1500HM router provided by the manufacturer that addresses the path traversal vulnerability. Contact the manufacturer or check their website for the latest firmware version.
Input Validation: Ensure that the file upload functionality implements strict input validation. This includes:
- Whitelisting allowed characters: Only allow specific characters within file names.
- Canonicalization: Converting file paths to their absolute, normalized form to prevent manipulation using
..(dot-dot-slash) sequences. - Path Restriction: Enforcing a restricted directory for file uploads and preventing access outside of this directory.
Access Control: Implement proper access control mechanisms to restrict access to uploaded files based on user roles and permissions. Ensure that only authorized users can access or modify sensitive files.
Mitigation (if firmware update is unavailable):
If a firmware update is not immediately available, the following mitigations can be implemented to reduce the risk:
Network Segmentation: Segment the network to isolate the HGW-BL1500HM router from critical assets. This will limit the potential damage if the device is compromised.
Monitor Network Traffic: Monitor network traffic for suspicious activity, such as unusual file access patterns or attempts to access restricted directories.
Firewall Rules: Configure firewall rules to restrict access to the HGW-BL1500HM router from untrusted networks.
Disable UPnP: Disable Universal Plug and Play (UPnP) on the router to prevent external access to the device.
Change Default Credentials: Ensure the router’s default administrative credentials are changed to strong, unique passwords.
Long-Term Prevention:
Secure Development Practices: Implement secure development practices throughout the software development lifecycle to prevent vulnerabilities such as path traversal.
Regular Security Audits: Conduct regular security audits and penetration testing to identify and address vulnerabilities in the HGW-BL1500HM router’s firmware.
Vulnerability Disclosure Program: Establish a vulnerability disclosure program to encourage security researchers to report vulnerabilities responsibly.
Assigner
- JPCERT/CC [email protected]
Date
- Published Date: 2025-03-28 08:18:37
- Updated Date: 2025-03-28 18:11:40