CVE-2021-43439
📋 TL;DR
CVE-2021-43439 is a remote code execution vulnerability in the Add Review function of iResturant 1.0 that allows unauthenticated attackers to execute arbitrary commands on the server. This affects all installations of iResturant 1.0 that have the vulnerable review functionality exposed. Attackers can gain complete control of affected systems.
💻 Affected Systems
- iResturant
📦 What is this software?
Iresturant by Iresturant Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to install malware, steal data, pivot to other systems, or establish persistent backdoor access.
Likely Case
Attacker executes commands to deface website, steal database contents, or install cryptocurrency miners.
If Mitigated
If properly segmented and monitored, impact limited to the web server with no lateral movement to other systems.
🎯 Exploit Status
Exploit code is publicly available and requires minimal technical skill to execute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch exists. Consider migrating to alternative restaurant management software or implementing workarounds.
🔧 Temporary Workarounds
Disable Add Review Function
allRemove or disable the vulnerable review submission functionality
# Remove review.php or disable the route in your web server configuration
Input Validation Filter
allAdd strict input validation to sanitize user input in review forms
# Implement PHP input sanitization: filter_var($input, FILTER_SANITIZE_STRING);
🧯 If You Can't Patch
- Implement web application firewall (WAF) with RCE protection rules
- Network segmentation to isolate iResturant from critical systems
🔍 How to Verify
Check if Vulnerable:
Check if review.php exists and accepts unsanitized input. Test with controlled payloads in review form fields.Check Version:
# Check iResturant version in configuration files or databaseVerify Fix Applied:
Attempt exploitation with test payloads after implementing workarounds. Verify review functionality is disabled or properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to review.php with command-like parameters
- System command execution in web server logs
- Multiple failed exploitation attempts
Network Indicators:
- Outbound connections from web server to suspicious IPs
- Unusual process spawning from web server
SIEM Query:
source="web_server" AND (url="*review.php*" AND (param="*cmd*" OR param="*system*" OR param="*exec*"))