CVE-2021-27514
📋 TL;DR
CVE-2021-27514 is an authentication bypass vulnerability in EyesOfNetwork where short, predictable session IDs (8-10 digits) can be brute-forced. This allows attackers to gain unauthorized access to the web interface without valid credentials. All EyesOfNetwork 5.3-10 installations are affected.
💻 Affected Systems
- EyesOfNetwork
📦 What is this software?
Eyesofnetwork by Eyesofnetwork
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via authentication bypass leading to arbitrary file upload, remote code execution, and privilege escalation as demonstrated in related exploits.
Likely Case
Unauthorized access to the EyesOfNetwork web interface, potentially leading to configuration changes, data exposure, and further exploitation.
If Mitigated
Limited impact if network segmentation, strong authentication controls, and monitoring are in place to detect brute-force attempts.
🎯 Exploit Status
Public exploit code demonstrates complete attack chain from brute-force to RCE. The limited session ID space (8-10 digits) makes brute-forcing practical.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Update to EyesOfNetwork version 5.3-11 or later
Vendor Advisory: https://github.com/EyesOfNetworkCommunity/eonweb/issues/87
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download latest EyesOfNetwork version from official repository. 3. Follow upgrade instructions for your distribution. 4. Restart all EyesOfNetwork services.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict access to EyesOfNetwork web interface to trusted IP addresses only
iptables -A INPUT -p tcp --dport 80 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP
Web Server Rate Limiting
linuxImplement rate limiting on authentication endpoints to prevent brute-force attacks
# Configure in Apache: mod_evasive or mod_security
# Configure in Nginx: limit_req_zone and limit_req directives
🧯 If You Can't Patch
- Implement strict network segmentation to isolate EyesOfNetwork from critical systems
- Deploy a web application firewall (WAF) with brute-force protection rules
🔍 How to Verify
Check if Vulnerable:
Check EyesOfNetwork version: grep 'Version' /usr/share/eyesofnetwork/eonweb/version.txt or check web interface footerCheck Version:
grep 'Version' /usr/share/eyesofnetwork/eonweb/version.txt || cat /usr/share/eyesofnetwork/eonweb/version.txtVerify Fix Applied:
Verify version is 5.3-11 or later and test that session IDs are no longer predictable 8-10 digit integers📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts from single IP
- Successful logins with unusual session ID patterns
- Access to admin pages from unexpected user accounts
Network Indicators:
- High volume of requests to authentication endpoints
- Sequential requests to session-related URLs
SIEM Query:
source="eyesofnetwork.logs" (action="login" AND result="failure") | stats count by src_ip | where count > 10🔗 References
- https://github.com/ArianeBlow/exploit-eyesofnetwork5.3.10/blob/main/PoC-BruteForceID-arbitraty-file-upload-RCE-PrivEsc.py
- https://github.com/EyesOfNetworkCommunity/eonweb/issues/87
- https://github.com/ArianeBlow/exploit-eyesofnetwork5.3.10/blob/main/PoC-BruteForceID-arbitraty-file-upload-RCE-PrivEsc.py
- https://github.com/EyesOfNetworkCommunity/eonweb/issues/87
