CVE-2021-41260
📋 TL;DR
CVE-2021-41260 is a Cross-Site Request Forgery (CSRF) vulnerability in Galette, a membership management web application for non-profit organizations. The vulnerability allows attackers to trick authenticated users into performing unintended actions on the application without their consent. All users running Galette versions prior to 0.9.6 are affected.
💻 Affected Systems
- Galette
📦 What is this software?
Galette by Galette
⚠️ Risk & Real-World Impact
Worst Case
Attackers could perform administrative actions like creating new admin accounts, modifying membership data, or deleting critical organizational information by tricking authenticated administrators into clicking malicious links.
Likely Case
Attackers could modify member data, change user permissions, or perform unauthorized actions within the application by exploiting authenticated user sessions.
If Mitigated
With proper CSRF protections implemented, all state-changing requests would require valid anti-CSRF tokens, preventing unauthorized actions even if users click malicious links.
🎯 Exploit Status
Exploitation requires the victim to be authenticated and to interact with a maliciously crafted request, typically via a link or form submission.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.9.6
Vendor Advisory: https://github.com/galette/galette/security/advisories/GHSA-hw28-c7px-xqm5
Restart Required: Yes
Instructions:
1. Backup your Galette database and files. 2. Download Galette 0.9.6 or later from the official repository. 3. Replace existing Galette files with the new version. 4. Clear application cache if applicable. 5. Restart your web server.
🔧 Temporary Workarounds
No official workarounds available
allThe vendor states there are no known workarounds for this vulnerability.
🧯 If You Can't Patch
- Implement strict SameSite cookie policies for session cookies to limit CSRF attack surface.
- Deploy a web application firewall (WAF) with CSRF protection rules to detect and block malicious requests.
🔍 How to Verify
Check if Vulnerable:
Check your Galette version by viewing the application footer or checking the CHANGELOG file. If version is below 0.9.6, you are vulnerable.Check Version:
Check the footer of your Galette installation or examine the CHANGELOG.md file in the installation directory.Verify Fix Applied:
After upgrading, verify the version shows 0.9.6 or higher in the application interface and test that forms include CSRF tokens in POST requests.📡 Detection & Monitoring
Log Indicators:
- Multiple failed state-changing requests from same IP without CSRF tokens
- Unusual administrative actions from non-admin IP addresses
Network Indicators:
- POST requests to Galette endpoints without Referer headers or CSRF tokens
- Requests with suspicious Origin headers
SIEM Query:
source="galette_logs" AND (http_method="POST" AND NOT csrf_token=*) OR (action="admin_operation" AND user_agent="suspicious")🔗 References
- https://github.com/galette/galette/commit/a5602bca2566f1be370631c3ab2d40feedd4b3ad
- https://github.com/galette/galette/security/advisories/GHSA-hw28-c7px-xqm5
- https://github.com/galette/galette/commit/a5602bca2566f1be370631c3ab2d40feedd4b3ad
- https://github.com/galette/galette/security/advisories/GHSA-hw28-c7px-xqm5
