CVE-2024-33535
📋 TL;DR
This vulnerability allows unauthenticated attackers to read arbitrary files from a specific directory in Zimbra Collaboration Suite. It affects Zimbra Collaboration (ZCS) versions 9.0 and 10.0 through local file inclusion in web application handling of the packages parameter. Attackers can exploit this without authentication to access sensitive information.
💻 Affected Systems
- Zimbra Collaboration Suite (ZCS)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of sensitive configuration files, credentials, or system information leading to further attacks or data exfiltration.
Likely Case
Unauthorized reading of configuration files, logs, or other sensitive data within the vulnerable directory.
If Mitigated
Limited impact due to directory restrictions, but still potential information disclosure.
🎯 Exploit Status
Unauthenticated exploitation with simple parameter manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 10.0.8 and 9.0.0 Patch 40
Vendor Advisory: https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.8#Security_Fixes
Restart Required: Yes
Instructions:
1. Backup Zimbra installation and data. 2. Apply Zimbra patch 10.0.8 or 9.0.0 P40. 3. Restart Zimbra services. 4. Verify patch application.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allBlock malicious requests targeting the packages parameter
Network Segmentation
allRestrict access to Zimbra web interface to trusted networks only
🧯 If You Can't Patch
- Implement strict network access controls to limit exposure
- Monitor logs for suspicious file inclusion attempts
🔍 How to Verify
Check if Vulnerable:
Check Zimbra version and compare with vulnerable versions (9.0 or 10.0 before patches)Check Version:
zmcontrol -vVerify Fix Applied:
Verify Zimbra version is 10.0.8 or 9.0.0 P40 or later📡 Detection & Monitoring
Log Indicators:
- Unusual requests to web endpoints with packages parameter
- Failed file inclusion attempts in web logs
Network Indicators:
- HTTP requests with suspicious packages parameter values
- Unusual file path patterns in web requests
SIEM Query:
web_access_logs WHERE uri CONTAINS 'packages=' AND (uri CONTAINS '../' OR uri CONTAINS '..\\')