CVE-2024-54018: Fortinet FortiSandbox RCE Vulnerability

CVE-2024-54018 Overview

CVE-2024-54018 is an OS command injection vulnerability [CWE-78] affecting Fortinet FortiSandbox versions before 4.4.5. The flaw stems from improper neutralization of special elements passed to operating system commands. A privileged attacker can send crafted requests to execute unauthorized commands on the underlying host.

Fortinet disclosed the issue in security advisory FG-IR-24-110. The vulnerability affects the sandbox appliance responsible for detonating and analyzing suspicious files, making it a sensitive component within enterprise threat detection pipelines.

Critical Impact
An authenticated attacker with high privileges can execute arbitrary OS commands on FortiSandbox appliances, compromising the confidentiality, integrity, and availability of the malware analysis platform.

Affected Products

Fortinet FortiSandbox versions prior to 4.4.5
FortiSandbox appliance deployments running vulnerable firmware
FortiSandbox virtual machine editions on affected release branches

Discovery Timeline

2025-03-11 - CVE-2024-54018 published to the National Vulnerability Database
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-54018

Vulnerability Analysis

The vulnerability is classified under CWE-78, improper neutralization of special elements used in an OS command. FortiSandbox processes attacker-controlled input from crafted requests without sufficient sanitization before passing values into shell command execution paths.

Multiple injection points exist within the affected firmware. Each allows a privileged user session to append or substitute shell metacharacters into command strings executed by the appliance. The result is direct command execution in the context of the underlying operating system.

Exploitation requires an authenticated session with high privileges, which limits opportunistic abuse. However, compromised administrator credentials, session hijacking, or insider threats convert this into a full appliance takeover.

Root Cause

The root cause is missing or insufficient input validation on parameters that flow into OS command invocations. Shell metacharacters such as ;, |, `, and $() are not neutralized before the appliance concatenates the input into a command string. Fortinet's advisory FG-IR-24-110 confirms multiple affected code paths.

Attack Vector

The attack vector is network-based over the FortiSandbox management interface. An attacker authenticates with an existing privileged account, then submits crafted requests containing shell metacharacters embedded in parameter values.

The injected commands execute with the privileges of the sandbox service. Because FortiSandbox handles malware samples and integrates with FortiGate, FortiMail, and FortiWeb, a compromised appliance can be pivoted to disrupt detonation results or extract analyzed samples.

No public proof-of-concept exploit is available at the time of publication, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2024-54018

Indicators of Compromise

Unexpected child processes spawned by FortiSandbox service accounts, especially shells such as sh, bash, or interpreters like python and perl
Administrative API or web console requests containing shell metacharacters (;, &&, |, backticks, $()) in parameter values
Outbound network connections from the FortiSandbox management interface to unrecognized external hosts
New or modified files under system directories that do not correspond to Fortinet-signed updates

Detection Strategies

Inspect FortiSandbox audit logs for administrative actions originating from unusual source IPs or occurring outside change windows
Correlate authentication events with subsequent configuration or diagnostic API calls that include unusual payload structure
Baseline normal command execution on the appliance and alert on deviations captured by syslog forwarding

Monitoring Recommendations

Forward FortiSandbox syslog and audit events to a centralized SIEM or data lake for retention and correlation
Monitor privileged account usage on FortiSandbox and enforce multi-factor authentication for administrative access
Alert on any configuration export, firmware change, or script upload activity performed by administrator accounts

How to Mitigate CVE-2024-54018

Immediate Actions Required

Upgrade FortiSandbox to version 4.4.5 or later as specified in Fortinet advisory FG-IR-24-110
Restrict administrative access to the FortiSandbox management interface using network ACLs and management VLAN segmentation
Rotate credentials for all privileged FortiSandbox accounts and audit recent administrative activity for signs of misuse
Enable and enforce multi-factor authentication for all administrator logins on the appliance

Patch Information

Fortinet released fixed firmware in FortiSandbox 4.4.5. Administrators should consult the Fortinet Security Advisory FG-IR-24-110 for the complete list of fixed builds and upgrade paths for earlier branches. Apply the upgrade during a scheduled maintenance window and validate sandbox detonation workflows after patching.

Workarounds

Limit trusted administrative source networks to a small allow-list of jump hosts until patching is complete
Reduce the number of accounts with high-privilege roles on FortiSandbox and apply the principle of least privilege
Disable unused administrative interfaces and API endpoints where operationally feasible

bash

# Example: restrict FortiSandbox management access to a trusted subnet
config system interface
  edit port1
    set allowaccess https ssh
    set trusthost1 10.10.20.0 255.255.255.0
  next
end