CVE-2024-7896 Overview
CVE-2024-7896 is a command injection vulnerability in the Tosei Online Store Management System (ネット店舗管理システム) versions 4.02, 4.03, and 4.04. The flaw resides in the /cgi-bin/p1_ftpserver.php script, where the adr_txt parameter is passed to a system command without proper sanitization. Remote attackers with low-privileged access can inject arbitrary operating system commands. The exploit has been publicly disclosed via a GitHub Gist, increasing the risk of opportunistic attacks. The vendor was contacted before public disclosure but did not respond, and no official patch is currently available.
Critical Impact
Authenticated remote attackers can execute arbitrary operating system commands on affected Tosei Online Store Management System deployments by manipulating the adr_txt parameter.
Affected Products
- Tosei Online Store Management System 4.02
- Tosei Online Store Management System 4.03
- Tosei Online Store Management System 4.04
Discovery Timeline
- 2024-08-17 - CVE-2024-7896 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2024-7896
Vulnerability Analysis
The vulnerability is a classic command injection flaw [CWE-77] in the FTP server configuration component of the Tosei Online Store Management System. The affected script, /cgi-bin/p1_ftpserver.php, accepts user-controlled input through the adr_txt parameter and incorporates it into a shell command without sufficient input validation or output encoding. When shell metacharacters such as ;, |, &, or backticks are supplied, the underlying command interpreter treats the injected content as additional commands.
Exploitation requires network access to the management interface and low-level authentication. Successful attacks yield command execution in the context of the web server user, providing a foothold for lateral movement, data theft, or persistence. The public proof-of-concept published on GitHub Gist demonstrates the exploitation path in detail.
Root Cause
The root cause is the direct concatenation of the adr_txt HTTP parameter into a system shell invocation within p1_ftpserver.php. The application does not enforce an allowlist of permitted characters, escape shell metacharacters, or use parameterized process execution APIs. This design pattern permits an attacker to break out of the intended argument context and append arbitrary commands.
Attack Vector
The attack is delivered over the network. An authenticated user sends a crafted HTTP request to /cgi-bin/p1_ftpserver.php containing shell metacharacters in the adr_txt field. The web server executes the constructed command line, invoking the attacker's payload. Because the affected component is a management interface, exposure of the endpoint to untrusted networks materially increases risk. Refer to the published GitHub Gist PoC and VulDB entry #274904 for technical exploitation details.
Detection Methods for CVE-2024-7896
Indicators of Compromise
- HTTP POST or GET requests to /cgi-bin/p1_ftpserver.php containing shell metacharacters (;, |, &, `, $() in the adr_txt parameter.
- Web server process spawning unexpected child processes such as /bin/sh, wget, curl, nc, or python.
- Outbound network connections from the Tosei management host to unfamiliar IP addresses shortly after requests to the FTP configuration endpoint.
- New or modified files in web-writable directories that were not part of a legitimate administrator action.
Detection Strategies
- Deploy web application firewall rules that flag or block shell metacharacters in POST bodies targeting /cgi-bin/p1_ftpserver.php.
- Correlate web access logs with process execution telemetry to identify web server processes spawning shell interpreters.
- Baseline expected command execution from the PHP-CGI process tree and alert on deviations.
Monitoring Recommendations
- Enable verbose access logging on the CGI endpoint and forward logs to a centralized analytics platform for retention and search.
- Monitor for anomalous authentication events preceding requests to p1_ftpserver.php, since exploitation requires low-privileged credentials.
- Alert on egress traffic from the management host to unclassified external destinations.
How to Mitigate CVE-2024-7896
Immediate Actions Required
- Restrict network access to the Tosei Online Store Management System interface using firewall rules or a VPN, limiting reachability to trusted administrators.
- Rotate credentials for any accounts that can access /cgi-bin/p1_ftpserver.php, since exploitation requires authentication.
- Review web server and system logs for prior requests to p1_ftpserver.php containing suspicious characters in the adr_txt parameter.
- Isolate affected systems from sensitive network segments until compensating controls are in place.
Patch Information
No vendor patch is available at the time of publication. The vendor did not respond to disclosure attempts documented in the VulDB submission. Administrators should track the vendor's channels for future security advisories and consider decommissioning the affected versions if a fix is not released.
Workarounds
- Block external access to /cgi-bin/p1_ftpserver.php at the reverse proxy or web server configuration layer until a vendor fix is released.
- Apply web application firewall signatures that reject requests containing shell metacharacters in the adr_txt parameter.
- Enforce least-privilege execution for the PHP-CGI process to limit the blast radius of any successful command injection.
- Enable multi-factor authentication for the management interface where supported to raise the bar for exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
