CVE-2023-34613
📋 TL;DR
CVE-2023-34613 is a vulnerability in sojo library versions through 1.1.1 that allows attackers to cause denial of service or other impacts by sending crafted objects with cyclic dependencies. This affects any application using vulnerable sojo versions for object serialization/deserialization.
💻 Affected Systems
- sojo
📦 What is this software?
Sojo by Sojo Project
⚠️ Risk & Real-World Impact
Worst Case
Complete application crash leading to sustained denial of service, potential memory exhaustion, and possible remote code execution depending on how sojo is integrated.
Likely Case
Application instability, denial of service through resource exhaustion, and potential data corruption in affected services.
If Mitigated
Limited impact with proper input validation and resource limits, though cyclic dependency handling remains problematic.
🎯 Exploit Status
Proof of concept exists in GitHub issues showing cyclic dependency creation. Exploitation requires sending crafted objects to sojo-processing endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.1.2 or later
Vendor Advisory: https://github.com/maddingo/sojo/issues/15
Restart Required: Yes
Instructions:
1. Update sojo dependency to version 1.1.2 or later. 2. Restart all applications using sojo. 3. Verify no cyclic dependency handling remains in code.
🔧 Temporary Workarounds
Input validation and sanitization
allImplement strict input validation to reject objects with cyclic dependencies before processing with sojo.
Resource limiting
allConfigure application to limit recursion depth and memory usage for object deserialization.
🧯 If You Can't Patch
- Implement WAF rules to detect and block cyclic object patterns in incoming requests.
- Isolate sojo-using services behind additional authentication layers and limit exposure to untrusted networks.
🔍 How to Verify
Check if Vulnerable:
Check package.json or dependency manifest for sojo version <=1.1.1. Run: npm list sojo or check dependency lock files.Check Version:
npm list sojo | grep sojoVerify Fix Applied:
Verify sojo version is >=1.1.2. Test with known cyclic dependency payloads to ensure proper handling.📡 Detection & Monitoring
Log Indicators:
- Stack overflow errors
- Memory exhaustion warnings
- Unusual recursion depth in object processing
- Application crashes during object deserialization
Network Indicators:
- Large nested JSON/object payloads
- Requests with circular references in data structures
- Sudden spikes in memory usage
SIEM Query:
source="application.logs" AND ("stack overflow" OR "maximum call stack" OR "cyclic" OR "recursion depth")