CVE-2025-67728
📋 TL;DR
CVE-2025-67728 is a command injection vulnerability in Fireshare that allows authenticated users (or unauthenticated users if Public Uploads is enabled) to execute arbitrary system commands by uploading files with malicious filenames. This can lead to remote code execution, file uploads to arbitrary directories via path traversal, and complete system compromise. All Fireshare instances running version 1.2.30 or below are affected.
💻 Affected Systems
- Fireshare
📦 What is this software?
Fireshare by Shaneisrael
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining root/system-level access, installing persistent backdoors, exfiltrating sensitive data, and pivoting to other systems.
Likely Case
Attacker uploads web shells, executes arbitrary commands to steal credentials or data, and establishes persistence on the compromised server.
If Mitigated
Limited impact with proper network segmentation, minimal privileges, and monitoring catching exploitation attempts before significant damage.
🎯 Exploit Status
Exploit requires minimal technical skill. Public PoC available in GitHub advisory. Weaponization likely due to low complexity and high impact.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.3.0
Vendor Advisory: https://github.com/ShaneIsrael/fireshare/security/advisories/GHSA-c4f5-g622-q72m
Restart Required: Yes
Instructions:
1. Backup your Fireshare data and configuration. 2. Update to version 1.3.0 or later using your deployment method (Docker, manual install, etc.). 3. Restart the Fireshare service. 4. Verify the update was successful.
🔧 Temporary Workarounds
Disable Public Uploads
allPrevents unauthenticated exploitation by disabling the Public Uploads feature
Set 'publicUploads' to false in Fireshare configuration
Restrict Upload Directory Permissions
linuxLimit damage by restricting write permissions on upload directories
chmod 755 /path/to/fireshare/uploads
chown www-data:www-data /path/to/fireshare/uploads
🧯 If You Can't Patch
- Disable Public Uploads feature immediately
- Implement strict WAF rules to block filenames containing shell metacharacters and path traversal sequences
🔍 How to Verify
Check if Vulnerable:
Check Fireshare version. If version is 1.2.30 or below, system is vulnerable.Check Version:
Check Fireshare web interface settings or run: docker exec fireshare_container cat /app/package.json | grep versionVerify Fix Applied:
Verify Fireshare version is 1.3.0 or higher. Test upload functionality with safe filenames to ensure it works.📡 Detection & Monitoring
Log Indicators:
- Unusual filenames containing shell metacharacters (;, &, |, $, `)
- Multiple failed upload attempts with suspicious filenames
- Commands executed from Fireshare process with unusual arguments
Network Indicators:
- HTTP POST requests to upload endpoints with filenames containing shell metacharacters
- Outbound connections from Fireshare server to unknown IPs
SIEM Query:
source="fireshare.log" AND (filename="*;*" OR filename="*&*" OR filename="*|*" OR filename="*`*" OR filename="*$*" OR filename="*..*" OR filename="*/../*")