CVE-2024-41819
📋 TL;DR
Note Mark versions before 0.13.1 contain a stored cross-site scripting (XSS) vulnerability where attackers can inject malicious JavaScript into markdown links. When users view notes containing these crafted links, the attacker's code executes in their browser. All users running vulnerable versions are affected.
💻 Affected Systems
- Note Mark
📦 What is this software?
Note Mark by Enchantedcode
⚠️ Risk & Real-World Impact
Worst Case
Attackers could steal session cookies, redirect users to phishing sites, perform actions on behalf of authenticated users, or install malware via drive-by downloads.
Likely Case
Attackers with access to create or edit notes could compromise other users' sessions, steal sensitive data from notes, or deface the application.
If Mitigated
With proper input validation and output encoding, malicious scripts would be rendered harmless as plain text.
🎯 Exploit Status
Exploitation requires the ability to create or edit markdown content. The advisory includes example payloads showing how to inject JavaScript via crafted URLs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.13.1
Vendor Advisory: https://github.com/enchant97/note-mark/security/advisories/GHSA-rm48-9mqf-8jc3
Restart Required: Yes
Instructions:
1. Backup your Note Mark data and configuration. 2. Stop the Note Mark service. 3. Update to version 0.13.1 using your package manager or by downloading from GitHub. 4. Restart the Note Mark service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Disable user-generated content
allTemporarily disable note creation/editing features until patching is complete
Implement WAF rules
allAdd web application firewall rules to block JavaScript in URL parameters
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to prevent script execution
- Enable read-only mode for all notes to prevent new malicious content
🔍 How to Verify
Check if Vulnerable:
Check if your Note Mark version is below 0.13.1. Test by creating a note with a markdown link containing a JavaScript payload like [test](javascript:alert('xss')).Check Version:
Check the application interface or package manager for version informationVerify Fix Applied:
After updating to 0.13.1, test the same payload - it should be sanitized and not execute JavaScript.📡 Detection & Monitoring
Log Indicators:
- Unusual markdown link patterns with javascript: protocol
- Multiple failed attempts to inject script tags in URLs
Network Indicators:
- Requests containing javascript: in URL parameters
- Unusual outbound connections from user browsers after viewing notes
SIEM Query:
source="note-mark" AND (url="*javascript:*" OR payload="*javascript:*")🔗 References
- https://github.com/enchant97/note-mark/commit/a0997facb82f85bfb8c0d497606d89e7d150e182
- https://github.com/enchant97/note-mark/security/advisories/GHSA-rm48-9mqf-8jc3
- https://github.com/enchant97/note-mark/commit/a0997facb82f85bfb8c0d497606d89e7d150e182
- https://github.com/enchant97/note-mark/security/advisories/GHSA-rm48-9mqf-8jc3
