CVE-2025-52913: Mitel MiCollab Path Traversal Vulnerability

CVE-2025-52913 Overview

A critical path traversal vulnerability has been identified in the NuPoint Unified Messaging (NPM) component of Mitel MiCollab through version 9.8 SP2 (9.8.2.12). This vulnerability allows an unauthenticated attacker to conduct a path traversal attack due to insufficient input validation. A successful exploit could allow unauthorized access, enabling the attacker to view, corrupt, or delete users' data and system configurations.

Critical Impact

Unauthenticated attackers can exploit this path traversal vulnerability to access, modify, or delete sensitive user data and system configurations without any prior authentication, potentially compromising the entire unified messaging infrastructure.

Affected Products

• Mitel MiCollab through version 9.8 SP2 (9.8.2.12)
• Mitel NuPoint Unified Messaging (NPM) component
• All prior versions of Mitel MiCollab with NPM

Discovery Timeline

• 2025-08-08 - CVE CVE-2025-52913 published to NVD
• 2025-08-08 - Last updated in NVD database

Technical Details for CVE-2025-52913

Vulnerability Analysis

This vulnerability (CWE-22: Improper Limitation of a Pathname to a Restricted Directory) exists within the NuPoint Unified Messaging component of Mitel MiCollab. The flaw stems from insufficient input validation when processing user-supplied paths, allowing attackers to escape the intended directory structure.

The path traversal vulnerability enables unauthenticated remote attackers to manipulate file path inputs to access files and directories outside of the restricted scope. By injecting directory traversal sequences such as ../ into request parameters, an attacker can navigate the file system hierarchy and access sensitive resources that should be protected.

The vulnerability affects the confidentiality, integrity, and availability of the system. Attackers can read sensitive configuration files, user data, and potentially overwrite or delete critical system files. This level of access could lead to complete compromise of the unified messaging system.

Root Cause

The root cause of this vulnerability is insufficient input validation within the NuPoint Unified Messaging component. The application fails to properly sanitize user-controlled input before using it in file system operations. Specifically, the component does not adequately filter or normalize path sequences, allowing relative path traversal characters to be processed and used to escape the intended directory boundaries.

Attack Vector

The vulnerability is exploitable over the network without requiring authentication, user interaction, or special privileges. An attacker can craft malicious HTTP requests containing path traversal sequences targeting the NPM component.

The attack follows this general pattern:

1. The attacker identifies an endpoint in the NuPoint Unified Messaging component that accepts file path parameters
2. The attacker crafts a request containing directory traversal sequences (e.g., ../../../etc/passwd)
3. Due to insufficient input validation, the application processes these sequences literally
4. The attacker gains access to files outside the intended directory, potentially including sensitive configuration files, user data, and system files
5. Depending on the specific endpoint, the attacker may also be able to write or delete files, corrupting user data or system configurations

For detailed technical information, refer to the Mitel Security Advisory MISA-2025-0007.

Detection Methods for CVE-2025-52913

Indicators of Compromise

• HTTP requests to NuPoint Unified Messaging endpoints containing path traversal sequences such as ../, ..%2f, %2e%2e/, or similar encoded variants
• Unusual file access patterns in NPM component logs showing attempts to access files outside expected directories
• Access attempts to sensitive system files such as /etc/passwd, /etc/shadow, or configuration files from the NPM service context
• Unexpected modifications or deletions of user voicemail data or system configuration files

Detection Strategies

• Deploy web application firewall (WAF) rules to detect and block path traversal patterns in requests to MiCollab endpoints
• Implement intrusion detection system (IDS) signatures targeting directory traversal attacks against Mitel MiCollab infrastructure
• Enable verbose logging on the MiCollab server and monitor for suspicious file access patterns or error messages indicating path manipulation attempts
• Review application logs for HTTP 500 errors or file-not-found errors that may indicate path traversal probing

Monitoring Recommendations

• Continuously monitor network traffic to MiCollab servers for anomalous request patterns, particularly those containing encoded characters or traversal sequences
• Implement file integrity monitoring (FIM) on critical MiCollab configuration files and user data directories to detect unauthorized access or modifications
• Set up alerting for any unauthenticated access attempts to sensitive endpoints within the NuPoint Unified Messaging component
• Correlate authentication logs with file access logs to identify potential exploitation attempts from unauthenticated sources

How to Mitigate CVE-2025-52913

Immediate Actions Required

• Review the Mitel Security Advisory MISA-2025-0007 for vendor-recommended patches and apply updates immediately
• Restrict network access to MiCollab servers, limiting exposure to trusted networks only until patches are applied
• Implement web application firewall rules to block requests containing path traversal sequences
• Audit MiCollab servers for signs of compromise, including unauthorized file access or modifications

Patch Information

Mitel has released security guidance for this vulnerability. Administrators should consult the official Mitel Security Advisory MISA-2025-0007 for specific patch versions and update instructions. Organizations running Mitel MiCollab version 9.8.2.12 or earlier should prioritize applying the vendor-supplied patches as soon as they become available.

Workarounds

• Place MiCollab servers behind a web application firewall configured to block path traversal attack patterns
• Implement network segmentation to limit access to the NuPoint Unified Messaging component from untrusted networks
• If feasible, disable or restrict access to the vulnerable NPM component until patches can be applied
• Configure reverse proxy rules to sanitize incoming requests and strip path traversal sequences before they reach the MiCollab server

# Example WAF rule pattern to block path traversal attempts
# Add to your WAF configuration to filter requests containing traversal sequences
SecRule REQUEST_URI "@contains ../" "id:1001,phase:1,deny,status:403,msg:'Path Traversal Attempt Blocked'"
SecRule REQUEST_URI "@contains %2e%2e" "id:1002,phase:1,deny,status:403,msg:'Encoded Path Traversal Blocked'"
SecRule REQUEST_URI "@contains ..%2f" "id:1003,phase:1,deny,status:403,msg:'Mixed Encoding Path Traversal Blocked'"