CVE-2024-7897: Tosei Online Store Management RCE Flaw

CVE-2024-7897 Overview

CVE-2024-7897 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/tosei_kikai.php script, where the kikaibangou parameter is passed to a shell context without adequate sanitization. Remote attackers with low-level privileges can inject operating system commands through this parameter. The exploit details have been publicly disclosed, increasing exposure risk for unpatched deployments. The vendor was contacted about the issue but did not respond, and no official patch is currently available.

Critical Impact
Remote attackers can inject arbitrary operating system commands through the kikaibangou parameter, resulting in unauthorized command execution on affected Tosei systems.

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-2024-7897 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-7897

Vulnerability Analysis

The vulnerability is a command injection flaw [CWE-77] in the tosei_kikai.php CGI script shipped with the Tosei Online Store Management System. The kikaibangou request argument is embedded into a system command execution path without proper input validation or escaping. An authenticated remote attacker can supply shell metacharacters through this parameter to execute arbitrary commands on the underlying host. The EPSS probability of 2.595% places this issue in the 84th percentile for likelihood of exploitation, reflecting public disclosure of exploit details.

Root Cause

The root cause is improper neutralization of special elements used in an OS command. The affected PHP script accepts the kikaibangou parameter from HTTP requests and concatenates it into a shell invocation. Because no allowlist, escaping, or parameterization is applied, characters such as ;, |, &, and backticks pass through directly to the underlying command interpreter. The result is arbitrary command execution under the privileges of the web server process.

Attack Vector

Exploitation is performed over the network against the vulnerable CGI endpoint. An attacker sends a crafted HTTP request to /cgi-bin/tosei_kikai.php with a malicious kikaibangou value containing shell metacharacters and a payload command. The web server passes the tainted value into a shell context, which executes the injected command. The attack requires low privileges but no user interaction. A public proof of concept is available in a GitHub Gist PoC and referenced in VulDB #274905.

Detection Methods for CVE-2024-7897

Indicators of Compromise

HTTP requests to /cgi-bin/tosei_kikai.php containing shell metacharacters (;, |, &, backticks, $()) in the kikaibangou parameter.
Web server processes spawning unexpected child processes such as sh, bash, wget, curl, nc, or perl.
Outbound network connections initiated by the web server user to unrecognized external hosts shortly after HTTP requests targeting the CGI script.

Detection Strategies

Deploy web application firewall rules that inspect the kikaibangou parameter for command separators and shell metacharacters.
Correlate access logs for /cgi-bin/tosei_kikai.php with process creation events on the host to identify anomalous command execution chains.
Alert on non-standard user-agents or high request rates targeting the vulnerable CGI endpoint.

Monitoring Recommendations

Enable verbose logging on the CGI handler and forward logs to a centralized SIEM for retention and analysis.
Monitor file system changes in web-accessible directories and system binaries for signs of post-exploitation persistence.
Track outbound egress from segments hosting the Tosei application and flag connections to non-approved destinations.

How to Mitigate CVE-2024-7897

Immediate Actions Required

Restrict network access to the Tosei Online Store Management System interface to trusted management networks or VPN users only.
Place the application behind a reverse proxy or web application firewall configured to block shell metacharacters in the kikaibangou parameter.
Review web server and CGI logs for prior exploitation attempts against /cgi-bin/tosei_kikai.php.

Patch Information

No official vendor patch is available at this time. According to the disclosure notes referenced in VulDB CTI #274905, the vendor was contacted about the vulnerability but did not respond. Organizations running affected versions should apply compensating controls until an official fix is released.

Workarounds

Disable or remove the tosei_kikai.php CGI script if the associated functionality is not required in your deployment.
Enforce authentication and IP allowlisting at the reverse proxy layer to limit who can reach the vulnerable endpoint.
Run the web server under a least-privilege account and use OS-level controls such as SELinux or AppArmor to constrain command execution.

bash

# Example WAF rule concept: block shell metacharacters in the kikaibangou parameter
# ModSecurity-style pseudo-rule
SecRule ARGS:kikaibangou "@rx [;&|`$()<>\\]" \
    "id:1007897,phase:2,deny,status:403,\
    msg:'CVE-2024-7897 Tosei command injection attempt'"