CVE-2013-10040
📋 TL;DR
CVE-2013-10040 is an unauthenticated arbitrary file upload vulnerability in ClipBucket versions 2.6 and earlier. Attackers can upload PHP scripts via the /admin_area/charts/ofc-library/ofc_upload_image.php endpoint and execute them remotely, leading to complete server compromise. All ClipBucket installations using vulnerable versions are affected.
💻 Affected Systems
- ClipBucket
📦 What is this software?
Clipbucket by Clip Bucket
⚠️ Risk & Real-World Impact
Worst Case
Complete server takeover with attacker gaining root/system-level access, data exfiltration, ransomware deployment, and persistent backdoor installation.
Likely Case
Webshell deployment leading to data theft, defacement, cryptocurrency mining, or use as a pivot point for internal network attacks.
If Mitigated
Attack fails due to proper file upload validation, web application firewall rules, or network segmentation preventing access to vulnerable endpoint.
🎯 Exploit Status
Metasploit module available (clipbucket_upload_exec.rb) and multiple public proof-of-concept scripts exist. Exploitation requires only HTTP POST requests.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.7 and later
Vendor Advisory: https://clipbucket.com/
Restart Required: No
Instructions:
1. Backup your ClipBucket installation and database. 2. Download the latest version from the official ClipBucket website. 3. Replace all files except configuration files and uploaded content. 4. Verify the /admin_area/charts/ofc-library/ofc_upload_image.php file has proper authentication checks.
🔧 Temporary Workarounds
Delete vulnerable script
linuxRemove or rename the vulnerable PHP file to prevent exploitation
rm /path/to/clipbucket/admin_area/charts/ofc-library/ofc_upload_image.php
Restrict access via .htaccess
linuxBlock all access to the vulnerable directory using Apache mod_auth
Order Deny,Allow
Deny from all
🧯 If You Can't Patch
- Implement strict web application firewall rules to block requests to /admin_area/charts/ofc-library/ofc_upload_image.php
- Move ClipBucket installation behind authentication proxy requiring valid credentials before accessing any admin paths
🔍 How to Verify
Check if Vulnerable:
Check if file exists at /admin_area/charts/ofc-library/ofc_upload_image.php and test uploading a file without authentication using curl: curl -X POST -F 'Filedata=@test.php' http://target/admin_area/charts/ofc-library/ofc_upload_image.phpCheck Version:
grep -r 'ClipBucket Version' /path/to/clipbucket/includes/ || cat /path/to/clipbucket/includes/version.phpVerify Fix Applied:
Attempt the same upload test after patching - should receive authentication error or file type validation error. Verify version is 2.7 or higher.📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /admin_area/charts/ofc-library/ofc_upload_image.php
- File uploads with .php extension in web logs
- Unusual file creation in upload directories
Network Indicators:
- POST requests to vulnerable path without referer or user-agent
- Multiple rapid upload attempts
- Subsequent requests to newly created .php files
SIEM Query:
source="web_logs" AND (uri_path="/admin_area/charts/ofc-library/ofc_upload_image.php" OR file_extension=".php") AND http_method="POST"🔗 References
- https://clipbucket.com/
- https://github.com/arslancb/clipbucket
- https://packetstorm.news/files/id/123480
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/unix/webapp/clipbucket_upload_exec.rb
- https://www.vulncheck.com/advisories/clipbucket-arbitrary-file-upload-rce
