CVE-2024-7443: Vivotek IB8367A Firmware RCE Vulnerability

CVE-2024-7443 Overview

CVE-2024-7443 is a command injection vulnerability [CWE-77] in the Vivotek IB8367A network camera running firmware VVTK-0100b. The flaw resides in the getenv function call inside upload_file.cgi, where the QUERY_STRING argument is passed to a command interpreter without sanitization. Remote attackers with low-privilege access can inject operating system commands over the network. The affected product is end-of-life and no longer supported by the vendor, meaning no official patch will be released. The vulnerability was assigned identifier VDB-273528 and published to the National Vulnerability Database on August 3, 2024.

Critical Impact

Authenticated remote attackers can inject arbitrary operating system commands through the QUERY_STRING parameter handled by upload_file.cgi, with no vendor patch available because the device is end-of-life.

Affected Products

• Vivotek IB8367A network camera
• Vivotek IB8367A firmware version VVTK-0100b
• All end-of-life IB8367A release trees confirmed by the vendor

Discovery Timeline

• 2024-08-03 - CVE-2024-7443 published to NVD
• 2024-08-06 - Last updated in NVD database

Technical Details for CVE-2024-7443

Vulnerability Analysis

The Vivotek IB8367A exposes a CGI endpoint, upload_file.cgi, that processes HTTP requests on the camera's embedded web server. The handler retrieves the raw query string using the getenv("QUERY_STRING") C library call and then passes that data to a shell or system-level command without input validation. An attacker who can reach the web interface and supply low-privilege credentials can append shell metacharacters to the query string. The injected payload executes with the privileges of the CGI process, typically root on embedded Linux devices.

Root Cause

The root cause is improper neutralization of special elements used in an OS command [CWE-77]. The upload_file.cgi binary trusts user-controlled environment data returned by getenv and concatenates it into a command string. Embedded device CGI handlers often rely on system(), popen(), or backtick execution, all of which interpret shell metacharacters such as ;, |, &&, and backticks. Without input sanitization or use of safe execve-style APIs, command boundaries collapse and attacker input becomes executable code.

Attack Vector

The attack is network-reachable and requires low privileges, according to the CVSS 4.0 vector. An attacker sends a crafted HTTP request to upload_file.cgi with shell metacharacters embedded in the URL query string. The CGI binary reads that string through getenv, builds a command line, and executes it. Successful exploitation grants arbitrary command execution on the camera, enabling firmware tampering, lateral movement into the surveillance network, traffic interception, or use of the device as a botnet node. Public technical analysis of the flaw is hosted on the Notion analysis of the Vivotek vulnerability.

No verified proof-of-concept code is available in NVD-linked sources. Refer to the VulDB entry for VDB-273528 for additional technical context.

Detection Methods for CVE-2024-7443

Indicators of Compromise

• HTTP requests to /upload_file.cgi containing shell metacharacters such as ;, |, &, $(, or backticks in the query string
• Outbound connections from IB8367A cameras to unknown hosts, especially over non-standard ports
• Unexpected processes spawned by the httpd or CGI parent process on the camera, observable through network telemetry
• Modified firmware partitions or new files in writable directories on the device

Detection Strategies

• Inspect web access logs from any reverse proxy or NVR fronting the cameras for suspicious QUERY_STRING content sent to upload_file.cgi
• Deploy network intrusion detection signatures that flag URL-encoded shell metacharacters targeting Vivotek CGI endpoints
• Baseline normal camera traffic and alert on deviations such as new outbound destinations, DNS queries, or large data transfers

Monitoring Recommendations

• Monitor north-south and east-west traffic to and from camera VLANs using network detection tools
• Forward firewall, proxy, and switch logs covering the camera subnet to a centralized analytics platform for query-string and protocol anomaly review
• Track CVE-2024-7443 references against asset inventories so any IB8367A device discovered on the network is flagged as end-of-life

How to Mitigate CVE-2024-7443

Immediate Actions Required

• Identify all Vivotek IB8367A units running firmware VVTK-0100b in the asset inventory and mark them as end-of-life
• Remove the cameras from internet-exposed networks and block inbound access to upload_file.cgi at the perimeter
• Rotate any credentials that were configured on the affected cameras, as low-privilege accounts are sufficient for exploitation
• Plan replacement with a vendor-supported camera model, since no patch will be issued

Patch Information

No patch is available. The vendor has confirmed that the affected IB8367A release tree is end-of-life and will not receive security updates. Organizations must treat continued use of the device as accepted residual risk and prioritize hardware replacement.

Workarounds

• Place IB8367A cameras on an isolated VLAN with no internet egress and strict ACLs allowing only the recording server to reach them
• Front the cameras with a reverse proxy or web application firewall that strips or blocks shell metacharacters in query strings
• Disable remote administrative access and restrict management to a jump host on the segmented network
• Decommission the devices and replace them with vendor-supported models that receive firmware updates

# Example firewall rule to isolate end-of-life Vivotek cameras
# Allow only the NVR (10.10.20.5) to reach the camera subnet (10.10.50.0/24)
iptables -A FORWARD -s 10.10.20.5 -d 10.10.50.0/24 -p tcp --dport 80 -j ACCEPT
iptables -A FORWARD -d 10.10.50.0/24 -j DROP
iptables -A FORWARD -s 10.10.50.0/24 ! -d 10.10.20.5 -j DROP