CVE-2020-17479
📋 TL;DR
CVE-2020-17479 is an input validation vulnerability in jpv (Json Pattern Validator) that allows attackers to bypass validation logic through specially crafted corrupted arrays. This affects any application using vulnerable versions of jpv for JSON validation, potentially leading to data corruption or injection attacks. The vulnerability is particularly dangerous in applications that rely on jpv for security-critical input validation.
💻 Affected Systems
- jpv (Json Pattern Validator)
📦 What is this software?
Json Pattern Validator by Json Pattern Validator Project
⚠️ Risk & Real-World Impact
Worst Case
Complete bypass of JSON validation leading to injection attacks, data corruption, or remote code execution depending on how the application processes the malformed input.
Likely Case
Data integrity issues, unexpected application behavior, or partial validation bypass allowing some malicious input through.
If Mitigated
Limited impact with proper input sanitization at multiple layers and defense-in-depth controls.
🎯 Exploit Status
The vulnerability is simple to exploit by sending specially crafted corrupted arrays. Public proof-of-concept exists in the GitHub issue.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2.2
Vendor Advisory: https://github.com/manvel-khnkoyan/jpv/commit/e3eec1215caa8d5c560f5e88d0943422831927d6
Restart Required: No
Instructions:
1. Update jpv package to version 2.2.2 or later using npm update jpv. 2. Test that JSON validation works correctly with edge cases. 3. Deploy updated application.
🔧 Temporary Workarounds
Input sanitization wrapper
allImplement additional input validation before passing data to jpv
🧯 If You Can't Patch
- Implement strict input validation at the application layer before using jpv
- Use alternative JSON validation libraries temporarily
🔍 How to Verify
Check if Vulnerable:
Check package.json or run npm list jpv to see if version is below 2.2.2Check Version:
npm list jpvVerify Fix Applied:
Verify jpv version is 2.2.2 or higher and test with known malicious arrays📡 Detection & Monitoring
Log Indicators:
- Unexpected validation failures
- Application errors when processing JSON arrays
- Unusual input patterns in JSON payloads
Network Indicators:
- HTTP requests with malformed JSON arrays to endpoints using jpv
SIEM Query:
source="application_logs" AND ("validation error" OR "jpv" OR "JSON parse error")🔗 References
- https://blog.sonatype.com/cve-2020-17479
- https://github.com/manvel-khnkoyan/jpv/commit/e3eec1215caa8d5c560f5e88d0943422831927d6
- https://github.com/manvel-khnkoyan/jpv/issues/10
- https://www.npmjs.com/package/jpv
- https://blog.sonatype.com/cve-2020-17479
- https://github.com/manvel-khnkoyan/jpv/commit/e3eec1215caa8d5c560f5e88d0943422831927d6
- https://github.com/manvel-khnkoyan/jpv/issues/10
- https://www.npmjs.com/package/jpv
