CVE-2020-35734
📋 TL;DR
This vulnerability allows authenticated users in Batflat CMS to inject malicious code through user profile fields, leading to remote code execution. It affects Batflat 1.3.6 installations where users have access to the administration panel. Note that this product is no longer supported by the maintainer.
💻 Affected Systems
- Batflat CMS
📦 What is this software?
Batflat by Batflat
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to execute arbitrary commands, access sensitive data, install malware, or pivot to other systems.
Likely Case
Attacker with valid credentials gains shell access, modifies website content, steals data, or installs backdoors.
If Mitigated
Limited impact if proper access controls, input validation, and monitoring are in place to detect suspicious activity.
🎯 Exploit Status
Exploit requires valid admin credentials. Multiple public exploit scripts and detailed write-ups available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None
Vendor Advisory: https://batflat.org/en/changelog
Restart Required: No
Instructions:
No official patch available as product is no longer supported. Consider migrating to supported CMS.
🔧 Temporary Workarounds
Input Validation Enhancement
allAdd server-side input validation for all user profile fields to prevent code injection.
Modify /inc/core/users.class.php to sanitize input before processing
Access Restriction
allRestrict access to administration panel to trusted IP addresses only.
Add IP whitelisting to .htaccess or web server configuration
🧯 If You Can't Patch
- Immediately change all admin passwords and implement strong password policies
- Monitor user profile modification logs and set alerts for suspicious changes
🔍 How to Verify
Check if Vulnerable:
Check if running Batflat version 1.3.6 by examining version files or admin panel footer.Check Version:
grep -r 'version' /path/to/batflat/ or check admin panel interfaceVerify Fix Applied:
Test user profile editing functionality with malicious input to ensure proper sanitization.📡 Detection & Monitoring
Log Indicators:
- Unusual user profile modifications
- Suspicious POST requests to user editing endpoints
- Execution of system commands in web logs
Network Indicators:
- Unexpected outbound connections from web server
- Shell command patterns in HTTP requests
SIEM Query:
source="web_logs" AND (uri="/admin/users/edit" OR uri="/admin/users/save") AND (payload CONTAINS "system(" OR payload CONTAINS "exec(" OR payload CONTAINS "shell_exec(")🔗 References
- http://packetstormsecurity.com/files/161457/Batflat-CMS-1.3.6-Remote-Code-Execution.html
- https://batflat.org/en/changelog
- https://github.com/sruupl/batflat/issues/98
- https://secator.pl/index.php/2021/02/15/batflat-v-1-3-6-authenticated-remote-code-execution-public-disclosure/
- http://packetstormsecurity.com/files/161457/Batflat-CMS-1.3.6-Remote-Code-Execution.html
- https://batflat.org/en/changelog
- https://github.com/sruupl/batflat/issues/98
- https://secator.pl/index.php/2021/02/15/batflat-v-1-3-6-authenticated-remote-code-execution-public-disclosure/
