CVE-2023-33558
📋 TL;DR
This vulnerability in Ocomon's users-grid-data.php component allows attackers to access sensitive user information including emails and usernames without proper authentication. It affects Ocomon installations before version 4.0.1, potentially exposing user data to unauthorized parties.
💻 Affected Systems
- Ocomon
📦 What is this software?
Ocomon by Ocomon Project
⚠️ Risk & Real-World Impact
Worst Case
Attackers could harvest all user emails and usernames, enabling targeted phishing campaigns, credential stuffing attacks, or identity theft against the organization's user base.
Likely Case
Attackers will collect user email addresses and usernames for spam lists, credential stuffing databases, or reconnaissance for further attacks.
If Mitigated
With proper network segmentation and access controls, only authorized internal users could access the data, limiting exposure.
🎯 Exploit Status
The vulnerability appears to be a direct information disclosure via improper access controls in the PHP component.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.1
Vendor Advisory: https://github.com/ninj4c0d3r/OcoMon-Research/commit/6357def478b11119270b89329fceb115f12c69fc
Restart Required: No
Instructions:
1. Download Ocomon v4.0.1 or later from official sources. 2. Backup current installation. 3. Replace users-grid-data.php with patched version. 4. Verify functionality.
🔧 Temporary Workarounds
Access Restriction
allRestrict access to users-grid-data.php via web server configuration or firewall rules.
# Apache: <Location /path/to/users-grid-data.php> Require all denied </Location>
# Nginx: location ~ /users-grid-data\.php$ { deny all; }
🧯 If You Can't Patch
- Implement strict network access controls to limit who can reach the Ocomon instance.
- Monitor access logs for unauthorized requests to users-grid-data.php.
🔍 How to Verify
Check if Vulnerable:
Check if Ocomon version is below 4.0.1 and if users-grid-data.php is accessible without authentication.Check Version:
Check Ocomon admin panel or version file in installation directory.Verify Fix Applied:
Verify Ocomon version is 4.0.1 or higher and test that users-grid-data.php no longer discloses sensitive information.📡 Detection & Monitoring
Log Indicators:
- HTTP requests to users-grid-data.php from unauthorized IPs
- Unusual access patterns to user data endpoints
Network Indicators:
- Traffic to users-grid-data.php from external sources
- Data exfiltration patterns
SIEM Query:
source="web_logs" AND uri="*users-grid-data.php*" AND NOT src_ip IN (authorized_ips)