CVE-2024-31402
📋 TL;DR
An incorrect authorization vulnerability in Cybozu Garoon allows authenticated users to delete Shared To-Do data they shouldn't have access to. This affects organizations using Garoon versions 5.0.0 through 5.15.2 for collaboration and task management. The vulnerability enables privilege escalation within the application's authorization framework.
💻 Affected Systems
- Cybozu Garoon
📦 What is this software?
Garoon by Cybozu
⚠️ Risk & Real-World Impact
Worst Case
Malicious insider or compromised account could systematically delete all shared task data, disrupting business operations and causing data loss.
Likely Case
Accidental or intentional deletion of shared task lists by users with limited permissions, creating confusion and workflow disruption.
If Mitigated
Minimal impact with proper access controls, audit logging, and regular backups in place.
🎯 Exploit Status
Exploitation requires authenticated access but the authorization bypass is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.15.3
Vendor Advisory: https://cs.cybozu.co.jp/2024/007901.html
Restart Required: Yes
Instructions:
1. Backup Garoon data and configuration. 2. Download Garoon 5.15.3 or later from Cybozu. 3. Follow Cybozu's upgrade documentation. 4. Restart Garoon services. 5. Verify functionality post-upgrade.
🔧 Temporary Workarounds
Restrict Shared To-Do Access
allTemporarily limit access to Shared To-Do functionality to only essential users.
Enhanced Monitoring
allIncrease logging and monitoring of Shared To-Do deletion events.
🧯 If You Can't Patch
- Implement strict access controls and principle of least privilege for Garoon users
- Enable comprehensive audit logging for all Shared To-Do operations and review regularly
🔍 How to Verify
Check if Vulnerable:
Check Garoon version in Administration > System Information. If version is between 5.0.0 and 5.15.2 inclusive, system is vulnerable.Check Version:
Check via Garoon web interface: Administration > System Information > VersionVerify Fix Applied:
After patching, verify version shows 5.15.3 or higher in Administration > System Information.📡 Detection & Monitoring
Log Indicators:
- Unusual patterns of Shared To-Do deletions
- Deletion events from non-administrative users
- Multiple deletion requests in short timeframes
Network Indicators:
- HTTP POST requests to Shared To-Do deletion endpoints from unauthorized users
SIEM Query:
source="garoon_logs" action="delete" object_type="shared_todo" user_role!="admin"