CVE-2023-26857
📋 TL;DR
This vulnerability allows attackers to upload arbitrary PHP files to the Dynamic Transaction Queuing System v1.0 through the /admin/ajax.php endpoint. Attackers can then execute malicious code on the server, potentially gaining full control. Organizations running this specific software version are affected.
💻 Affected Systems
- Dynamic Transaction Queuing System
📦 What is this software?
Dynamic Transaction Queuing System by Dynamic Transaction Queuing System Project
View all CVEs affecting Dynamic Transaction Queuing System →
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, ransomware deployment, or use as a foothold for lateral movement within the network.
Likely Case
Webshell installation allowing persistent backdoor access, data exfiltration, and further exploitation of the server.
If Mitigated
Limited impact with proper file upload validation and web application firewalls blocking malicious uploads.
🎯 Exploit Status
Exploitation requires crafting a PHP file and uploading it via the vulnerable endpoint. Public proof-of-concept exists in GitHub references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
No official patch available. Consider workarounds or replacing the software.
🔧 Temporary Workarounds
Restrict File Uploads
allImplement strict file upload validation to only allow specific file types and extensions.
Modify /admin/ajax.php to validate file extensions and MIME types before saving.
Disable Vulnerable Endpoint
allTemporarily disable or restrict access to the /admin/ajax.php endpoint.
Add authentication check or IP restriction to /admin/ajax.php
Rename or move the vulnerable file
🧯 If You Can't Patch
- Implement a Web Application Firewall (WAF) with rules to block malicious file uploads.
- Restrict network access to the admin interface and monitor for unauthorized upload attempts.
🔍 How to Verify
Check if Vulnerable:
Attempt to upload a PHP file via /admin/ajax.php?action=save_uploads and check if it executes.Check Version:
Check software documentation or configuration files for version information.Verify Fix Applied:
Test that PHP file uploads are blocked or properly validated by the endpoint.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /admin/ajax.php
- PHP file creation in upload directories
- Suspicious POST requests with file content
Network Indicators:
- HTTP POST requests to /admin/ajax.php with file uploads
- Traffic patterns indicating webshell communication
SIEM Query:
source="web_logs" AND uri="/admin/ajax.php" AND method="POST" AND (file_extension="php" OR content_type="application/x-php")