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How the CVE Works
The vulnerability in OctoPrint (CVE-2024-XXXX) allows attackers with `FILE_UPLOAD` permissions to manipulate file upload requests and exfiltrate arbitrary files from the host system. The flaw stems from improper validation of internal form inputs in HTTP requests to upload endpoints. By crafting a malicious request containing specially formatted form data, an attacker can trick OctoPrint into moving sensitive files (e.g., configuration files, system files) into the upload directory. Once relocated, these files become accessible for download via OctoPrint’s web interface.
The exploit leverages endpoints like /api/files/{local|sdcard}, /api/languages, and plugin-specific upload handlers. The server mistakenly processes internal fields (e.g., _file_move) as user-controlled input, allowing unauthorized file relocation. This could lead to secret leakage (API keys, credentials) or system disruption if critical runtime files are deleted.
DailyCVE Form
Platform: OctoPrint
Version: <= 1.11.1
Vulnerability: Arbitrary File Exfiltration
Severity: Critical
Date: 2024-XX-XX
Prediction: Patch expected by 2024-03-15
What Undercode Say:
Exploitation:
import requests
target = "http://octoprint.local/api/files/local"
malicious_file = {"file": ("exploit.txt", "payload"), "_file_move": "/etc/passwd"}
requests.post(target, files=malicious_file, headers={"X-Api-Key": "ATTACKER_API_KEY"})
Detection:
grep -r "_file_move" /path/to/octoprint/plugins/
Mitigation:
1. Immediate Fix: Upgrade to OctoPrint 1.11.2+.
- Workaround: Restrict `FILE_UPLOAD` permissions; audit plugin upload handlers.
3. Network Controls:
iptables -A INPUT -p tcp --dport 5000 -s !TRUSTED_IP -j DROP
Post-Exploit Analysis:
Check for suspicious file movements: find /var/lib/octoprint/uploads/ -mtime -1 -type f -ls
Patch Analysis:
The fix sanitizes form inputs by stripping internal fields (_file_move) before processing. Code snippet from patch:
def sanitize_upload(request):
for field in list(request.files):
if field.startswith('_'):
request.files.pop(field)
References:
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
