CVE-2024-35285: Mitel MiCollab RCE Vulnerability

CVE-2024-35285 Overview

A critical command injection vulnerability exists in the NuPoint Messenger (NPM) component of Mitel MiCollab through version 9.8.0.33. This vulnerability allows an unauthenticated attacker to execute arbitrary commands on the underlying system due to insufficient parameter sanitization. The flaw is classified under CWE-77 (Command Injection), indicating that user-supplied input is improperly passed to system command execution functions without adequate validation or sanitization.

Critical Impact

Unauthenticated remote attackers can execute arbitrary system commands on vulnerable Mitel MiCollab deployments, potentially leading to complete system compromise, data exfiltration, and lateral movement within enterprise networks.

Affected Products

• Mitel MiCollab through version 9.8.0.33
• NuPoint Messenger (NPM) component
• All deployments without security patches applied

Discovery Timeline

• October 21, 2024 - CVE-2024-35285 published to NVD
• July 7, 2025 - Last updated in NVD database

Technical Details for CVE-2024-35285

Vulnerability Analysis

The vulnerability resides in the NuPoint Messenger component of Mitel MiCollab, a unified communications platform widely deployed in enterprise environments. The root cause is insufficient parameter sanitization in user-controllable input fields that are subsequently processed by system-level command execution functions.

Command injection vulnerabilities of this nature occur when an application constructs system commands using untrusted data without proper validation. In the context of NuPoint Messenger, an attacker can craft malicious input containing shell metacharacters or command separators that break out of the intended command context and execute arbitrary commands with the privileges of the application process.

The network-accessible nature of this vulnerability, combined with the lack of authentication requirements, makes it particularly dangerous for internet-exposed deployments. Successful exploitation grants attackers the ability to execute commands with the same privileges as the MiCollab service, which may include access to sensitive voicemail data, configuration files, and the ability to pivot to other systems on the network.

Root Cause

The vulnerability stems from improper input validation in the NuPoint Messenger component. User-supplied parameters are passed directly to command execution functions without adequate sanitization, allowing attackers to inject shell metacharacters and arbitrary commands. This represents a failure to implement proper input validation controls and secure coding practices for handling untrusted data in security-sensitive operations.

Attack Vector

The attack is conducted remotely over the network without requiring any authentication. An attacker can target the NuPoint Messenger component by sending specially crafted requests containing malicious command injection payloads. The vulnerability does not require user interaction, making it suitable for automated exploitation.

The attack flow typically involves:

1. Identifying a vulnerable Mitel MiCollab deployment with NuPoint Messenger enabled
2. Crafting a malicious request with command injection payloads in vulnerable parameters
3. Sending the request to the target system
4. Achieving command execution with the privileges of the MiCollab service

Due to the lack of verified proof-of-concept code for this vulnerability, specific exploitation techniques should be referenced from the Mitel Security Advisory 24-0013 for technical details.

Detection Methods for CVE-2024-35285

Indicators of Compromise

• Unusual process spawning from MiCollab or NuPoint Messenger service processes
• Unexpected outbound network connections from the MiCollab server
• Suspicious commands in system logs originating from the web application context
• Unauthorized file modifications or creation in system directories

Detection Strategies

• Monitor HTTP request logs for common command injection patterns including shell metacharacters (;, |, &&, ||, backticks, $())
• Implement web application firewall rules to detect and block command injection attempts
• Deploy network intrusion detection signatures for Mitel MiCollab exploitation attempts
• Enable comprehensive logging on MiCollab servers and forward logs to SIEM for correlation

Monitoring Recommendations

• Configure real-time alerting for process execution anomalies on MiCollab servers
• Monitor for unusual authentication patterns or access to sensitive configuration files
• Implement file integrity monitoring on critical MiCollab system directories
• Review network traffic patterns for data exfiltration indicators

How to Mitigate CVE-2024-35285

Immediate Actions Required

• Apply the security patch referenced in Mitel Security Advisory 24-0013 immediately
• If patching is not immediately possible, restrict network access to NuPoint Messenger to trusted networks only
• Review system logs for indicators of past exploitation attempts
• Implement network segmentation to limit potential lateral movement from compromised systems

Patch Information

Mitel has released security updates to address this vulnerability. Organizations should refer to the Mitel Security Advisory 24-0013 for detailed patching instructions and the latest available software versions. All Mitel MiCollab deployments running version 9.8.0.33 or earlier should be updated to the patched version as soon as possible.

Workarounds

• Implement network-level access controls to restrict access to NuPoint Messenger endpoints to trusted IP addresses only
• Deploy a web application firewall (WAF) with command injection detection rules in front of MiCollab
• Disable NuPoint Messenger functionality if not required for business operations until patching can be completed
• Enable enhanced logging and monitoring to detect exploitation attempts while awaiting patch deployment

# Example: Network-level access restriction using iptables
# Restrict access to MiCollab services to trusted management networks only
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j DROP

# Note: Adjust ports and IP ranges based on your specific deployment
# Consult Mitel documentation for complete list of service ports