Tenda AC6, Buffer Overflow, CVE-2025-29031 (Critical)

How the CVE Works:

CVE-2025-29031 is a critical buffer overflow vulnerability in Tenda AC6 routers, specifically in firmware version v15.03.05.16. The flaw resides in the `fromAddressNat` function, which fails to properly validate the length of user-supplied input. This allows an attacker to overwrite adjacent memory locations by sending a crafted payload exceeding the allocated buffer size. Successful exploitation can lead to remote code execution (RCE), enabling the attacker to take full control of the device. The vulnerability is particularly dangerous as it can be exploited remotely without authentication, making it a high-priority threat for affected users.

DailyCVE Form:

Platform: Tenda AC6
Version: v15.03.05.16
Vulnerability: Buffer Overflow
Severity: Critical
Date: 03/14/2025

What Undercode Say:

Exploitation:

1. Craft Payload: Create a malicious payload exceeding the buffer size of the `fromAddressNat` function.
2. Send Payload: Use a script to send the payload to the router’s vulnerable endpoint.
3. Gain Access: Exploit the overflow to execute arbitrary code on the device.

   import socket
   target_ip = "192.168.1.1"
   target_port = 80
   payload = b"A" 1000 Example buffer overflow payload
   sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
   sock.connect((target_ip, target_port))
   sock.send(payload)
   sock.close()
   

Protection:

1. Update Firmware: Apply the latest firmware update from Tenda to patch the vulnerability.
2. Input Validation: Implement strict input validation in the `fromAddressNat` function.
3. Network Segmentation: Isolate the router from critical network segments to limit potential damage.

   Check for firmware updates
   curl -X GET "https://www.tenda.com/firmware/AC6"
   Apply firewall rules to restrict access
   iptables -A INPUT -p tcp --dport 80 -s trusted_ip -j ACCEPT
   iptables -A INPUT -p tcp --dport 80 -j DROP
   

Analytics:

• CVSS Score: 9.8 (Critical)
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: High
• Integrity Impact: High
• Availability Impact: High

References:

• bash
• bash
• bash

References:

Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-29031
Extra Source Hub:
Undercode

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