CVE-2024-34338: Tenda O3 Firmware RCE Vulnerability

CVE-2024-34338 Overview

CVE-2024-34338 is a blind command injection vulnerability in the Tenda O3V2 outdoor wireless CPE running firmware versions V1.0.0.10 and V1.0.0.12. The flaw resides in the /goform/getTraceroute endpoint, where the dest parameter is passed to a shell without sanitization. Authenticated attackers can execute arbitrary operating system commands with root privileges on the device. The weakness is classified as CWE-77, Improper Neutralization of Special Elements used in a Command.

Critical Impact
Successful exploitation yields root-level command execution on the affected router, enabling full device takeover, persistent backdoors, and pivoting into the internal network.

Affected Products

Tenda O3 hardware version 2.0
Tenda O3 firmware V1.0.0.10
Tenda O3 firmware V1.0.0.12

Discovery Timeline

2024-05-14 - CVE-2024-34338 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-34338

Vulnerability Analysis

The Tenda O3V2 web management interface exposes a diagnostic endpoint at /goform/getTraceroute that invokes the underlying traceroute utility. The handler reads the dest HTTP parameter and concatenates it into a shell command string without validating or escaping metacharacters. An authenticated user can inject shell separators such as ;, &&, or backticks in the dest value to append arbitrary commands. Because the web server runs as root on the device, injected commands execute with the highest privilege level.

The issue is classified as blind command injection because the endpoint does not return standard command output to the caller. Attackers confirm execution through side channels such as time delays, outbound DNS or ICMP traffic, or file writes to the device filesystem. See the Exzettabyte Blind Command Injection Analysis for detailed reproduction steps.

Root Cause

The root cause is missing input validation on the dest parameter in the traceroute handler. The firmware passes user-controlled input directly into a system shell invocation instead of using a safe execution API or an allowlist of valid IP addresses and hostnames.

Attack Vector

Exploitation requires network access to the device management interface and valid administrator credentials. An attacker sends a crafted POST request to /goform/getTraceroute with a dest value containing shell metacharacters followed by arbitrary commands. The device executes the injected payload as root. Common paths to obtaining credentials include default password reuse, credential stuffing, and captured sessions from unencrypted management traffic.

No verified public exploit code is available. The vulnerability mechanism is described in prose by the referenced technical analysis rather than a released proof-of-concept.

Detection Methods for CVE-2024-34338

Indicators of Compromise

HTTP POST requests to /goform/getTraceroute containing shell metacharacters such as ;, |, &, $(, or backticks inside the dest parameter.
Unexpected outbound DNS, ICMP, or HTTP callbacks originating from Tenda O3V2 devices immediately following administrative sessions.
New or modified files in writable firmware paths, unexpected processes spawned by the web server, or unauthorized cron entries on the device.

Detection Strategies

Inspect web server and reverse proxy logs for requests to /goform/getTraceroute where the dest parameter deviates from a strict IP address or hostname pattern.
Deploy network intrusion detection signatures that flag command-injection metacharacters in HTTP request bodies destined for Tenda management interfaces.
Correlate authentication events on the device with subsequent outbound connections to untrusted destinations to identify post-authentication abuse.

Monitoring Recommendations

Segment IoT and network appliance management interfaces onto a restricted VLAN and log all access at the firewall.
Forward device syslog and administrative access logs to a centralized SIEM for retention and correlation.
Alert on repeated failed authentication attempts against Tenda O3V2 web interfaces, which often precede credentialed exploitation.

How to Mitigate CVE-2024-34338

Immediate Actions Required

Restrict access to the Tenda O3V2 management interface to a dedicated administrative network and block it from the internet and general user VLANs.
Rotate administrator credentials on all Tenda O3V2 devices and disable any shared or default accounts.
Audit recent administrative sessions and diagnostic endpoint usage for evidence of exploitation.

Patch Information

At the time of publication, no vendor advisory or firmware fix is linked in the NVD entry for CVE-2024-34338. Administrators should monitor the Tenda security portal for firmware updates addressing the /goform/getTraceroute handler and apply them as soon as they become available.

Workarounds

Disable remote management on WAN interfaces and permit management access only from trusted management hosts.
Place affected devices behind a firewall that inspects and blocks HTTP requests containing shell metacharacters in the dest parameter of /goform/getTraceroute.
Replace end-of-support or unpatched Tenda O3V2 units with devices that receive active security maintenance if a fixed firmware release is not published.

bash

# Example firewall rule to restrict management access to a jump host
iptables -A INPUT -p tcp --dport 80 -s 10.0.10.5 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -s 10.0.10.5 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP