CVE-2024-31401
📋 TL;DR
This is a cross-site scripting (XSS) vulnerability in Cybozu Garoon that allows authenticated administrators to inject malicious scripts into web pages. When exploited, these scripts execute in the browsers of other logged-in users, potentially compromising their sessions or stealing sensitive data. Only Garoon installations with administrative users are affected.
💻 Affected Systems
- Cybozu Garoon
📦 What is this software?
Garoon by Cybozu
⚠️ Risk & Real-World Impact
Worst Case
An attacker with administrative privileges could steal session cookies, perform actions as other users, or deploy malware to all users' browsers, leading to complete system compromise and data exfiltration.
Likely Case
Attackers would use this to hijack user sessions, escalate privileges, or steal sensitive information from authenticated users within the Garoon application.
If Mitigated
With proper access controls limiting administrative privileges and input validation, the impact would be limited to isolated session hijacking attempts.
🎯 Exploit Status
Exploitation requires administrative access but is straightforward once that access is obtained.
🛠️ 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. Backup your Garoon installation and database.
2. Download the latest version (5.15.3+) from Cybozu.
3. Follow Cybozu's upgrade documentation to apply the patch.
4. Restart the Garoon service and verify functionality.
🔧 Temporary Workarounds
Restrict Administrative Access
allLimit the number of users with administrative privileges to only essential personnel.
Implement Web Application Firewall (WAF)
allDeploy a WAF with XSS protection rules to block malicious script injection attempts.
🧯 If You Can't Patch
- Isolate the Garoon server from untrusted networks and implement strict network segmentation.
- Monitor administrative user activity closely for suspicious behavior and implement multi-factor authentication for all admin accounts.
🔍 How to Verify
Check if Vulnerable:
Check the Garoon version in the administration panel; if it's between 5.0.0 and 5.15.2, it is vulnerable.Check Version:
Log into Garoon as admin, navigate to System Settings > System Information to view the version.Verify Fix Applied:
After patching, verify the version is 5.15.3 or later and test for XSS by attempting to inject scripts in admin-accessible fields (in a controlled manner).📡 Detection & Monitoring
Log Indicators:
- Unusual administrative user activity, such as frequent login attempts or modifications to user settings.
- Log entries showing script-like content in input fields or error logs related to script execution.
Network Indicators:
- HTTP requests containing suspicious script tags or JavaScript code in parameters, especially from admin accounts.
SIEM Query:
source="garoon_logs" AND (event_type="admin_action" AND action="modify" AND data CONTAINS "<script>")