CVE-2021-38302
📋 TL;DR
This vulnerability allows SQL injection in the Newsletter extension for TYPO3 CMS. Attackers can execute arbitrary SQL commands through the extension's input fields, potentially compromising the database. All TYPO3 installations using Newsletter extension versions through 4.0.0 are affected.
💻 Affected Systems
- TYPO3 Newsletter extension
📦 What is this software?
Newsletter by Newsletter Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, privilege escalation, and potential remote code execution through database functions.
Likely Case
Unauthorized data access, extraction of sensitive information (user credentials, personal data), and potential website defacement.
If Mitigated
Limited impact with proper input validation and database permissions, potentially only read access to non-sensitive data.
🎯 Exploit Status
SQL injection vulnerabilities are commonly exploited. Requires access to Newsletter extension functionality, which typically requires some level of authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 4.0.1 or later
Vendor Advisory: https://typo3.org/security/advisory/typo3-ext-sa-2021-014
Restart Required: No
Instructions:
1. Update the Newsletter extension to version 4.0.1 or later via TYPO3 Extension Manager. 2. Clear all caches. 3. Verify the update was successful.
🔧 Temporary Workarounds
Disable Newsletter extension
allTemporarily disable the vulnerable extension until patching is possible
typo3cms extension:deactivate newsletter
Implement WAF rules
allAdd web application firewall rules to block SQL injection patterns targeting Newsletter endpoints
🧯 If You Can't Patch
- Restrict access to Newsletter functionality to trusted users only
- Implement database-level controls: use least privilege accounts, enable query logging, and review database permissions
🔍 How to Verify
Check if Vulnerable:
Check TYPO3 Extension Manager for Newsletter extension version. If version is 4.0.0 or earlier, system is vulnerable.Check Version:
typo3cms extension:list | grep newsletterVerify Fix Applied:
Verify Newsletter extension version is 4.0.1 or later in TYPO3 Extension Manager.📡 Detection & Monitoring
Log Indicators:
- Unusual database queries from TYPO3 application
- Multiple failed login attempts through Newsletter forms
- SQL error messages in application logs
Network Indicators:
- SQL injection patterns in HTTP requests to Newsletter endpoints
- Unusual database connection patterns from web server
SIEM Query:
source="typo3.log" AND ("SQL" OR "database error" OR "newsletter")