CVE-2022-28101
📋 TL;DR
Turtlapp Turtle Note v0.7.2.6 has an HTML injection vulnerability where attackers can inject malicious <meta> tags during markdown parsing. This allows attackers to execute arbitrary HTML in the context of the application, potentially affecting all users who view malicious notes. The vulnerability stems from insufficient input filtering in the markdown parser.
💻 Affected Systems
- Turtlapp Turtle Note
📦 What is this software?
Turtl by Lyonbros
Turtl by Lyonbros
⚠️ Risk & Real-World Impact
Worst Case
Attackers could execute cross-site scripting (XSS) attacks, steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users.
Likely Case
Attackers inject malicious HTML content that appears in user notes, potentially leading to phishing attacks, session hijacking, or defacement of note content.
If Mitigated
With proper input validation and output encoding, the injected HTML would be rendered as plain text rather than executed as code.
🎯 Exploit Status
Exploitation requires the ability to create or edit notes, but the HTML injection technique is simple and well-documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v0.7.2.7 or later
Vendor Advisory: https://github.com/turtl/tracker/issues/404
Restart Required: Yes
Instructions:
1. Download the latest version from the official Turtl repository. 2. Backup your existing installation. 3. Install the updated version. 4. Restart the Turtl service or application.
🔧 Temporary Workarounds
Disable markdown parsing
allTemporarily disable markdown parsing in Turtl configuration to prevent HTML injection through markdown.
Modify Turtl configuration to set markdown_parsing = false
Content filtering proxy
allDeploy a web application firewall or proxy that filters <meta> tags and other HTML injection attempts.
🧯 If You Can't Patch
- Implement strict input validation to filter <meta> tags and other HTML elements in user content
- Enable Content Security Policy (CSP) headers to restrict script execution
🔍 How to Verify
Check if Vulnerable:
Check if Turtl version is exactly v0.7.2.6. Attempt to create a note containing <meta> tags in markdown and see if they render as HTML.Check Version:
Check Turtl application settings or about page for version informationVerify Fix Applied:
After updating, test that <meta> tags in markdown are properly escaped and displayed as text rather than executed as HTML.📡 Detection & Monitoring
Log Indicators:
- Unusual note creation/editing patterns
- Log entries containing <meta> tags in user content
Network Indicators:
- HTTP requests containing <meta> tags in POST data to note endpoints
SIEM Query:
source="turtl_logs" AND ("<meta" OR "html injection")