Overview
A critical vulnerability has been discovered in Totolink’s LR1200GB 9.1.0u.6619_B20230130 routers, having the potential to affect millions of devices worldwide. This vulnerability, identified as CVE-2024-0577, could allow a remote attacker to compromise the system and potentially access sensitive data. Given the severity of this exploit and its potential impact, it’s crucial for organizations and individuals using this router model to understand the risk and apply necessary security measures.
Vulnerability Summary
CVE ID: CVE-2024-0577
Severity: Critical (CVSS: 8.8)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
No phone number, email, or personal info required.
Product | Affected Versions
Totolink LR1200GB | 9.1.0u.6619_B20230130
How the Exploit Works
This vulnerability lies in the setLanguageCfg function of the /cgi-bin/cstecgi.cgi file. The improper handling of the ‘lang’ argument in the function results in a stack-based buffer overflow vulnerability. This allows an attacker to manipulate the argument to execute arbitrary code or cause a denial of service. Since the attack can be initiated remotely, the vulnerability presents an elevated risk.
Conceptual Example Code
An attacker could exploit this vulnerability by sending a malicious HTTP POST request to the affected router. Below is a theoretical example of how such a request might look:
POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: <Router IP>
Content-Type: application/x-www-form-urlencoded
lang=`python -c 'print "A"*6000'`In this example, the ‘lang’ parameter is filled with a large number of ‘A’ characters. This could cause a stack-based buffer overflow, allowing an attacker to execute arbitrary code or cause a denial of service.
Mitigation
The most effective solution is to apply a vendor-supplied patch as soon as it becomes available. In the meantime, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation by protecting against suspicious HTTP requests. This, however, is only a stop-gap measure and may not fully protect against all potential exploits. Regularly monitoring network traffic and system logs for suspicious activity can also help detect any attempts to exploit this vulnerability.