CVE-2024-27172: Remote Command Program RCE Vulnerability

CVE-2024-27172 Overview

CVE-2024-27172 is a critical Command Injection vulnerability affecting Toshiba Tec products that allows remote attackers to achieve Remote Code Execution (RCE). The vulnerability exists in the Remote Command program component, which fails to properly sanitize user-supplied input before passing it to system commands. This allows unauthenticated attackers with network access to execute arbitrary commands on affected devices with the privileges of the vulnerable application.

Critical Impact

This vulnerability enables unauthenticated remote attackers to fully compromise affected Toshiba Tec devices, potentially leading to complete system takeover, data exfiltration, lateral movement within networks, and use of compromised devices as pivot points for further attacks.

Affected Products

• Toshiba Tec Multi-Function Printers (MFPs)
• Toshiba Tec devices running vulnerable firmware versions
• See Toshiba Tec Security Notice for complete affected product list

Discovery Timeline

• June 14, 2024 - CVE-2024-27172 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2024-27172

Vulnerability Analysis

This vulnerability is classified as CWE-78 (Improper Neutralization of Special Elements used in an OS Command), commonly known as OS Command Injection. The Remote Command program component in affected Toshiba Tec devices fails to adequately validate and sanitize user-controlled input before incorporating it into operating system commands.

When exploited, attackers can inject malicious shell commands that are executed by the underlying operating system. The vulnerability is particularly severe because it requires no authentication and can be exploited remotely over the network. The impact encompasses complete compromise of confidentiality, integrity, and availability of the affected system.

The high EPSS score indicates significant likelihood of exploitation in the wild, placing this vulnerability among the most likely to be targeted by attackers. Organizations using affected Toshiba Tec devices should prioritize remediation immediately.

Root Cause

The root cause of CVE-2024-27172 lies in insufficient input validation within the Remote Command program. The application constructs operating system commands using user-supplied data without proper sanitization or escaping of shell metacharacters. This allows attackers to break out of the intended command context and inject arbitrary commands.

Common shell metacharacters such as semicolons (;), pipes (|), backticks (`), and command substitution sequences ($(...)) can be leveraged to append or inject additional commands that execute with the same privileges as the vulnerable process.

Attack Vector

The attack vector is network-based, allowing remote exploitation without requiring any user interaction or prior authentication. An attacker can craft malicious requests to the Remote Command program interface, embedding shell commands within parameters that are processed by the vulnerable component.

The exploitation flow typically involves:

1. Identifying an exposed Toshiba Tec device on the network
2. Sending a crafted request to the Remote Command program endpoint
3. Including shell metacharacters and malicious commands in the request parameters
4. The vulnerable application executes the injected commands on the underlying system

For technical details on the exploitation mechanism, refer to the Full Disclosure Mailing List Post and the JVN Vulnerability Report.

Detection Methods for CVE-2024-27172

Indicators of Compromise

• Unusual outbound network connections from Toshiba Tec MFP devices
• Unexpected processes spawned by the web service or Remote Command program
• Command execution artifacts in device logs containing shell metacharacters
• Anomalous file system changes or creation of unauthorized files on the device

Detection Strategies

• Monitor network traffic to and from Toshiba Tec devices for suspicious patterns or unexpected external connections
• Implement IDS/IPS rules to detect command injection patterns in HTTP requests targeting MFP management interfaces
• Enable comprehensive logging on affected devices and forward logs to a SIEM for analysis
• Scan for exposed Toshiba Tec device management interfaces from external networks

Monitoring Recommendations

• Configure alerting for any new outbound connections from printer/MFP network segments
• Establish baseline behavior for Toshiba Tec devices and alert on deviations
• Monitor for reconnaissance activities targeting common MFP ports and services
• Review device logs regularly for authentication failures or unusual access patterns

How to Mitigate CVE-2024-27172

Immediate Actions Required

• Apply firmware updates from Toshiba Tec immediately as documented in the Toshiba Tec Security Notice
• Restrict network access to affected devices using firewall rules and network segmentation
• Disable or restrict access to the Remote Command program functionality if not required
• Ensure affected devices are not directly exposed to the internet or untrusted networks

Patch Information

Toshiba Tec has released security updates to address this vulnerability. Organizations should review the official security advisory and apply the recommended firmware updates. Detailed patch information and affected product versions are available in the Toshiba Tec PDF Information Release.

It is critical to verify the firmware version after patching to ensure the update was successfully applied. Organizations should establish a regular patching cadence for embedded devices and MFPs, which are often overlooked in vulnerability management programs.

Workarounds

• Isolate affected Toshiba Tec devices on a dedicated network segment with strict access controls
• Block external network access to MFP management interfaces using perimeter firewalls
• Disable the Remote Command program functionality through device configuration if business operations permit
• Implement application-layer filtering to block requests containing shell metacharacters targeting device interfaces

# Example firewall rule to restrict access to MFP management interfaces
# Adjust IP ranges and ports according to your environment
iptables -A INPUT -p tcp --dport 443 -s 192.168.10.0/24 -d 192.168.20.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -d 192.168.20.0/24 -j DROP
# Note: Replace 192.168.20.0/24 with your MFP network segment
# Replace 192.168.10.0/24 with authorized management network