CVE-2025-6843
📋 TL;DR
CVE-2025-6843 is a critical unrestricted file upload vulnerability in Simple Photo Gallery 1.0 that allows remote attackers to upload arbitrary files to the server via the /upload-photo.php endpoint. This affects all users running Simple Photo Gallery 1.0 with the vulnerable upload functionality enabled.
💻 Affected Systems
- Simple Photo Gallery
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through webshell upload leading to remote code execution, data theft, and lateral movement within the network.
Likely Case
Webshell deployment allowing attackers to execute arbitrary commands, deface websites, or establish persistent backdoors.
If Mitigated
File uploads blocked or properly validated, preventing malicious file execution while maintaining legitimate functionality.
🎯 Exploit Status
Proof of concept is publicly available on GitHub, making exploitation trivial for attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://code-projects.org/
Restart Required: No
Instructions:
No official patch available. Consider workarounds or migrating to alternative software.
🔧 Temporary Workarounds
Disable upload-photo.php
linuxRemove or rename the vulnerable upload-photo.php file to prevent exploitation.
mv /path/to/upload-photo.php /path/to/upload-photo.php.disabled
chmod 000 /path/to/upload-photo.php
Implement file upload validation
allAdd server-side validation to restrict file types, extensions, and content.
🧯 If You Can't Patch
- Implement web application firewall (WAF) rules to block requests to upload-photo.php
- Restrict network access to the application using firewall rules or network segmentation
🔍 How to Verify
Check if Vulnerable:
Check if upload-photo.php exists and accepts file uploads without proper validation.Check Version:
Check application documentation or configuration files for version information.Verify Fix Applied:
Test that upload-photo.php is inaccessible or properly validates file uploads.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to upload-photo.php
- POST requests with suspicious file extensions
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to /upload-photo.php with executable file extensions
- Unusual outbound connections from web server
SIEM Query:
source="web_logs" AND uri="/upload-photo.php" AND (file_extension="php" OR file_extension="jsp" OR file_extension="asp")