CVE-2022-23623
📋 TL;DR
CVE-2022-23623 is an input validation vulnerability in the Frourio TypeScript framework where validators fail to properly validate request bodies and queries in specific situations, allowing unvalidated input to pass through. This affects Frourio users running versions prior to v0.26.0 who have integrated class-validator through the validators/ folder. The vulnerability could allow attackers to bypass input validation controls.
💻 Affected Systems
- Frourio
📦 What is this software?
Frourio by Frourio
⚠️ Risk & Real-World Impact
Worst Case
Attackers could inject malicious payloads that bypass validation, potentially leading to remote code execution, data corruption, or privilege escalation depending on how the unvalidated input is processed.
Likely Case
Input validation bypass allowing injection attacks (SQL injection, XSS, command injection) or business logic manipulation through malformed requests.
If Mitigated
With proper input validation at other layers or strict output encoding, impact could be limited to minor data integrity issues.
🎯 Exploit Status
Exploitation requires sending specially crafted requests to endpoints that would normally validate input. No authentication bypass is needed if endpoints are publicly accessible.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v0.26.0 and later
Vendor Advisory: https://github.com/frouriojs/frourio/security/advisories/GHSA-8xxm-h73r-ghfj
Restart Required: Yes
Instructions:
1. Update Frourio to v0.26.0 or later using npm: npm update frourio@^0.26.0. 2. Install required dependencies: npm install class-transformer reflect-metadata. 3. Restart the application server.
🔧 Temporary Workarounds
Disable vulnerable endpoints
allTemporarily disable or restrict access to endpoints using class-validator through the validators/ folder
Implement additional validation layer
allAdd custom middleware to validate all request bodies and queries before they reach the vulnerable validators
🧯 If You Can't Patch
- Implement Web Application Firewall (WAF) rules to block suspicious input patterns
- Add additional input validation at the application level outside of Frourio's validator system
🔍 How to Verify
Check if Vulnerable:
Check package.json for frourio version <0.26.0 and verify if class-validator is used through the validators/ folderCheck Version:
npm list frourioVerify Fix Applied:
Confirm frourio version is >=0.26.0 and both class-transformer and reflect-metadata are installed📡 Detection & Monitoring
Log Indicators:
- Unusual request patterns bypassing validation, unexpected input in request bodies/queries
Network Indicators:
- Requests with malformed parameters that should be rejected by validation
SIEM Query:
source="application_logs" AND (message="validation error" OR message="unexpected input") AND NOT (message="validation passed")🔗 References
- https://github.com/frouriojs/frourio/commit/7c19ac5363305b81b1c6b5232620228763d427af
- https://github.com/frouriojs/frourio/security/advisories/GHSA-8xxm-h73r-ghfj
- https://github.com/frouriojs/frourio/commit/7c19ac5363305b81b1c6b5232620228763d427af
- https://github.com/frouriojs/frourio/security/advisories/GHSA-8xxm-h73r-ghfj
