CVE-2023-2551
📋 TL;DR
This CVE describes a PHP Remote File Inclusion vulnerability in the bumsys software that allows attackers to include and execute arbitrary remote files. Attackers can exploit this to execute malicious code on affected systems. Users running bumsys versions prior to 2.1.1 are affected.
💻 Affected Systems
- bumsys
📦 What is this software?
Bumsys by Bumsys Project
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise leading to remote code execution, data theft, and complete control over the affected server.
Likely Case
Arbitrary code execution leading to web shell installation, data exfiltration, and lateral movement within the network.
If Mitigated
Limited impact if proper web application firewalls and input validation are in place, potentially blocking malicious requests.
🎯 Exploit Status
Exploit details are publicly available in the huntr.dev bounty report and GitHub commit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.1.1
Vendor Advisory: https://github.com/unilogies/bumsys/commit/86e29dd23df348ec6075f0c0de8e06b8d9fb0a9a
Restart Required: No
Instructions:
1. Update bumsys to version 2.1.1 or later. 2. Replace vulnerable files with patched versions from the GitHub commit. 3. Verify the fix by testing file inclusion functionality.
🔧 Temporary Workarounds
Disable allow_url_include
allDisable PHP's allow_url_include setting to prevent remote file inclusion.
php.ini: allow_url_include = Off
Web Application Firewall Rules
allImplement WAF rules to block requests containing remote file inclusion patterns.
🧯 If You Can't Patch
- Implement strict input validation and sanitization for all file inclusion parameters.
- Deploy network segmentation to isolate the vulnerable system from critical assets.
🔍 How to Verify
Check if Vulnerable:
Check if bumsys version is below 2.1.1 and review code for unsafe file inclusion functions like include(), require() with user input.Check Version:
Check bumsys documentation or configuration files for version information.Verify Fix Applied:
Verify the installation is version 2.1.1 or later and test file inclusion functionality with controlled inputs.📡 Detection & Monitoring
Log Indicators:
- Unusual file inclusion attempts in web server logs
- Requests containing remote URLs in file inclusion parameters
- Multiple failed inclusion attempts from single IPs
Network Indicators:
- HTTP requests with remote file paths in parameters
- Outbound connections to unexpected domains following inclusion attempts
SIEM Query:
web_server_logs | where url contains "include" or url contains "require" | where url contains "http://" or url contains "https://"