CVE-2024-9001: Totolink T10 Firmware RCE Vulnerability

CVE-2024-9001 Overview

CVE-2024-9001 is an operating system command injection vulnerability in the TOTOLINK T10 router running firmware version 4.1.8cu.5207. The flaw resides in the setTracerouteCfg function within /cgi-bin/cstecgi.cgi. Attackers can manipulate the command argument to inject arbitrary operating system commands. The attack is remotely exploitable over the network and requires only low-level privileges. The exploit details have been publicly disclosed, increasing the risk of in-the-wild abuse. The vendor was contacted prior to disclosure but did not respond, leaving affected devices without an official patch at the time of publication.

Critical Impact

Remote attackers with low privileges can execute arbitrary OS commands on affected TOTOLINK T10 routers, enabling device takeover and pivoting into internal networks.

Affected Products

• TOTOLINK T10 router (hardware version 2.0)
• TOTOLINK T10 firmware 4.1.8cu.5207
• /cgi-bin/cstecgi.cgi component implementing the setTracerouteCfg handler

Discovery Timeline

• 2024-09-19 - CVE-2024-9001 published to the National Vulnerability Database (NVD)
• 2024-09-24 - Last updated in NVD database

Technical Details for CVE-2024-9001

Vulnerability Analysis

The vulnerability is classified under [CWE-78] Improper Neutralization of Special Elements used in an OS Command. The affected handler is setTracerouteCfg, exposed through the Common Gateway Interface (CGI) binary /cgi-bin/cstecgi.cgi. The handler accepts a command parameter from authenticated HTTP requests and passes it to an underlying shell interpreter without sanitization. Attackers can append shell metacharacters such as semicolons or backticks to execute additional commands alongside the intended traceroute operation. The Exploit Prediction Scoring System (EPSS) places this issue at 0.768% with a 73.668 percentile ranking, indicating moderate near-term exploitation likelihood relative to other published CVEs.

Root Cause

The root cause is missing input validation and sanitization on the command argument processed by setTracerouteCfg. The function constructs a shell command string by concatenating user input directly into a system()-style call. Without escaping or allowlist filtering, any shell metacharacter terminates the original command and starts attacker-controlled execution.

Attack Vector

The attack vector is network-based and requires low-level authenticated access to the router's web interface. An attacker submits a crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the setTracerouteCfg topicid. The command field carries a payload combining a benign target host with injected shell operators. The CGI binary forwards the concatenated string to the embedded BusyBox shell, which executes both the intended traceroute and the attacker-supplied commands with router privileges. Public disclosure on GitHub provides the request structure required to reproduce the issue. See the GitHub Configuration Script and VulDB #278152 for the documented request format.

Detection Methods for CVE-2024-9001

Indicators of Compromise

• HTTP POST requests to /cgi-bin/cstecgi.cgi containing the setTracerouteCfg topic identifier combined with shell metacharacters such as ;, |, &, or backticks in the command field.
• Unexpected outbound network connections originating from the router's management plane to attacker-controlled infrastructure.
• New or modified processes on the router, including spawned shells or download utilities such as wget or tftp invoked from the CGI process tree.

Detection Strategies

• Inspect web server and CGI logs for setTracerouteCfg requests where the command parameter contains characters outside the expected IP address or hostname character set.
• Deploy network intrusion detection signatures matching POST bodies to cstecgi.cgi with shell metacharacters in tracked parameters.
• Correlate router authentication events with administrative configuration changes to surface low-privilege sessions issuing diagnostic commands.

Monitoring Recommendations

• Forward router syslog and HTTP access logs to a centralized analytics platform for retention and detection rule execution.
• Monitor DNS and egress traffic from router management interfaces, since command injection often results in callbacks or secondary payload retrieval.
• Track firmware version inventory across deployed TOTOLINK devices to identify hosts running the vulnerable 4.1.8cu.5207 build.

How to Mitigate CVE-2024-9001

Immediate Actions Required

• Restrict access to the router's web management interface to trusted management VLANs and remove any wide-area network (WAN) exposure of /cgi-bin/cstecgi.cgi.
• Rotate administrative credentials and disable unused low-privilege accounts that could be used to reach the setTracerouteCfg endpoint.
• Replace devices running firmware 4.1.8cu.5207 with supported hardware if the vendor does not publish a fix.

Patch Information

No vendor patch is available at the time of publication. According to the NVD entry and VulDB record, the vendor was contacted before public disclosure but did not respond. Monitor the TOTOLINK Official Website for firmware updates addressing the setTracerouteCfg command injection.

Workarounds

• Place affected TOTOLINK T10 routers behind a network segment that blocks inbound HTTP and HTTPS traffic to the management interface from untrusted sources.
• Disable remote administration features and ensure the router web UI is only reachable from a hardened jump host.
• Apply upstream web application firewall (WAF) rules that drop requests to cstecgi.cgi containing shell metacharacters in known parameters.

# Example firewall rule restricting management access to a trusted subnet
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP