CVE-2025-3346
Remediation/Mitigation Strategy for CVE-2025-3346
Vulnerability Description:
- Vulnerability: Buffer Overflow
- Affected Software: Tenda AC7
- Affected Version: 15.03.06.44
- Affected Function:
formSetPPTPServerin/goform/SetPptpServerCfg - Attack Vector: Remote
- Attack Surface: The
pptp_server_start_ipandpptp_server_end_iparguments are vulnerable to buffer overflows.
Severity:
- CVSS Score: 9.0 (Critical)
- Impact: Successful exploitation can lead to arbitrary code execution, allowing attackers to gain full control of the device. This can result in data compromise, denial of service, and potentially lateral movement within a network.
Known Exploit:
- Exploit Status: Publicly disclosed and may be used. This means attackers have access to the technical details needed to exploit this vulnerability.
Mitigation/Remediation Steps:
Immediate Action: Patch/Upgrade Firmware: The primary and most effective solution is to upgrade to a patched version of the Tenda AC7 firmware provided by the vendor (Tenda). Check the Tenda website for available updates. Apply the update immediately upon release.
Workaround (if patch unavailable): If a patch is not immediately available, consider the following workarounds, although these are less effective than a full patch:
- Disable PPTP Server: If you are not actively using the PPTP server functionality, disable it. This removes the attack surface. Access the router’s web interface, navigate to the PPTP server settings, and disable the feature.
- Network Segmentation: Isolate the Tenda AC7 router on a separate network segment with limited access to other critical systems. This can contain the impact of a successful exploit.
- Input Validation (Difficult without Source Code): If technically feasible, attempt to implement client-side input validation on the web interface to limit the length and format of
pptp_server_start_ipandpptp_server_end_iparguments. However, this is usually ineffective against determined attackers and should not be relied upon as a primary defense.
Long-Term Actions:
- Monitor for Updates: Continuously monitor the Tenda website and security advisories for updates related to this or other vulnerabilities.
- Review Router Configuration: Review the router’s configuration settings to ensure that all other security features (e.g., strong passwords, firewall rules) are properly configured.
- Consider Router Replacement: If Tenda does not provide timely updates or ongoing security support, consider replacing the router with a more secure and actively maintained alternative.
Detection and Monitoring:
- Intrusion Detection/Prevention Systems (IDS/IPS): If applicable, configure your network’s IDS/IPS to detect and block attempts to exploit this buffer overflow. Look for signatures related to malformed
pptp_server_start_iporpptp_server_end_iprequests. - Log Analysis: Monitor router logs for suspicious activity, such as unusually long strings in the
pptp_server_start_ipandpptp_server_end_ipfields or unexpected system crashes.
- Intrusion Detection/Prevention Systems (IDS/IPS): If applicable, configure your network’s IDS/IPS to detect and block attempts to exploit this buffer overflow. Look for signatures related to malformed
Disclaimer: These steps are provided as general guidance. The specific steps required to mitigate the vulnerability may vary depending on your network environment and technical expertise. Always back up your router configuration before making any changes.
Assigner
- VulDB [email protected]
Date
- Published Date: 2025-04-07 09:31:09
- Updated Date: 2025-04-07 14:17:50