CVE-2025-55204
📋 TL;DR
Muffon music streaming client versions before 2.3.0 have a one-click remote code execution vulnerability via specially crafted muffon:// links. When victims visit malicious websites containing these links, the browser triggers Muffon's URL handler, allowing attackers to execute arbitrary code on the victim's machine without further interaction. All users running vulnerable versions are affected.
💻 Affected Systems
- muffon
📦 What is this software?
Muffon by Muffon
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to install malware, steal data, or create persistent backdoors.
Likely Case
Attackers deploy ransomware, cryptocurrency miners, or credential stealers on victim machines.
If Mitigated
No impact if patched or workarounds implemented; otherwise full RCE risk remains.
🎯 Exploit Status
One-click exploitation via malicious links makes this trivial to weaponize; public proof-of-concept exists in advisory.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.0
Vendor Advisory: https://github.com/staniel359/muffon/security/advisories/GHSA-gc3f-gqph-522q
Restart Required: Yes
Instructions:
1. Download muffon v2.3.0 from official GitHub releases. 2. Install the update. 3. Restart the application. 4. Verify version shows 2.3.0 or higher.
🔧 Temporary Workarounds
Unregister muffon URL handler
allRemove muffon:// protocol handler registration to prevent browser triggering
Windows: reg delete "HKCU\Software\Classes\muffon" /f
Linux: Remove ~/.config/muffon or edit desktop entry
macOS: Remove ~/Library/Preferences/com.github.muffon.plist
Browser URL handler blocking
allConfigure browsers to block or prompt for muffon:// links
Firefox: about:config -> set network.protocol-handler.expose.muffon to false
Chrome: chrome://settings/handlers -> block muffon
🧯 If You Can't Patch
- Uninstall muffon completely until patched version can be installed
- Use browser extensions to block all custom protocol handlers or disable JavaScript on untrusted sites
🔍 How to Verify
Check if Vulnerable:
Check muffon version in application settings or About dialog; if version is below 2.3.0, you are vulnerable.Check Version:
muffon --version or check Help > About in applicationVerify Fix Applied:
After updating, verify version shows 2.3.0 or higher in application settings.📡 Detection & Monitoring
Log Indicators:
- Process creation from muffon with unusual command-line arguments
- Network connections from muffon to unexpected destinations
Network Indicators:
- HTTP requests to download payloads following muffon:// link activation
SIEM Query:
Process Creation where Image contains 'muffon' and CommandLine contains suspicious patterns