CVE-2020-22403
📋 TL;DR
This CSRF vulnerability in Express Cart v1.1.16 allows attackers to trick authenticated administrators into performing unauthorized actions like adding new admin accounts or discount codes. Any organization using the vulnerable version of this e-commerce platform is affected. The attack requires an administrator to be logged in and visit a malicious page.
💻 Affected Systems
- Express Cart
📦 What is this software?
Express Cart by Express Cart Project
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the e-commerce platform with attacker creating administrator accounts, manipulating pricing/discounts, stealing customer data, and potentially taking full control of the system.
Likely Case
Attackers create backdoor administrator accounts to maintain persistent access, manipulate pricing/discounts for financial gain, or modify store settings.
If Mitigated
With proper CSRF protections and administrator awareness, the attack would fail as legitimate requests would include proper tokens and administrators wouldn't visit malicious sites while logged in.
🎯 Exploit Status
Exploitation requires an authenticated administrator session. The GitHub issue shows proof-of-concept exploitation details. CSRF attacks are commonly weaponized due to their simplicity.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after v1.1.16
Vendor Advisory: https://github.com/mrvautin/expressCart/issues/120
Restart Required: Yes
Instructions:
1. Backup your current installation and database. 2. Update Express Cart to the latest version. 3. Restart the Express Cart application. 4. Verify CSRF tokens are now properly implemented in all forms.
🔧 Temporary Workarounds
Implement CSRF Protection Middleware
allAdd CSRF token validation to all POST/PUT/DELETE endpoints
npm install csurf
Add app.use(csurf()) middleware before routes
SameSite Cookie Enforcement
allConfigure session cookies with SameSite=Strict attribute
app.use(session({cookie: {sameSite: 'strict'}}))
🧯 If You Can't Patch
- Implement a web application firewall (WAF) with CSRF protection rules
- Require administrators to use separate browsers for admin tasks vs general browsing
🔍 How to Verify
Check if Vulnerable:
Check package.json for version 1.1.16 and verify forms lack CSRF tokensCheck Version:
cat package.json | grep versionVerify Fix Applied:
Verify forms now include CSRF tokens and POST requests fail without valid tokens📡 Detection & Monitoring
Log Indicators:
- Multiple administrator account creations from same IP
- Unexpected discount code additions
- POST requests to admin endpoints without referrer headers
Network Indicators:
- HTTP requests to admin endpoints with missing CSRF tokens
- Requests from unexpected referrers to sensitive endpoints
SIEM Query:
source="express-cart-logs" AND (uri="/admin/*" OR uri="/api/*") AND method="POST" AND NOT csrf_token=*