CVE-2023-1561
📋 TL;DR
This critical vulnerability in Simple Online Hotel Reservation System 1.0 allows attackers to upload arbitrary files without restrictions via the add_room.php file. This can lead to remote code execution, potentially giving attackers full control over affected systems. Any organization using this hotel reservation software is at risk.
💻 Affected Systems
- Simple Online Hotel Reservation System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via remote code execution, allowing attackers to steal data, install malware, pivot to other systems, or disrupt hotel operations.
Likely Case
Webshell deployment leading to data theft, defacement, or use as a foothold for further attacks within the network.
If Mitigated
Limited impact with proper file upload restrictions, web application firewalls, and network segmentation in place.
🎯 Exploit Status
Proof of concept available in GitHub repository; exploitation requires only web access to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider replacing with alternative software or implementing strict workarounds.
🔧 Temporary Workarounds
Restrict File Uploads
allImplement strict file type validation and size limits on upload functionality
Disable add_room.php
linuxTemporarily disable or rename the vulnerable file
mv add_room.php add_room.php.disabled
chmod 000 add_room.php
🧯 If You Can't Patch
- Implement web application firewall with file upload restrictions
- Isolate the system in a DMZ with strict network access controls
🔍 How to Verify
Check if Vulnerable:
Check if add_room.php exists and accepts file uploads without proper validationCheck Version:
Check software version in admin panel or configuration filesVerify Fix Applied:
Test file upload functionality with malicious file types; verify they are rejected📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to add_room.php
- Execution of unexpected PHP files
- Large or suspicious file uploads
Network Indicators:
- HTTP POST requests to add_room.php with file uploads
- Unusual outbound connections from web server
SIEM Query:
source="web_logs" AND uri="/add_room.php" AND method="POST" AND size>1000000🔗 References
- https://github.com/sincere9/Bug-Hub/blob/main/SIMPLE%20ONLINE%20HOTEL%20RESERVATION%20SYSTEM/SIMPLE%20ONLINE%20HOTEL%20RESERVATION%20SYSTEM%20has%20a%20file%20upload%20(RCE)%20vulnerability.pdf
- https://vuldb.com/?ctiid.223554
- https://vuldb.com/?id.223554
- https://github.com/sincere9/Bug-Hub/blob/main/SIMPLE%20ONLINE%20HOTEL%20RESERVATION%20SYSTEM/SIMPLE%20ONLINE%20HOTEL%20RESERVATION%20SYSTEM%20has%20a%20file%20upload%20(RCE)%20vulnerability.pdf
- https://vuldb.com/?ctiid.223554
- https://vuldb.com/?id.223554
