CVE-2024-52961: Fortinet FortiSandbox RCE Vulnerability

CVE-2024-52961 Overview

CVE-2024-52961 is an OS command injection vulnerability [CWE-78] affecting multiple versions of Fortinet FortiSandbox. The flaw stems from improper neutralization of special elements in operating system commands. An authenticated attacker with at least read-only permissions can send crafted requests to execute unauthorized commands on the underlying system.

Fortinet published the advisory FG-IR-24-306 on March 11, 2025. The vulnerability affects FortiSandbox releases spanning versions 3.0 through 5.0.0, making a broad range of deployments susceptible until patched.

Critical Impact
Authenticated attackers with minimal privileges can execute arbitrary OS commands on FortiSandbox appliances, compromising confidentiality, integrity, and availability of the sandbox analysis platform.

Affected Products

FortiSandbox 5.0.0
FortiSandbox 4.4.0 through 4.4.6, 4.2.1 through 4.2.7, and 4.0.0 through 4.0.5
FortiSandbox 3.2, 3.1, and 3.0 (all versions)

Discovery Timeline

2025-03-11 - CVE-2024-52961 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2024-52961

Vulnerability Analysis

The vulnerability is classified under CWE-78: Improper Neutralization of Special Elements used in an OS Command. FortiSandbox exposes management functions that accept user-supplied input and pass it to an operating system shell without proper sanitization or parameterization.

An attacker authenticated with a read-only account can craft requests containing shell metacharacters such as ;, |, or backticks. When the underlying handler concatenates this input into a command string, the injected commands execute in the context of the FortiSandbox service. This grants command execution on an appliance that is typically trusted to detonate malware, expanding the blast radius of a compromise.

Root Cause

The root cause is missing input validation and sanitization in one or more command-invocation code paths. Instead of executing shell commands with argument arrays or escaping user-controlled tokens, the affected functionality builds command strings by concatenation. Any special character supplied by the caller is passed through to the shell interpreter and evaluated.

Attack Vector

Exploitation requires network access to the FortiSandbox management interface and valid credentials. The read-only privilege requirement is a low authentication barrier. Attackers who have harvested credentials through phishing, credential stuffing, or prior compromise of a low-privilege operator account can pivot to full command execution. The EPSS score is 0.528% (42.3 percentile), reflecting no widespread exploitation observed at time of publication.

No public proof-of-concept exploit code is available. The vulnerability is described in prose in Fortinet Security Advisory FG-IR-24-306.

Detection Methods for CVE-2024-52961

Indicators of Compromise

Unexpected child processes spawned by FortiSandbox service accounts, particularly shells (/bin/sh, /bin/bash) invoked with unusual arguments
Outbound network connections from the FortiSandbox appliance to attacker-controlled infrastructure
Administrative or API requests containing shell metacharacters such as ;, |, &, or backticks in parameter values
Authentication events from read-only accounts followed shortly by configuration changes or command activity

Detection Strategies

Inspect FortiSandbox audit and event logs for API requests containing suspicious characters in fields that normally accept alphanumeric values
Correlate authentication logs from read-only or low-privilege accounts against subsequent administrative or command-invocation activity
Baseline expected process trees on the FortiSandbox appliance and alert on deviations

Monitoring Recommendations

Forward FortiSandbox syslog and API access logs to a central SIEM or data lake for retention and correlation
Monitor management-plane traffic to the FortiSandbox for unusual request patterns or unexpected source IP addresses
Track credential usage on read-only accounts and alert when they access endpoints that typically require higher privileges

How to Mitigate CVE-2024-52961

Immediate Actions Required

Upgrade FortiSandbox to a fixed release as identified in Fortinet Security Advisory FG-IR-24-306
Restrict management interface exposure to trusted administrative networks only
Audit all FortiSandbox accounts and remove or disable unused read-only and operator accounts
Rotate credentials for any account that could reach the management interface

Patch Information

Fortinet has released fixed versions for the affected FortiSandbox branches. Consult Fortinet Security Advisory FG-IR-24-306 for the exact minimum patched versions per branch. Deployments on FortiSandbox 3.0, 3.1, and 3.2 branches should migrate to a supported and patched release, as these older branches may not receive fixes.

Workarounds

Enforce network-level access controls that limit which hosts can reach the FortiSandbox management interface
Apply multi-factor authentication to all FortiSandbox administrative and read-only accounts where supported
Apply least-privilege principles and remove read-only access from accounts that do not require it until patching is complete

bash

# Example: restrict FortiSandbox management access using a network ACL
# Replace TRUSTED_MGMT_SUBNET with the administrative CIDR range
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_MGMT_SUBNET -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP