CVE-2024-56140
📋 TL;DR
This vulnerability allows attackers to bypass CSRF protection in Astro web framework by manipulating Content-Type headers. Websites using Astro with security.checkOrigin enabled are affected. Attackers can perform CSRF attacks to execute unauthorized actions on behalf of authenticated users.
💻 Affected Systems
- Astro web framework
📦 What is this software?
Astro by Astro
⚠️ Risk & Real-World Impact
Worst Case
Attackers can perform unauthorized actions as authenticated users, potentially leading to account takeover, data modification, or privilege escalation.
Likely Case
Attackers can trick users into performing unintended actions like changing account settings, making purchases, or modifying content.
If Mitigated
With proper session management and additional security layers, impact is limited to specific endpoints vulnerable to CSRF.
🎯 Exploit Status
Exploitation requires attacker to craft malicious requests with manipulated Content-Type headers and trick authenticated users into executing them.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.16.17
Vendor Advisory: https://github.com/withastro/astro/security/advisories/GHSA-c4pw-33h3-35xw
Restart Required: Yes
Instructions:
1. Update Astro package to version 4.16.17 or later using npm update astro@latest or yarn upgrade astro. 2. Restart your Astro application server. 3. Verify the update was successful.
🔧 Temporary Workarounds
No known workarounds
allThe vendor advisory states there are no known workarounds for this vulnerability
🧯 If You Can't Patch
- Implement additional CSRF protection mechanisms like custom middleware with strict Content-Type validation
- Add SameSite cookie attributes and implement additional request validation at application level
🔍 How to Verify
Check if Vulnerable:
Check if Astro version is below 4.16.17 and security.checkOrigin is enabled in configurationCheck Version:
npm list astro | grep astro or yarn list astro | grep astroVerify Fix Applied:
Verify Astro version is 4.16.17 or higher using npm list astro or yarn list astro📡 Detection & Monitoring
Log Indicators:
- Requests with Content-Type headers containing semicolon-delimited parameters after the type
- CSRF validation failures or bypasses in middleware logs
Network Indicators:
- HTTP requests with Content-Type headers like application/x-www-form-urlencoded; arbitrary-parameter
- POST requests without proper CSRF tokens
SIEM Query:
http.content_type:"application/x-www-form-urlencoded;*" AND http.method:POST🔗 References
- https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS#simple_requests
- https://github.com/withastro/astro/blob/6031962ab5f56457de986eb82bd24807e926ba1b/packages/astro/src/core/app/middlewares.ts
- https://github.com/withastro/astro/commit/e7d14c374b9d45e27089994a4eb72186d05514de
- https://github.com/withastro/astro/security/advisories/GHSA-c4pw-33h3-35xw
