Overview
This report outlines a critical vulnerability in Totolink N200RE 9.3.5u.6139_B20201216. This vulnerability has been identified as CVE-2024-0298 and poses a significant risk due to its ability to facilitate OS command injection, potentially leading to system compromise or data leakage. Given the severity of this vulnerability, it is crucial for affected parties to understand and take steps to mitigate this risk.
Vulnerability Summary
CVE ID: CVE-2024-0298
Severity: Critical (CVSS: 7.3)
Attack Vector: Remote
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage
Affected Products
Product | Affected Versions
Totolink N200RE | 9.3.5u.6139_B20201216
How the Exploit Works
The vulnerability exists within the function setDiagnosisCfg of the file /cgi-bin/cstecgi.cgi. An attacker can manipulate the ‘ip’ argument to inject operating system commands. These commands are then executed by the system, granting the attacker the ability to compromise the system or potentially exfiltrate data.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. This example shows an HTTP request where the ‘ip’ argument is manipulated to inject a malicious OS command:
POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: target.example.com
Content-Type: application/x-www-form-urlencoded
function=setDiagnosisCfg&ip=127.0.0.1;%20malicious_os_commandThis command would result in the system executing the ‘malicious_os_command’ after setting the diagnosis configuration.
Recommended Mitigation
It’s recommended that users apply the vendor’s patch once it becomes available. Until then, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can be used as a temporary mitigation to block or detect attempts to exploit this vulnerability.
