CVE-2023-48835
📋 TL;DR
Car Rental Script v3.0 contains a CSV injection vulnerability in the Language > Labels > Export functionality. This allows attackers to inject malicious formulas into exported CSV files, which can execute code when opened in spreadsheet applications. Anyone using Car Rental Script v3.0 with the export feature enabled is affected.
💻 Affected Systems
- Car Rental Script
📦 What is this software?
Car Rental Script by Phpjabbers
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution on client machines when victims open malicious CSV files, potentially leading to full system compromise, data theft, or ransomware deployment.
Likely Case
Formula injection leading to command execution on client workstations, data exfiltration, or phishing attacks leveraging the trusted export functionality.
If Mitigated
Limited impact with proper user awareness training about opening untrusted CSV files and spreadsheet security settings enabled.
🎯 Exploit Status
Exploitation requires authenticated access to the export functionality. CSV injection techniques are well-documented and easy to implement.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.phpjabbers.com/car-rental-script/
Restart Required: No
Instructions:
No official patch available. Contact vendor for updated version or apply workarounds.
🔧 Temporary Workarounds
Disable CSV Export Feature
allRemove or restrict access to the Language > Labels > Export functionality in the admin panel.
Implement CSV Sanitization
allAdd server-side validation to escape or remove formula characters (=, +, -, @) from exported CSV data.
Modify export script to prepend single quotes to formula-like cells or strip dangerous characters
🧯 If You Can't Patch
- Restrict admin panel access to trusted users only using IP whitelisting or VPN.
- Implement web application firewall rules to block CSV injection payloads in export requests.
🔍 How to Verify
Check if Vulnerable:
Test by exporting labels with payload like =cmd|' /C calc'!A0 in label fields and check if formula executes when opened in Excel.Check Version:
Check script version in admin panel or readme files.Verify Fix Applied:
Verify exported CSV files have dangerous characters escaped or prepended with single quotes.📡 Detection & Monitoring
Log Indicators:
- Unusual export requests with formula characters in parameters
- Multiple export requests from single user in short time
Network Indicators:
- HTTP POST requests to export endpoints containing =, +, @ characters in payload
SIEM Query:
source="web_logs" AND uri_path="/admin/export" AND (request_body LIKE "%=%" OR request_body LIKE "%+%" OR request_body LIKE "%@%")