CVE-2020-35337
📋 TL;DR
CVE-2020-35337 is a SQL injection vulnerability in ThinkSAAS CMS that allows authenticated attackers to execute arbitrary SQL commands via the title parameter in the admin topic management interface. This affects ThinkSAAS installations before version 3.38. Attackers with admin access can potentially compromise the database and underlying server.
💻 Affected Systems
- ThinkSAAS
📦 What is this software?
Thinksaas by Thinksaas
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, privilege escalation, and potential remote code execution on the underlying server through database functions.
Likely Case
Database information disclosure, data manipulation, and potential administrative account takeover.
If Mitigated
Limited impact with proper input validation and parameterized queries in place.
🎯 Exploit Status
Exploitation requires admin credentials but SQL injection is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 3.38
Vendor Advisory: https://github.com/thinksaas/ThinkSAAS/issues/24
Restart Required: No
Instructions:
1. Download ThinkSAAS version 3.38 or later from official sources. 2. Backup current installation and database. 3. Replace vulnerable files with patched version. 4. Verify functionality.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to sanitize title parameter input
Modify app/topic/action/admin/topic.php to validate/sanitize title parameter before SQL execution
WAF Rule
allImplement web application firewall rules to block SQL injection patterns
Add WAF rule to detect and block SQL injection attempts in POST parameters
🧯 If You Can't Patch
- Restrict access to admin interface to trusted IP addresses only
- Implement database user with minimal privileges for the application
🔍 How to Verify
Check if Vulnerable:
Check ThinkSAAS version in admin panel or by examining source files. If version < 3.38, system is vulnerable.Check Version:
Check admin panel or examine ThinkSAAS configuration files for version informationVerify Fix Applied:
Verify version is 3.38 or later and test title parameter with SQL injection payloads that should be blocked.📡 Detection & Monitoring
Log Indicators:
- SQL error messages in application logs
- Unusual database queries from admin interface
- Multiple failed login attempts followed by SQL injection patterns
Network Indicators:
- POST requests to /app/topic/action/admin/topic.php with SQL keywords in parameters
- Unusual database connection patterns
SIEM Query:
source="web_logs" AND uri="/app/topic/action/admin/topic.php" AND (title CONTAINS "UNION" OR title CONTAINS "SELECT" OR title CONTAINS "INSERT" OR title CONTAINS "DELETE")