CVE-2025-29100

Okay, here’s a remediation/mitigation strategy based on the provided CVE data, formatted in Markdown:

CVE-2025-29100: Buffer Overflow in Tenda AC8 Router

1. Vulnerability Description:

  • Vulnerability: Buffer Overflow
  • Affected Product: Tenda AC8 Router
  • Affected Firmware Version: V16.03.34.06
  • Location: fromSetRouteStatic function
  • Parameter: list

The Tenda AC8 router, firmware version V16.03.34.06, contains a buffer overflow vulnerability within the fromSetRouteStatic function. This vulnerability is triggered by the list parameter. An attacker can potentially overwrite memory buffers by providing a specially crafted, excessively long input to the list parameter, leading to a denial-of-service (DoS) condition or, potentially, arbitrary code execution.

2. Severity:

  • CVSS v3.x Score: 9.8 (Critical)
    • CVSS v3.x Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (Network, Low Attack Complexity, No Privileges Required, No User Interaction, Unchanged Scope, High Confidentiality, High Integrity, High Availability)

The vulnerability has a critical severity rating, indicating a high risk. The vector string indicates the following:

  • AV:N (Attack Vector: Network): The vulnerability can be exploited over the network, making it remotely exploitable.
  • AC:L (Attack Complexity: Low): The conditions required to exploit this vulnerability are easily achievable.
  • PR:N (Privileges Required: None): No authentication or special privileges are required to exploit the vulnerability.
  • UI:N (User Interaction: None): No user interaction is required to exploit the vulnerability.
  • S:U (Scope: Unchanged): An exploited vulnerability can only affect resources managed by the same authority.
  • C:H (Confidentiality: High): There is a high impact to confidentiality.
  • I:H (Integrity: High): There is a high impact to integrity.
  • A:H (Availability: High): There is a high impact to availability.

3. Known Exploit Information:

While the provided data does not explicitly state a publicly available exploit, the CVSS score and vulnerability type strongly suggest that exploitation is possible. Given the critical severity and low attack complexity, it is reasonable to assume that an exploit could be developed or has already been developed.

4. Remediation / Mitigation Strategy:

The following steps should be taken to address this vulnerability:

  • Immediate Action: Disconnect from Internet (If Possible): If immediate patching is not possible, consider disconnecting the Tenda AC8 router from the internet to minimize the risk of exploitation. This will prevent external attackers from reaching the device.

  • Apply Firmware Update (Preferred):

    • Check for Updates: Visit the Tenda website (www.tenda.com.cn) or the support section of the router’s web interface to check for available firmware updates.
    • Download Firmware: Download the latest firmware version released by Tenda that addresses this vulnerability. Verify the integrity of the downloaded firmware using checksums provided by Tenda to ensure it has not been tampered with.
    • Apply Firmware Update: Follow the instructions provided by Tenda to apply the firmware update to the router. Ensure the update process is not interrupted. A failed firmware update can brick the device.

  • Workarounds (If Firmware Update Is Not Immediately Available):

    • Disable Remote Management: If possible, disable remote management access to the router. This will prevent attackers from exploiting the vulnerability over the internet. This is usually found in the router’s administration interface under “Remote Access” or similar.
    • Access Control Lists (ACLs): If the router supports Access Control Lists (ACLs), restrict access to the router’s web interface and other management services to only trusted IP addresses. This is a more advanced workaround and requires careful configuration.
    • Disable UPnP: Universal Plug and Play (UPnP) can sometimes be exploited. Disabling it can reduce the attack surface. This option can be found in the router’s settings.
    • Reduce Exposure: If possible, place the router behind a more secure firewall.

  • Long-Term Security Practices:

    • Regular Firmware Updates: Make it a habit to regularly check for and apply firmware updates to all network devices.
    • Strong Passwords: Use strong, unique passwords for the router’s web interface and Wi-Fi network. Change default passwords immediately.
    • Network Segmentation: If possible, segment your network to isolate sensitive devices from less trusted devices.
    • Intrusion Detection/Prevention Systems (IDS/IPS): Consider implementing an intrusion detection or prevention system to monitor network traffic for malicious activity.

5. Vendor Communication:

  • Contact Tenda Support: Contact Tenda support to report the vulnerability and request an expedited firmware update. Provide them with the CVE number (CVE-2025-29100).
  • Monitor for Updates: Monitor security advisories from Tenda for updates on this vulnerability and other potential security issues.

Important Considerations:

  • Testing: Before applying any firmware update to a production environment, it is recommended to test the update in a lab or test environment to ensure it does not introduce any new issues.
  • Backups: Before applying any firmware update, back up the router’s configuration.
  • User Education: Educate users on the importance of strong passwords and safe browsing habits to reduce the risk of social engineering attacks that could lead to exploitation.

This remediation strategy is based on the information provided and general security best practices. The specific steps required may vary depending on your network configuration and risk tolerance. Always consult the vendor’s documentation for the most accurate and up-to-date information.

Assigner

Date

  • Published Date: 2025-03-24 21:15:18
  • Updated Date: 2025-03-26 15:16:18

More Details

CVE-2025-29100