CVE-2024-31397
📋 TL;DR
An improper handling of extra values vulnerability in Cybozu Garoon allows authenticated administrators to cause a denial-of-service condition. This affects users with administrative privileges on vulnerable Garoon installations. The vulnerability could disrupt service availability for all users of the affected system.
💻 Affected Systems
- Cybozu Garoon
📦 What is this software?
Garoon by Cybozu
⚠️ Risk & Real-World Impact
Worst Case
Complete service unavailability for all Garoon users, requiring system restart or recovery procedures.
Likely Case
Temporary service disruption affecting business operations until the system recovers or is restarted.
If Mitigated
Limited impact if administrative access is tightly controlled and monitored.
🎯 Exploit Status
Exploitation requires administrative credentials. The vulnerability involves improper handling of input values that can trigger DoS conditions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.15.3 or later
Vendor Advisory: https://cs.cybozu.co.jp/2024/007901.html
Restart Required: Yes
Instructions:
1. Download Garoon 5.15.3 or later from Cybozu support portal. 2. Backup current installation and database. 3. Apply the update following Cybozu's upgrade procedures. 4. Restart the Garoon service. 5. Verify functionality post-update.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit administrative privileges to only essential personnel and implement multi-factor authentication.
Network Segmentation
allIsolate Garoon servers from general network access and implement strict firewall rules.
🧯 If You Can't Patch
- Implement strict access controls and monitoring for administrative accounts
- Deploy network-based intrusion detection/prevention systems to monitor for DoS patterns
🔍 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, the system is vulnerable.Check Version:
Check via Garoon web interface: Administration > System Information > VersionVerify Fix Applied:
Verify Garoon version is 5.15.3 or later in Administration > System Information after applying the update.📡 Detection & Monitoring
Log Indicators:
- Unusual administrative activity patterns
- Service interruption logs
- Error logs related to input processing
Network Indicators:
- Unusual traffic patterns to administrative endpoints
- Service unavailability alerts
SIEM Query:
source="garoon_logs" AND (event_type="admin_action" OR event_type="service_error") | stats count by user, endpoint