CVE-2022-32096
📋 TL;DR
CVE-2022-32096 is a buffer overflow vulnerability in Rhonabwy's JWE decryption component that allows attackers to cause Denial of Service (DoS) by sending specially crafted JWE tokens. This affects systems using Rhonabwy library versions before 1.1.5 for JWE token processing.
💻 Affected Systems
- Rhonabwy JWE/JWT library
📦 What is this software?
Rhonabwy by Rhonabwy Project
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption through DoS, potentially leading to system crashes or resource exhaustion.
Likely Case
Service disruption through DoS attacks, requiring restart of affected services.
If Mitigated
Limited impact with proper input validation and monitoring in place.
🎯 Exploit Status
Exploitation requires sending crafted JWE tokens to vulnerable endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.5 and later
Vendor Advisory: https://github.com/babelouest/rhonabwy/commit/b4c2923a1ba4fabf9b55a89244127e153a3e549b
Restart Required: Yes
Instructions:
1. Update Rhonabwy to version 1.1.5 or later. 2. Rebuild and redeploy applications using the library. 3. Restart affected services.
🔧 Temporary Workarounds
Input validation and filtering
allImplement strict input validation for JWE tokens before passing to Rhonabwy functions.
Rate limiting
allImplement rate limiting on JWE token processing endpoints to limit DoS impact.
🧯 If You Can't Patch
- Implement WAF rules to block suspicious JWE tokens
- Isolate vulnerable services behind reverse proxies with request filtering
🔍 How to Verify
Check if Vulnerable:
Check Rhonabwy library version in your application dependencies. If version < 1.1.5, you are vulnerable.Check Version:
Check package manager (npm, pip, etc.) or build configuration for Rhonabwy versionVerify Fix Applied:
Verify Rhonabwy version is 1.1.5 or later after update and test JWE token processing functionality.📡 Detection & Monitoring
Log Indicators:
- Application crashes or abnormal exits during JWE processing
- High error rates from JWE decryption functions
- Unusual memory usage patterns
Network Indicators:
- Multiple failed JWE token submissions
- Unusually large JWE tokens
- Spike in requests to JWE endpoints
SIEM Query:
source="application_logs" AND ("r_jwe_aesgcm_key_unwrap" OR "JWE decryption error") AND severity=ERROR