CVE-2024-31404
📋 TL;DR
This vulnerability in Cybozu Garoon allows authenticated users to view sensitive Scheduler data they shouldn't have access to. It affects users who can log into Garoon versions 5.5.0 through 6.0.0. The issue involves improper handling of sensitive information in sent data.
💻 Affected Systems
- Cybozu Garoon
📦 What is this software?
Garoon by Cybozu
⚠️ Risk & Real-World Impact
Worst Case
An authenticated malicious insider could access confidential scheduling information, meeting details, and potentially sensitive organizational data stored in the Scheduler module.
Likely Case
Accidental or intentional data exposure where users see scheduling information they shouldn't have permission to view, potentially violating privacy policies.
If Mitigated
Limited exposure of non-critical scheduling data with proper access controls and monitoring in place.
🎯 Exploit Status
Exploitation requires valid user credentials and access to the affected Garoon instance.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.0.0 with specific security updates or later versions
Vendor Advisory: https://cs.cybozu.co.jp/2024/007901.html
Restart Required: Yes
Instructions:
1. Backup your Garoon installation and database. 2. Download the latest security update from Cybozu support portal. 3. Apply the patch following Cybozu's update procedures. 4. Restart the Garoon service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict Scheduler Access
allTemporarily limit access to Scheduler module to only essential users
Configure via Garoon administration interface: Access Control > Module Permissions > Scheduler
Enhanced Monitoring
allIncrease logging and monitoring of Scheduler access patterns
Enable detailed audit logging in Garoon administration interface
🧯 If You Can't Patch
- Implement strict access controls to limit which users can access the Scheduler module
- Deploy network segmentation to isolate Garoon instances and monitor for unusual access patterns
🔍 How to Verify
Check if Vulnerable:
Check Garoon version in administration interface: System > System Information > VersionCheck Version:
Check via Garoon web interface or consult system administrator for version detailsVerify Fix Applied:
Verify version is 6.0.0 with security updates applied or later, and test that authenticated users cannot access unauthorized Scheduler data📡 Detection & Monitoring
Log Indicators:
- Unusual Scheduler access patterns
- Multiple failed access attempts to Scheduler by same user
- Access to Scheduler data outside normal business hours
Network Indicators:
- Increased traffic to Scheduler API endpoints
- Unusual request patterns to scheduler-related URLs
SIEM Query:
source="garoon" AND (event_type="scheduler_access" OR uri_path="/schedule/*") AND user NOT IN [authorized_users]