CVE-2024-56201
📋 TL;DR
A vulnerability in Jinja templating engine allows attackers who control both template content and filename to execute arbitrary Python code, bypassing Jinja's sandbox protection. This affects applications that execute untrusted templates where users can also specify template filenames. The vulnerability is present in Jinja 3.x versions before 3.1.5.
💻 Affected Systems
- Jinja
📦 What is this software?
Jinja by Palletsprojects
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment.
Likely Case
Limited code execution within application context, potentially leading to data exposure or privilege escalation.
If Mitigated
No impact if applications don't allow untrusted template execution with user-controlled filenames.
🎯 Exploit Status
Requires attacker to control both template content and filename, which depends on application implementation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.1.5
Vendor Advisory: https://github.com/pallets/jinja/security/advisories/GHSA-gmj6-6f8f-6699
Restart Required: Yes
Instructions:
1. Update Jinja to version 3.1.5 or later using pip: pip install --upgrade Jinja2>=3.1.5
2. Restart all applications using Jinja
3. Verify the update was successful
🔧 Temporary Workarounds
Restrict template filename control
allModify applications to prevent users from controlling template filenames when executing untrusted templates.
Disable untrusted template execution
allConfigure applications to only execute trusted, pre-defined templates.
🧯 If You Can't Patch
- Implement strict input validation for template filenames
- Isolate Jinja execution environment using containerization or sandboxing
🔍 How to Verify
Check if Vulnerable:
Check Jinja version: python -c "import jinja2; print(jinja2.__version__)" and verify if it's below 3.1.5Check Version:
python -c "import jinja2; print(jinja2.__version__)"Verify Fix Applied:
Confirm Jinja version is 3.1.5 or higher using the same command📡 Detection & Monitoring
Log Indicators:
- Unusual template file names
- Unexpected Python execution errors in Jinja context
Network Indicators:
- Unusual outbound connections from application servers
SIEM Query:
Search for application logs containing 'jinja' and 'template' with suspicious filenames or execution errors