Mitel MiCollab Directory Traversal Local File Read Vulnerability Advisory (CVE-2024-55550)
Executive & SecOps Summary
SECOPS ASSESSMENTMitel MiCollab through 9.8 SP2
An authenticated attacker with administrative privileges can exploit insufficient input sanitization to read arbitrary non-sensitive local system files
Apply the official security patches or upgrade to the latest supported version immediately
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
Refer to the Mitel Product Security Advisory MISA-2024-0029 to obtain and apply the official security updates. Use the system update utility to apply the latest patches:
# Check for available updates and apply the security patches
ms-update --check
ms-update --install2. Temporary Workaround & Hardening Configuration
If immediate patching is not feasible, restrict access to the MiCollab administrative interface to trusted IP addresses only using firewall rules or reverse proxy configurations:
# Restricting access to the admin console in Nginx configuration
location /admin/ {
allow 10.0.0.0/8; # Internal management network
deny all;
}3. Log Audit & IoC Verification Commands
Scan the web server access logs for directory traversal patterns to identify potential exploitation attempts:
# Search for directory traversal sequences in web access logs
grep -Ei '(\.\./|\.\.%2f|%2e%2e/|%2e%2e%2f)' /var/log/httpd/access_log /var/log/nginx/access.log 2>/dev/nullStop Exposing VPN Ports to the Internet — Switch to Zero-Trust Access
Eliminate public-facing VPN concentrators and firewall management ports with identity-first Zero-Trust Network Access.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2024-55550) is a directory traversal (CWE-22) leading to local file read in Mitel MiCollab. The root cause lies in insufficient input sanitization of user-supplied file paths within the administrative interface. This allows an authenticated administrative user to bypass intended directory restrictions and access files on the local filesystem.
2. Exploitation Mechanics & Attack Scenario
An attacker must first obtain authenticated administrative access to the MiCollab system. By crafting malicious HTTP requests containing directory traversal sequences (such as '../' or URL-encoded equivalents) in parameters handling file paths, the attacker can force the application to retrieve and display files outside the designated web root. However, this vulnerability does not allow file modification or privilege escalation, and the disclosure is limited to non-sensitive system information.
3. Infrastructure & Business Impact
Although assigned a CVSS score of 2.7 (LOW) due to the requirement of administrative privileges and limited information disclosure, this vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, indicating active exploitation in the wild. Attackers can leverage this vulnerability during the reconnaissance phase to map internal system structures and facilitate subsequent multi-stage attacks.
Official Vendor Advisories & References
Mitel MiCollab through 9.8 SP2 could allow an authenticated attacker with administrative privilege to conduct a local file read, due to insufficient input sanitization. A successful exploit could allow the authenticated admin attacker to access resources that are constrained to the admin access level, and the disclosure is limited to non-sensitive system information. This vulnerability does not allow file modification or privilege escalation.
Frequently Asked SecOps Questions (CVE-2024-55550)
FAQQ1. How critical is CVE-2024-55550 and is it actively exploited in the wild?
CVE-2024-55550 is rated CVSS 2.7 (LOW) with a 30-day EPSS exploitation probability of 38.2%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2024-55550?
Primary impacted vendors include mitel across micollab. Scope summary: Mitel MiCollab versions through 9.8 SP2
Q3. What temporary mitigations or workarounds exist for CVE-2024-55550 before patching?
[Mitigation] Apply the official security patches or upgrade to the latest supported version immediately Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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