CVE-2025-64757
📋 TL;DR
A vulnerability in Astro framework's development server allows attackers to read arbitrary local image files through the image optimization endpoint. This affects Astro development environments running versions before 5.14.3, potentially exposing sensitive image files accessible to the Node.js process.
💻 Affected Systems
- Astro web framework
📦 What is this software?
Astro by Astro
⚠️ Risk & Real-World Impact
Worst Case
Attackers exfiltrate sensitive image files containing credentials, personal data, or proprietary information from the host system.
Likely Case
Local file disclosure of image files in development directories, potentially exposing development artifacts or configuration files.
If Mitigated
Limited to reading image files only, with no write or execution capabilities.
🎯 Exploit Status
Exploitation requires access to the development server endpoint. No authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.14.3
Vendor Advisory: https://github.com/withastro/astro/security/advisories/GHSA-x3h8-62x9-952g
Restart Required: Yes
Instructions:
1. Update Astro package: npm update astro@5.14.3 or yarn upgrade astro@5.14.3
2. Restart development server
3. Verify version is 5.14.3 or higher
🔧 Temporary Workarounds
Disable development server
allStop using the vulnerable development server in affected environments
Stop the development server process
Network isolation
allEnsure development server is not accessible from untrusted networks
Configure firewall to restrict access to development server port
🧯 If You Can't Patch
- Ensure development servers are not accessible from untrusted networks or the internet
- Run development servers with minimal file system permissions and in isolated environments
🔍 How to Verify
Check if Vulnerable:
Check if Astro version is below 5.14.3 and development server is runningCheck Version:
npm list astro or check package.json for astro versionVerify Fix Applied:
Confirm Astro version is 5.14.3 or higher and test image optimization endpoint with path traversal attempts📡 Detection & Monitoring
Log Indicators:
- Unusual file path patterns in image optimization requests
- Multiple failed image optimization attempts with path traversal patterns
Network Indicators:
- HTTP requests to image optimization endpoint with suspicious path parameters
- Unusual outbound data transfers from development server
SIEM Query:
http.path:"/_image" AND (http.uri:".." OR http.uri:"%2e%2e")