CVE-2022-44258 - TOTOLINK LR350 V9.3.5u.6369_B20220309 Post-authentication Buffer Overflow Vulnerability in setTracerouteCfg Function

Overview
A newly discovered vulnerability, CVE-2022-44258, affects the TOTOLINK LR350 router with firmware version V9.3.5u.6369_B20220309. This vulnerability is a post-authentication buffer overflow that occurs via the 'command' parameter in the 'setTracerouteCfg' function. Exploiting this vulnerability can lead to potential remote code execution and unauthorized access to the router, compromising the security of connected devices.

Exploit Details

This buffer overflow vulnerability is triggered by a maliciously crafted HTTP POST request sent to the TOTOLINK LR350 router after successful authentication. The exploit involves a specific value in the 'command' parameter of the 'setTracerouteCfg' function, causing a buffer overflow and potential remote code execution.

The following code snippet demonstrates the HTTP POST request with the malicious 'command' parameter

POST /boafrm/formPing HTTP/1.1
Host: target_router_ip
Content-Length: 150
Content-Type: application/x-www-form-urlencoded
Cookie: SESSIONID=[VALID_SESSION_ID]

command=AAAA...AAAA&traceroute_time=1&traceroute_diagnostic=

In this example, 'AAAA...AAAA' represents the malicious payload, which has been crafted to exploit the buffer overflow vulnerability. The payload length is critical in exploiting the buffer overflow, and it should be precisely set to overwrite specific memory locations.

It is important to note that successful exploitation requires a valid session ID, which can be obtained through social engineering, phishing, or other authentication-bypassing techniques.

Original References

You can find more information about the vulnerability, its discovery, and its potential impact in the following references:

1. CVE Details: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-44258
2. Exploit Database: https://www.exploit-db.com/exploits/52227
3. Vulnerability Advisory: https://www.tw.cert.org/onelab/alert/detail/Alert-00013
4. TOTOLINK Official Website: http://www.totolink.net/

Recommendations

If you own a TOTOLINK LR350 router with firmware version V9.3.5u.6369_B20220309, it is recommended to take the following actions to protect your devices and network:

1. Check for firmware updates from the TOTOLINK official website and apply updates as soon as they are available.
2. Implement strong and unique passwords for the router's administrator account, and avoid using default or easily guessable passwords.
3. Restrict access to the router's management interface to authorized users and devices only, and disable remote management if it's not required.
4. Monitor your network for any suspicious activities that may indicate unauthorized access or exploitation attempts.

By taking these steps, you can significantly reduce the risk of falling victim to this or other similar vulnerabilities that may affect your router and connected devices. Be sure to stay vigilant and informed about any new threats, and always follow best practices for securing your home or business network.

Timeline

Published on: 11/23/2022 16:15:00 UTC
Last modified on: 11/26/2022 03:44:00 UTC