CVE-2024-7215 Overview
CVE-2024-7215 is a command injection vulnerability affecting TOTOLINK LR1200 routers running firmware version 9.3.1cu.2832. The flaw resides in the NTPSyncWithHost function within /cgi-bin/cstecgi.cgi. Attackers can manipulate the host_time argument to inject arbitrary operating system commands. The vulnerability is remotely exploitable and has been publicly disclosed under identifier VDB-272786. The vendor was contacted about this disclosure but did not respond. This class of weakness is tracked as CWE-77: Improper Neutralization of Special Elements used in a Command.
Critical Impact
Authenticated remote attackers can execute arbitrary shell commands on affected TOTOLINK LR1200 devices, potentially gaining full control of the router and pivoting into connected networks.
Affected Products
- TOTOLINK LR1200 hardware appliance
- TOTOLINK LR1200 firmware version 9.3.1cu.2832
- Deployments exposing the /cgi-bin/cstecgi.cgi endpoint
Discovery Timeline
- 2024-07-30 - CVE-2024-7215 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-7215
Vulnerability Analysis
The TOTOLINK LR1200 exposes a CGI handler at /cgi-bin/cstecgi.cgi that dispatches requests to internal functions based on request parameters. The NTPSyncWithHost function accepts a host_time parameter intended to specify an NTP host. The firmware fails to sanitize this input before passing it to a shell interpreter, allowing shell metacharacters to break out of the intended command context.
An attacker who reaches the CGI endpoint can append arbitrary commands to host_time using shell separators such as ;, |, or backticks. Because CGI scripts on embedded routers commonly execute as root, injected commands run with the highest privilege level available on the device. The EPSS score of 3.347% (87th percentile) reflects notable interest relative to the broader CVE population.
Root Cause
The root cause is missing input validation and unsafe concatenation of user-supplied data into a shell command string. The firmware treats the host_time argument as trusted input rather than applying an allowlist for hostnames or IP addresses. No neutralization of shell metacharacters is performed before invoking the underlying system utility responsible for NTP synchronization.
Attack Vector
Exploitation requires network reachability to the router's web management interface and low-privilege authentication. An attacker submits a crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the NTPSyncWithHost action with a host_time value containing embedded shell commands. Successful exploitation yields command execution on the device, enabling firmware modification, credential theft, traffic interception, or use of the router as a beachhead. Public proof-of-concept details are available in the GitHub IoT Vulnerability Guide and the VulDB CTI Report #272786.
No verified exploit code is reproduced here. See the linked references for technical proof-of-concept details.
Detection Methods for CVE-2024-7215
Indicators of Compromise
- HTTP requests to /cgi-bin/cstecgi.cgi containing the string NTPSyncWithHost combined with shell metacharacters such as ;, |, &, $(, or backticks in the host_time parameter.
- Unexpected outbound connections from the router to attacker-controlled hosts following NTP-related requests.
- Unauthorized configuration changes, new accounts, or unusual firmware behavior on LR1200 devices.
Detection Strategies
- Inspect web server and CGI logs on the router (where accessible) for POST requests to cstecgi.cgi with anomalous host_time values.
- Deploy network intrusion detection signatures that flag command injection patterns in HTTP request bodies targeting embedded management interfaces.
- Correlate management-plane HTTP traffic with subsequent outbound connections from router IP addresses to catch post-exploitation callbacks.
Monitoring Recommendations
- Forward router syslog and NetFlow data to a centralized analytics platform for behavioral baselining.
- Alert on management interface access originating from non-administrative network segments or external IP ranges.
- Track firmware version drift and unauthorized configuration changes across all TOTOLINK LR1200 devices in the fleet.
How to Mitigate CVE-2024-7215
Immediate Actions Required
- Restrict access to the router's web management interface so that only trusted administrative networks can reach /cgi-bin/cstecgi.cgi.
- Disable remote (WAN-side) management on affected LR1200 devices until a vendor patch is available.
- Rotate administrative credentials and audit existing accounts on each affected device.
- Inspect devices for signs of compromise, including unexpected processes, cron entries, and modified configuration files.
Patch Information
No vendor patch has been published at the time of writing. TOTOLINK did not respond to the coordinated disclosure attempt referenced in VulDB #272786. Organizations should monitor the TOTOLINK support portal for firmware updates addressing the NTPSyncWithHost command injection and apply them as soon as they become available.
Workarounds
- Place LR1200 devices behind a firewall that blocks inbound access to TCP ports used by the web management interface from untrusted networks.
- Segment the router's management VLAN from user and guest networks to limit exposure of the CGI endpoint.
- Consider replacing end-of-support LR1200 hardware if the vendor does not release a fix within an acceptable timeframe.
# Example: block WAN-side access to the router management interface using iptables on an upstream firewall
iptables -A FORWARD -d <ROUTER_IP> -p tcp --dport 80 -j DROP
iptables -A FORWARD -d <ROUTER_IP> -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.
