CVE-2020-35273
📋 TL;DR
This CSRF vulnerability in EgavilanMedia User Registration & Login System 1.0 allows attackers to trick authenticated users into submitting malicious requests that can update any user's account, including privilege escalation. All users of this specific software version are affected. The attack requires the victim to be logged into the vulnerable system.
💻 Affected Systems
- EgavilanMedia User Registration & Login System with Admin Panel
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could gain administrative privileges, take over all user accounts, modify system settings, or deploy backdoors for persistent access.
Likely Case
Attackers would typically modify victim accounts to change passwords, email addresses, or user roles to gain unauthorized access.
If Mitigated
With proper CSRF protections, the attack would fail as the system would reject unauthorized cross-origin requests.
🎯 Exploit Status
Exploit requires the victim to be authenticated and visit a malicious page while logged in. Public exploit code is available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://egavilanmedia.com
Restart Required: No
Instructions:
No official patch available. Consider implementing CSRF tokens manually or replacing the software.
🔧 Temporary Workarounds
Implement CSRF Token Protection
allAdd CSRF tokens to all state-changing forms and validate them server-side
Manual code modification required - add unique tokens to forms and validate on submission
SameSite Cookie Attribute
allSet SameSite=Strict or SameSite=Lax on session cookies
Set-Cookie: session=value; SameSite=Strict; Secure; HttpOnly
🧯 If You Can't Patch
- Implement WAF rules to detect and block CSRF patterns
- Monitor user account changes and implement approval workflows for sensitive modifications
🔍 How to Verify
Check if Vulnerable:
Check if forms in User Profile panel lack CSRF tokens and accept POST requests without token validationCheck Version:
Check software version in admin panel or configuration filesVerify Fix Applied:
Test that all forms now include unique CSRF tokens that are validated server-side📡 Detection & Monitoring
Log Indicators:
- Multiple user profile updates from same IP in short time
- User role changes without proper authentication logs
Network Indicators:
- POST requests to user profile endpoints without Referer header validation
- Requests with missing or invalid CSRF tokens
SIEM Query:
source="web_logs" AND (uri="/user/profile/update" OR uri="/admin/user/modify") AND (NOT csrf_token=*)