CVE-2020-25132
📋 TL;DR
CVE-2020-25132 is a critical SQL injection vulnerability in Observium network monitoring software that allows authentication bypass. Any unauthorized user with application access can exploit it by sending malformed array parameters, leading to full system compromise. All Observium Professional, Enterprise, and Community edition users running vulnerable versions are affected.
💻 Affected Systems
- Observium Professional
- Observium Enterprise
- Observium Community
📦 What is this software?
Observium by Observium
Observium by Observium
Observium by Observium
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover: attacker gains administrative access, extracts all monitoring data, modifies configurations, and potentially pivots to other systems in the network.
Likely Case
Authentication bypass leading to unauthorized access to sensitive network monitoring data, configuration modification, and potential privilege escalation.
If Mitigated
Limited impact if proper network segmentation, WAF rules, and authentication controls prevent exploitation attempts.
🎯 Exploit Status
Public proof-of-concept available on GitHub gist. Exploitation requires sending malformed array parameters to bypass SQL injection sanitization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 20.8.10632 and later
Vendor Advisory: https://www.observium.org/
Restart Required: No
Instructions:
1. Backup current Observium installation and database. 2. Update to Observium version 20.8.10632 or later. 3. Apply the patch that fixes parameter type validation in includes/authenticate.inc.php. 4. Verify the fix by testing authentication functionality.
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allImplement WAF rules to block SQL injection patterns and malformed array parameters in Cookie headers.
# Example ModSecurity rule: SecRule ARGS "@rx (\[|\]|array\(|sql.*inject)" "id:1001,phase:2,deny,status:403,msg:'SQLi attempt detected'"
# Example naxsi rule: MainRule "str:\[\]" "msg:array injection" "mz:ARGS|HEADERS" "s:$SQL:4" id:1001;
Network Access Control
linuxRestrict access to Observium web interface to trusted IP addresses only.
# iptables example: iptables -A INPUT -p tcp --dport 80 -s trusted_ip_range -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
# Apache .htaccess: Order Deny,Allow
Deny from all
Allow from 192.168.1.0/24
🧯 If You Can't Patch
- Immediately restrict network access to Observium instances using firewall rules to allow only trusted administrative IPs.
- Implement a reverse proxy with strict input validation and WAF capabilities to filter malicious requests before they reach Observium.
🔍 How to Verify
Check if Vulnerable:
Check Observium version: grep '\$config\[\'version\'\]' includes/definitions.inc.php or check web interface footer. If version is 20.8.10631 or earlier, system is vulnerable.Check Version:
grep "\$config\[\'version\'\]" /opt/observium/includes/definitions.inc.php | cut -d"'" -f4Verify Fix Applied:
After patching, verify version is 20.8.10632 or later. Test authentication with various inputs to ensure SQL injection is no longer possible.📡 Detection & Monitoring
Log Indicators:
- Unusual authentication attempts with malformed parameters
- SQL error messages in application logs
- Multiple failed login attempts followed by successful authentication from same IP
- Requests with array syntax in Cookie headers
Network Indicators:
- HTTP requests with malformed array parameters in headers
- Unusual SQL queries in database logs from web application user
- Traffic patterns showing authentication bypass attempts
SIEM Query:
source="observium_access.log" AND (uri_path="/" OR uri_path="/index.php") AND (http_cookie="*[]*" OR http_cookie="*array(*" OR status_code=500)