CVE-2020-27575
📋 TL;DR
CVE-2020-27575 is a command injection vulnerability in Maxum Rumpus web administration that allows authenticated administrators to execute arbitrary commands on the server. This affects Rumpus versions 8.2.13 and 8.2.14. Attackers with admin access can exploit this to gain full control of the affected system.
💻 Affected Systems
- Maxum Rumpus
📦 What is this software?
Rumpus by Maxum
Rumpus by Maxum
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands with server privileges, install malware, exfiltrate data, or pivot to other systems.
Likely Case
Attackers with compromised admin credentials or existing access can execute commands to steal data, install backdoors, or disrupt services.
If Mitigated
With proper network segmentation and admin credential protection, impact limited to isolated server compromise.
🎯 Exploit Status
Exploitation requires admin credentials. Public technical details and proof-of-concept are available in the referenced GitHub pages.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.2.15 or later
Vendor Advisory: http://maxum.com
Restart Required: Yes
Instructions:
1. Download Rumpus 8.2.15 or later from Maxum website. 2. Backup current configuration. 3. Install the updated version. 4. Restart Rumpus service. 5. Verify functionality.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit access to Rumpus admin interface to trusted IP addresses only
Disable User Management
allTemporarily disable user management functionality if not required
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Rumpus server from critical systems
- Enforce strong authentication and monitor admin account activity for suspicious behavior
🔍 How to Verify
Check if Vulnerable:
Check Rumpus version in admin interface or configuration files. Versions 8.2.13 or 8.2.14 are vulnerable.Check Version:
Check Rumpus admin dashboard or configuration files for version informationVerify Fix Applied:
Verify Rumpus version is 8.2.15 or later. Test user management functionality to ensure commands cannot be injected.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed admin login attempts followed by successful login
- Suspicious user management activities
Network Indicators:
- Unusual outbound connections from Rumpus server
- Traffic to command and control servers
SIEM Query:
source="rumpus" AND (event="command_execution" OR event="user_modified")