CVE-2024-0573: Critical Vulnerability in Totolink LR1200GB Leading to Potential System Compromise

Overview

The cybersecurity world is currently dealing with a significant vulnerability, CVE-2024-0573, discovered in the popular Totolink LR1200GB 9.1.0u.6619_B20230130. This vulnerability, classified as critical, is already drawing significant attention due to the potential for system compromise or data leakage. The vulnerability’s critical nature, combined with the fact that the exploit has been publicly disclosed, makes it a serious issue for any organization using the affected versions of Totolink LR1200GB.

Vulnerability Summary

CVE ID: CVE-2024-0573
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: Potential for system compromise and data leakage

Affected Products

Product | Affected Versions

Totolink LR1200GB | 9.1.0u.6619_B20230130

How the Exploit Works

This vulnerability stems from a flaw in the setDiagnosisCfg function of the /cgi-bin/cstecgi.cgi file. This flaw allows for an overflow in the stack-based buffer when the ‘ip’ argument is manipulated, leading to the potential for an attacker to execute arbitrary code. The attack can be launched remotely, adding to its severity and potential for widespread impact.

Conceptual Example Code

Below is a conceptual example of how the vulnerability might be exploited. This is a hypothetical HTTP request that manipulates the ‘ip’ argument in a malicious way.

POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
setDiagnosisCfg=1&ip=127.0.0.1;%20/bin/bash%20-c%20'cat%20/etc/passwd'

In this example, the attacker sends a POST request that manipulates the ‘ip’ argument. The additional command after the IP address (`/bin/bash -c ‘cat /etc/passwd’`) is an example of a command that an attacker might use to exploit the buffer overflow and execute arbitrary code.

Mitigation

Users of the affected version of Totolink LR1204GB should immediately apply the patch provided by the vendor. If the vendor patch is not available, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as a temporary mitigation measure. Regularly update your systems to ensure you are protected from this and other vulnerabilities.
Note: The vendor has been contacted about this disclosure but has not yet provided a response or a patch to address this vulnerability.