CVE-2024-2353 Overview
CVE-2024-2353 is an operating system command injection vulnerability affecting the Totolink X6000R router running firmware version 9.4.0cu.852_B20230719. The flaw resides in the setDiagnosisCfg function of the /cgi-bin/cstecgi.cgi endpoint within the shttpd component. Attackers can manipulate the ip argument to inject arbitrary operating system commands. The vulnerability is remotely exploitable and has been publicly disclosed under identifier VDB-256313. The vendor was contacted before disclosure but did not respond, leaving affected devices without an official patch.
Critical Impact
Remote attackers can execute arbitrary operating system commands on affected Totolink X6000R devices, leading to full device compromise and potential lateral movement into connected networks.
Affected Products
- Totolink X6000R router (hardware)
- Totolink X6000R firmware version 9.4.0cu.852_B20230719
- Deployments exposing the shttpd web management interface
Discovery Timeline
- 2024-03-10 - CVE-2024-2353 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-2353
Vulnerability Analysis
The vulnerability is an OS command injection flaw classified under [CWE-78]. It affects the setDiagnosisCfg handler exposed by the cstecgi.cgi binary served by the shttpd web server on the Totolink X6000R. The handler processes network diagnostic configuration requests, including an ip parameter intended to hold a target address for diagnostics such as ping or traceroute. The device passes this parameter into a shell command without sufficient sanitization or argument escaping. An attacker can append shell metacharacters to the ip value to break out of the intended command context and execute arbitrary commands as the web service user, which typically runs with root privileges on embedded router firmware.
Root Cause
The root cause is missing input validation in the setDiagnosisCfg function. The function concatenates user-controlled input directly into a shell invocation instead of using safe execution primitives or strict allowlists for IP address formatting. Because the shttpd component processes requests over the network-facing management interface, the injection point is reachable from any client that can send HTTP requests to the device.
Attack Vector
Exploitation requires network access to the router's HTTP management interface. The attacker sends a crafted HTTP request to /cgi-bin/cstecgi.cgi invoking the setDiagnosisCfg action with a malicious ip argument containing shell metacharacters such as semicolons, backticks, or command substitution syntax. The injected payload runs in the context of the web server process. Successful exploitation grants command execution on the device, enabling persistence, credential theft, DNS hijacking, or pivoting to internal hosts. Technical proof-of-concept details are published in the GitHub RCE vulnerability report and the VulDB advisory.
Detection Methods for CVE-2024-2353
Indicators of Compromise
- HTTP POST requests to /cgi-bin/cstecgi.cgi referencing the setDiagnosisCfg topic or function name
- Values in the ip parameter containing shell metacharacters such as ;, |, &, `, $(, or newline sequences
- Unexpected outbound connections originating from the router to attacker-controlled infrastructure
- New or modified processes on the device spawned by the shttpd or cstecgi.cgi parent process
Detection Strategies
- Inspect network traffic for requests to cstecgi.cgi where request bodies contain non-IP characters in fields expecting an IP address.
- Log and alert on any administrative interface access from untrusted network segments, including the WAN interface.
- Correlate router-originating DNS lookups or connections to previously unseen external hosts as potential post-exploitation activity.
Monitoring Recommendations
- Forward router syslog and management-plane access logs to a centralized logging platform for review.
- Baseline expected administrative source IP addresses and alert on deviations.
- Monitor for firmware or configuration changes made outside of scheduled maintenance windows.
How to Mitigate CVE-2024-2353
Immediate Actions Required
- Restrict access to the router's HTTP management interface to trusted management VLANs or specific administrator IP addresses only.
- Disable remote WAN-side administration on all Totolink X6000R devices.
- Rotate administrative credentials and any secrets stored on or accessed through the affected devices.
- Inventory all Totolink X6000R units running firmware 9.4.0cu.852_B20230719 and prioritize replacement or isolation.
Patch Information
No vendor patch is available. Totolink did not respond to disclosure attempts prior to public release of CVE-2024-2353. Consult the VulDB CVE analysis for updated advisory status and monitor the vendor's support channels for future firmware releases addressing the setDiagnosisCfg command injection.
Workarounds
- Place affected routers behind a network segmentation boundary that blocks untrusted access to TCP ports serving the management interface.
- Replace the affected device with a supported model from a vendor that provides current security updates if no patch becomes available.
- Where feasible, deploy a firewall rule denying inbound traffic to /cgi-bin/cstecgi.cgi from any source other than approved management workstations.
# Example iptables rule restricting access to the router management interface
# Replace 192.0.2.10 with the trusted administrator IP address
iptables -A INPUT -p tcp --dport 80 -s 192.0.2.10 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 192.0.2.10 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
