CVE-2025-31477
📋 TL;DR
CVE-2025-31477 is a critical vulnerability in Tauri's shell plugin that allows remote code execution. The open endpoint fails to properly validate allowed protocols, enabling attackers to use dangerous protocols like file://, smb://, or nfs:// to execute arbitrary code. This affects Tauri applications using the shell plugin before version 2.2.1.
💻 Affected Systems
- Tauri shell plugin
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise via remote code execution, allowing attackers to install malware, steal data, or pivot to other systems.
Likely Case
Local file system access, network share enumeration, or execution of malicious scripts through protocol handlers.
If Mitigated
Limited impact if proper input validation and protocol restrictions are implemented, preventing dangerous protocol usage.
🎯 Exploit Status
Exploitation requires either direct endpoint exposure to users or frontend code execution in a Tauri app.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.2.1
Vendor Advisory: https://github.com/tauri-apps/plugins-workspace/security/advisories/GHSA-c9pr-q8gx-3mgp
Restart Required: Yes
Instructions:
1. Update Tauri shell plugin to version 2.2.1 or later. 2. Update package.json dependencies to 'shell: ^2.2.1'. 3. Rebuild and redeploy the Tauri application.
🔧 Temporary Workarounds
Disable shell plugin open endpoint
allRemove or disable the shell plugin's open endpoint if not required.
Remove 'shell' plugin from tauri.conf.json or disable open functionality
Implement strict input validation
allAdd custom validation to restrict allowed protocols before calling the open endpoint.
Implement allowlist validation for protocols (e.g., only https, mailto) in frontend code
🧯 If You Can't Patch
- Isolate the Tauri application in a restricted environment with limited network and filesystem access.
- Implement network segmentation and firewall rules to block SMB, NFS, and other dangerous protocols.
🔍 How to Verify
Check if Vulnerable:
Check package.json or Cargo.toml for shell plugin version below 2.2.1.Check Version:
npm list @tauri-apps/plugin-shell or check Cargo.lock for versionVerify Fix Applied:
Confirm shell plugin version is 2.2.1 or higher in dependencies and rebuilt application.📡 Detection & Monitoring
Log Indicators:
- Unusual protocol handlers invoked (file://, smb://, nfs://) from Tauri applications
- Shell plugin open calls with non-standard protocols
Network Indicators:
- Unexpected SMB or NFS traffic originating from Tauri application hosts
SIEM Query:
source="tauri_app" AND (protocol="file://" OR protocol="smb://" OR protocol="nfs://")