CVE-2023-5036
📋 TL;DR
This CSRF vulnerability in the memos application allows attackers to trick authenticated users into performing unintended actions by crafting malicious requests. It affects all users running memos versions prior to 0.15.1 who are authenticated to the application.
💻 Affected Systems
- usememos/memos
📦 What is this software?
Memos by Usememos
⚠️ Risk & Real-World Impact
Worst Case
Attackers could create, modify, or delete memos, change user settings, or perform administrative actions on behalf of authenticated users without their consent.
Likely Case
Attackers could create or modify memos, potentially injecting malicious content or disrupting legitimate user workflows.
If Mitigated
With proper CSRF protections, all cross-origin requests would be blocked, preventing exploitation entirely.
🎯 Exploit Status
CSRF attacks are well-understood and easy to implement; exploitation requires the victim to be authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.15.1
Vendor Advisory: https://github.com/usememos/memos/commit/97b434722cf0abe3cfcad5ac9e3d520233bf1536
Restart Required: Yes
Instructions:
1. Backup your memos data. 2. Stop the memos service. 3. Update to version 0.15.1 or later. 4. Restart the memos service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Implement CSRF tokens manually
allAdd CSRF token validation to all state-changing endpoints
Use SameSite cookies
allConfigure session cookies with SameSite=Strict attribute
🧯 If You Can't Patch
- Implement a reverse proxy with CSRF protection
- Restrict access to memos to trusted networks only
🔍 How to Verify
Check if Vulnerable:
Check if running memos version earlier than 0.15.1Check Version:
Check memos web interface settings or docker container versionVerify Fix Applied:
Confirm version is 0.15.1 or later and test CSRF protection📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests from unexpected origins
- Multiple failed state-changing operations
Network Indicators:
- Cross-origin POST requests without CSRF tokens
- Requests with mismatched Origin/Referer headers
SIEM Query:
web_requests WHERE (method = 'POST' AND origin != referer) AND (path CONTAINS '/api/' OR path CONTAINS '/memos/')