CVE-2021-26830
📋 TL;DR
This SQL injection vulnerability in Zenario CMS allows remote attackers to execute arbitrary SQL commands through the ID parameter in the plugin deletion module. Attackers can potentially access, modify, or delete database contents, including deleting plugins. All Zenario CMS users running affected versions are at risk.
💻 Affected Systems
- TribalSystems Zenario CMS
📦 What is this software?
Zenario by Tribalsystems
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, or full system takeover via subsequent attacks.
Likely Case
Database information disclosure, plugin deletion causing site functionality loss, or limited data manipulation.
If Mitigated
Attack blocked at web application firewall level with minimal impact if proper input validation is in place.
🎯 Exploit Status
SQL injection via ID parameter requires authentication but is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.8.53370
Vendor Advisory: https://github.com/TribalSystems/Zenario/releases/tag/8.8.53370
Restart Required: No
Instructions:
1. Backup your Zenario installation and database. 2. Download version 8.8.53370 or later from the official repository. 3. Replace affected files with patched versions. 4. Verify the patch is applied correctly.
🔧 Temporary Workarounds
Input Validation Filter
allAdd server-side validation to sanitize ID parameter inputs in ajax.php
Modify ajax.php to validate ID parameter as integer before processing
WAF Rule
allImplement web application firewall rules to block SQL injection patterns
Add WAF rule to detect and block SQL injection attempts in ID parameter
🧯 If You Can't Patch
- Disable or restrict access to the plugin library module
- Implement strict network segmentation and limit database access from web servers
🔍 How to Verify
Check if Vulnerable:
Check if Zenario version is 8.8.52729 or earlier and plugin library module is activeCheck Version:
Check Zenario admin panel or version.txt file in installation directoryVerify Fix Applied:
Verify installation is running version 8.8.53370 or later📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in database logs
- Multiple failed plugin deletion attempts
- Suspicious ID parameter values in web server logs
Network Indicators:
- SQL error messages in HTTP responses
- Unusual database connection patterns from web server
SIEM Query:
source="web_logs" AND (uri="*ajax.php*" AND param="*ID=*' OR *" OR param="*ID=*;*" OR param="*ID=*--*")