CVE-2024-55550: Mitel MiCollab Information Disclosure Flaw

CVE-2024-55550 Overview

CVE-2024-55550 is a local file read vulnerability affecting Mitel MiCollab through version 9.8 SP2. The vulnerability exists due to insufficient input sanitization, which allows an authenticated attacker with administrative privileges to read local files on the affected system. While the impact is limited to non-sensitive system information and does not permit file modification or privilege escalation, this vulnerability has been added to CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild.

Critical Impact

Despite its low CVSS score, this vulnerability is actively being exploited in the wild and has been added to CISA's Known Exploited Vulnerabilities catalog, requiring immediate attention from organizations using Mitel MiCollab.

Affected Products

• Mitel MiCollab through 9.8 SP2
• All Mitel MiCollab versions prior to the security patch

Discovery Timeline

• 2024-12-10 - CVE-2024-55550 published to NVD
• 2025-11-04 - Last updated in NVD database

Technical Details for CVE-2024-55550

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Path Traversal), a weakness that occurs when user-controlled input is used to construct file paths without proper validation or sanitization. In the case of CVE-2024-55550, the Mitel MiCollab application fails to adequately sanitize input parameters that are used to access files on the local system.

The vulnerability requires authentication with administrative privileges, which limits the attack surface but does not eliminate the risk, particularly in scenarios involving compromised admin credentials or insider threats. Although the disclosed information is limited to non-sensitive system data, path traversal vulnerabilities can often be chained with other exploits to achieve more significant impacts.

Root Cause

The root cause of CVE-2024-55550 lies in insufficient input sanitization within the Mitel MiCollab application. When processing file path requests from authenticated administrators, the application fails to properly validate and sanitize the input, allowing directory traversal sequences (such as ../) to escape intended directory boundaries and access files elsewhere on the system.

Attack Vector

The attack vector for this vulnerability is network-based, requiring an attacker to have valid administrative credentials to the Mitel MiCollab system. Once authenticated, the attacker can craft malicious requests containing path traversal sequences to read arbitrary local files. The attack does not require user interaction and can be executed with low complexity.

An attacker would typically craft HTTP requests with manipulated file path parameters containing directory traversal sequences to access files outside the intended directory structure. The vulnerability allows reading of system files, though the exposure is limited to non-sensitive system information according to the vendor advisory.

Detection Methods for CVE-2024-55550

Indicators of Compromise

• Unusual file access patterns from the MiCollab application, particularly requests containing path traversal sequences like ../ or encoded variants
• Administrative session activity accessing unexpected system directories or files
• Anomalous HTTP request logs showing directory traversal attempts in file path parameters
• Authentication logs showing suspicious administrative login activity from unusual IP addresses or at unusual times

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns in HTTP requests
• Monitor MiCollab application logs for file access attempts outside normal operational directories
• Deploy file integrity monitoring (FIM) on critical system files to detect unauthorized access
• Configure SIEM correlation rules to alert on path traversal attack patterns targeting MiCollab endpoints

Monitoring Recommendations

• Enable detailed logging for all administrative actions within Mitel MiCollab
• Configure alerting for any file access attempts containing directory traversal patterns
• Monitor network traffic to MiCollab systems for anomalous request patterns
• Review administrative access logs regularly for signs of credential compromise or misuse

How to Mitigate CVE-2024-55550

Immediate Actions Required

• Review and apply the latest security patches from Mitel as referenced in Mitel Security Advisory MISA-2024-0029
• Audit all administrative accounts for compromise and enforce strong authentication including multi-factor authentication (MFA)
• Restrict network access to MiCollab administrative interfaces to trusted IP ranges only
• Enable comprehensive logging and monitoring for all administrative actions

Patch Information

Mitel has released security information addressing this vulnerability. Organizations should consult the Mitel Security Advisories page and specifically Mitel Security Advisory MISA-2024-0029 for detailed patch information and upgrade instructions. Given that this vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, applying patches should be prioritized.

Workarounds

• Implement network segmentation to isolate MiCollab administrative interfaces from untrusted networks
• Deploy a web application firewall (WAF) configured to block path traversal attack patterns
• Enforce strict access controls and limit administrative privileges to essential personnel only
• Monitor administrative sessions for suspicious file access activity until patches can be applied

# Example WAF rule to block path traversal patterns
# Add to your web application firewall configuration
# Block requests containing directory traversal sequences
SecRule REQUEST_URI|ARGS|REQUEST_BODY "@rx (\.\./|\.\.\\)" \
    "id:1001,phase:2,deny,status:403,log,msg:'Path Traversal Attempt Detected'"