CVE-2023-48396
📋 TL;DR
This CVE describes an authentication bypass vulnerability in Apache SeaTunnel where a hardcoded JWT secret key allows attackers to forge authentication tokens. Attackers can impersonate any user and gain unauthorized access to the system. This affects all users running Apache SeaTunnel version 1.0.0.
💻 Affected Systems
- Apache SeaTunnel
📦 What is this software?
Seatunnel by Apache
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where attackers gain administrative access, steal sensitive data, execute arbitrary code, and pivot to other systems.
Likely Case
Unauthorized access to SeaTunnel instances leading to data theft, configuration manipulation, and privilege escalation within the application.
If Mitigated
Limited impact if proper network segmentation and additional authentication layers are in place, though authentication bypass remains possible.
🎯 Exploit Status
Exploitation requires only reading the hardcoded key from the application.yml file and using standard JWT libraries to create forged tokens.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.1
Vendor Advisory: https://lists.apache.org/thread/1tdxfjksx0vb9gtyt77wlr6rdcy1qwmw
Restart Required: Yes
Instructions:
1. Download Apache SeaTunnel version 1.0.1 from official sources. 2. Stop the SeaTunnel service. 3. Replace the installation with version 1.0.1. 4. Restart the SeaTunnel service. 5. Verify the version is now 1.0.1.
🔧 Temporary Workarounds
Custom JWT Secret Configuration
allManually replace the hardcoded JWT secret with a strong, unique secret in the application.yml file
sed -i 's/jwt.secret: "hardcoded-secret"/jwt.secret: "your-strong-random-secret-here"/' /path/to/seatunnel-server/seatunnel-app/src/main/resources/application.yml
🧯 If You Can't Patch
- Implement network-level access controls to restrict SeaTunnel access to trusted IP addresses only.
- Deploy a web application firewall (WAF) with JWT validation rules to detect forged tokens.
🔍 How to Verify
Check if Vulnerable:
Check if the application.yml file contains a hardcoded JWT secret and if the SeaTunnel version is 1.0.0.Check Version:
Check the SeaTunnel startup logs or configuration files for version information, or run: grep -r "version" /path/to/seatunnel/ | grep "1.0.0"Verify Fix Applied:
Verify the JWT secret in application.yml has been changed from the default and that SeaTunnel version is 1.0.1 or higher.📡 Detection & Monitoring
Log Indicators:
- Failed login attempts followed by successful logins with unusual user accounts
- Authentication logs showing token validation failures or successful logins with invalid tokens
Network Indicators:
- Unusual authentication requests to SeaTunnel endpoints
- Traffic patterns showing access from unexpected IP addresses
SIEM Query:
source="seatunnel.log" AND (event="authentication_failure" OR event="authentication_success") | stats count by user, src_ip