CVE-2020-36008
📋 TL;DR
OBottle 2.0 contains an arbitrary file write vulnerability in the \c\t.php file that allows attackers to write arbitrary files to the server. This affects all users running OBottle 2.0 with the vulnerable component accessible. The vulnerability could lead to complete system compromise.
💻 Affected Systems
- OBottle
📦 What is this software?
Obottle by Obottle Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover through remote code execution by writing malicious files like web shells or system scripts.
Likely Case
Web shell deployment leading to data theft, lateral movement, and persistence on the affected server.
If Mitigated
Limited impact if file write permissions are restricted and input validation is implemented.
🎯 Exploit Status
The GitHub issue shows exploitation details; arbitrary file write vulnerabilities are commonly weaponized for RCE.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://github.com/SomeBottle/OBottle/issues/7
Restart Required: No
Instructions:
No official patch available; check GitHub for updates or apply workarounds.
🔧 Temporary Workarounds
Remove vulnerable file
allDelete or restrict access to the \c\t.php file to prevent exploitation.
rm /path/to/OBottle/\c\t.php
Implement input validation
allAdd strict input validation and sanitization in the PHP code to block malicious file writes.
🧯 If You Can't Patch
- Restrict file permissions to prevent writing to critical directories.
- Implement network segmentation and firewall rules to limit access to the vulnerable system.
🔍 How to Verify
Check if Vulnerable:
Check if \c\t.php exists in your OBottle installation and review its code for file write operations without proper validation.Check Version:
Check OBottle version in configuration files or documentation; default is 2.0 for this vulnerability.Verify Fix Applied:
Verify that \c\t.php is removed or patched, and test that arbitrary file writes are no longer possible.📡 Detection & Monitoring
Log Indicators:
- Unusual file write operations in PHP error logs, access to \c\t.php with suspicious parameters.
Network Indicators:
- HTTP requests to \c\t.php with file write parameters, unusual outbound connections post-exploitation.
SIEM Query:
Search for '\c\t.php' in web server logs with POST/PUT methods and file-related parameters.