CVE-2024-28353: Trendnet TEW-827DRU Firmware RCE Flaw

CVE-2024-28353 Overview

CVE-2024-28353 is a command injection vulnerability in the TRENDnet TEW-827DRU wireless router running firmware version 2.10B01. The flaw resides in the apply.cgi interface, which fails to sanitize the usapps.config.smb_admin_name POST parameter before passing it to a system shell. An authenticated attacker can inject arbitrary operating system commands through this parameter and obtain a root shell on the device. The vulnerability is tracked under CWE-77: Improper Neutralization of Special Elements used in a Command.

Critical Impact
Successful exploitation yields root-level command execution on the router, enabling full device takeover, traffic interception, and lateral movement into the connected network.

Affected Products

TRENDnet TEW-827DRU router (hardware)
TRENDnet TEW-827DRU firmware version 2.10B01
Any deployment exposing the apply.cgi administrative interface

Discovery Timeline

2024-03-15 - CVE-2024-28353 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-28353

Vulnerability Analysis

The TEW-827DRU exposes an administrative HTTP endpoint at apply.cgi that processes configuration changes submitted through POST requests. One of these configuration fields, usapps.config.smb_admin_name, sets the administrative username for the router's Samba (SMB) file sharing service. The handler concatenates the attacker-supplied value into a shell command without escaping or validating shell metacharacters. As a result, characters such as ;, |, backticks, and $() are interpreted by the underlying shell.

Because the web server on TRENDnet consumer routers typically runs as root, injected commands execute with root privileges. An attacker who authenticates to the web interface, or who leverages CSRF or default credentials, can pivot from configuration access to full command execution.

Root Cause

The root cause is missing input neutralization on the usapps.config.smb_admin_name POST parameter within apply.cgi. The firmware passes user-controlled input directly to a shell interpreter, likely through a system(), popen(), or backtick invocation in the SMB configuration routine. No allowlist, character filter, or safe execution API is applied before the shell invocation.

Attack Vector

The attack is delivered over the network to the router's management interface. The attacker sends a crafted POST request to apply.cgi containing shell metacharacters inside the usapps.config.smb_admin_name field. The router's CGI handler processes the parameter, invokes the shell, and executes the injected commands as root. Authenticated access to the administrative interface is required, though this can often be obtained through default credentials, credential reuse, or session hijacking on internal networks.

No public proof-of-concept exploit is listed in Exploit-DB, and CVE-2024-28353 is not present on the CISA Known Exploited Vulnerabilities catalog. Additional technical notes are documented in the researcher writeup for TEW-827DRU.

Detection Methods for CVE-2024-28353

Indicators of Compromise

POST requests to apply.cgi containing shell metacharacters such as ;, |, &, backticks, or $( inside the usapps.config.smb_admin_name parameter.
Unexpected outbound connections originating from the router to attacker-controlled infrastructure after configuration changes.
New or modified Samba administrator account names that contain non-alphanumeric characters.
Router configuration entries or startup scripts referencing binaries such as wget, curl, busybox nc, or telnetd that were not previously present.

Detection Strategies

Inspect HTTP request bodies destined for the router management interface for shell metacharacters in SMB configuration fields.
Monitor network egress from router management VLANs for connections that do not match legitimate firmware update or DDNS traffic.
Baseline the router's configuration and alert on drift in Samba-related parameters.

Monitoring Recommendations

Forward router syslog, if enabled, to a central log platform and alert on repeated failed authentications to apply.cgi.
Track DNS queries from the router itself; consumer routers rarely resolve arbitrary external hostnames outside of vendor domains.
Alert on new listening ports on the router's WAN or LAN interfaces that were not part of the shipped configuration.

How to Mitigate CVE-2024-28353

Immediate Actions Required

Restrict access to the router's web administration interface to trusted management hosts only, and disable remote WAN administration.
Change default administrator credentials and enforce a strong, unique password for the web interface.
Disable the SMB file sharing service on the router if it is not required for business operations.
Segment the router's management VLAN away from user and guest networks to limit authenticated attack paths.

Patch Information

At the time of publication, no vendor advisory or fixed firmware version is listed in the NVD entry for CVE-2024-28353. Administrators should monitor the TRENDnet support portal for updated firmware releases addressing the apply.cgi command injection, and apply any newer firmware than 2.10B01 as soon as it becomes available.

Workarounds

Place the router behind a network access control list that restricts apply.cgi access to a dedicated management workstation.
Disable the SMB administrative configuration path if the Samba service is not required.
Replace end-of-life or unpatched consumer routers in production environments with vendor-supported models that receive active security updates.

bash

# Example: restrict management interface access at an upstream firewall
# Allow only the management workstation 10.0.0.10 to reach the router at 10.0.0.1
iptables -A FORWARD -s 10.0.0.10 -d 10.0.0.1 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -s 10.0.0.10 -d 10.0.0.1 -p tcp --dport 443 -j ACCEPT
iptables -A FORWARD -d 10.0.0.1 -p tcp --dport 80 -j DROP
iptables -A FORWARD -d 10.0.0.1 -p tcp --dport 443 -j DROP