CVE-2022-21241
📋 TL;DR
CVE-2022-21241 is a cross-site scripting vulnerability in CSV+ versions prior to 0.8.1 that allows remote unauthenticated attackers to inject malicious scripts or OS commands via specially crafted CSV files containing HTML anchor tags. This affects any system using vulnerable CSV+ library versions to process CSV files from untrusted sources.
💻 Affected Systems
- CSV+
📦 What is this software?
Csv\+ by Csv\+ Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise through OS command execution leading to data theft, ransomware deployment, or lateral movement within the network.
Likely Case
Cross-site scripting attacks leading to session hijacking, credential theft, or defacement of web applications using CSV+.
If Mitigated
Limited impact with proper input validation and output encoding preventing script execution.
🎯 Exploit Status
Exploitation requires only a malicious CSV file to be processed by vulnerable CSV+ implementation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.8.1
Vendor Advisory: https://github.com/plusone-masaki/csv-plus/releases/tag/v0.8.1
Restart Required: No
Instructions:
1. Update CSV+ to version 0.8.1 or later. 2. For package managers: 'npm update csv-plus' or equivalent. 3. Verify installation with version check.
🔧 Temporary Workarounds
Input Validation Filter
allImplement strict input validation to reject CSV files containing HTML tags or suspicious content.
Implement server-side validation to scan CSV files for <a> tags and other HTML elements before processing.
Output Encoding
allApply proper output encoding when displaying CSV content in web applications.
Use HTML entity encoding for all user-controlled content displayed in web interfaces.
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution.
- Isolate CSV processing to dedicated sandboxed environments with limited permissions.
🔍 How to Verify
Check if Vulnerable:
Check package.json or dependency manifest for CSV+ version below 0.8.1.Check Version:
npm list csv-plus | grep csv-plusVerify Fix Applied:
Confirm CSV+ version is 0.8.1 or higher in package dependencies.📡 Detection & Monitoring
Log Indicators:
- Unusual CSV file processing errors
- Unexpected script execution in web logs
- CSV files with embedded HTML content
Network Indicators:
- CSV file uploads containing HTML tags
- Unexpected outbound connections after CSV processing
SIEM Query:
source="web_server" AND ("CSV" OR ".csv") AND ("<a" OR "href=" OR "javascript:")