CVE-2020-8545
📋 TL;DR
CVE-2020-8545 is a path traversal vulnerability in the Global.py component of the AIL framework version 2.8. This allows attackers to read arbitrary files on the server by manipulating file paths. Anyone running AIL framework 2.8 without the patch is affected.
💻 Affected Systems
- AIL framework
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through reading sensitive configuration files, credentials, or SSH keys, potentially leading to lateral movement and data exfiltration.
Likely Case
Unauthorized access to sensitive files containing configuration data, API keys, or other credentials stored on the AIL server.
If Mitigated
Limited impact with proper file permissions and network segmentation, potentially only exposing non-sensitive files.
🎯 Exploit Status
The vulnerability is simple to exploit with basic HTTP requests. The GitHub commit shows the exact vulnerable code pattern.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Fixed in commit e808840f957c810b8e3944cba808716dc722581b and later versions
Vendor Advisory: https://github.com/CIRCL/AIL-framework/commit/e808840f957c810b8e3944cba808716dc722581b
Restart Required: Yes
Instructions:
1. Update AIL framework to latest version. 2. Apply the specific commit e808840f957c810b8e3944cba808716dc722581b if not updating fully. 3. Restart the AIL framework service.
🔧 Temporary Workarounds
Input Validation Filter
linuxAdd input validation to reject path traversal sequences in file requests
Modify Global.py to sanitize user input before file operations
Network Restriction
linuxRestrict access to AIL web interface to trusted networks only
iptables -A INPUT -p tcp --dport [AIL_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [AIL_PORT] -j DROP
🧯 If You Can't Patch
- Implement strict file permissions to limit accessible files to non-sensitive directories
- Deploy a web application firewall (WAF) with path traversal protection rules
🔍 How to Verify
Check if Vulnerable:
Check if running AIL framework version 2.8 by examining the version file or installation directoryCheck Version:
cat /path/to/ail/VERSION or check the git log for commit historyVerify Fix Applied:
Verify the commit hash includes e808840f957c810b8e3944cba808716dc722581b or test with a path traversal payload that should be rejected📡 Detection & Monitoring
Log Indicators:
- HTTP requests containing '../' sequences in file parameters
- Access to unexpected file paths in web server logs
Network Indicators:
- HTTP requests with path traversal payloads to AIL endpoints
SIEM Query:
source="web_access.log" AND (url="*../*" OR url="*..\\*" OR url="*%2e%2e%2f*") AND dest_port="[AIL_PORT]"