CVE-2024-48782
📋 TL;DR
This vulnerability allows remote attackers to upload malicious files disguised as images to execute arbitrary code on DYCMS servers. It affects all users running the open-source version of DYCMS v2.0.9.41. Attackers can bypass front-end file extension validation to upload and execute malicious code.
💻 Affected Systems
- DYCMS Open-Source Version
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to execute arbitrary commands, steal data, install backdoors, or pivot to other systems.
Likely Case
Webshell deployment leading to data theft, defacement, or use as a foothold for further attacks.
If Mitigated
Attack blocked at web application firewall or file upload validation layer with no impact.
🎯 Exploit Status
Proof-of-concept available in GitHub gist; exploitation requires only web access to upload endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Implement server-side file validation
allAdd server-side validation to check file extensions, MIME types, and content signatures before accepting uploads.
Modify upload handler to validate file magic bytes and extension server-side
Restrict upload directory permissions
linuxSet upload directory to no-execute permissions to prevent uploaded files from being executed.
chmod -R 644 /path/to/uploads
chown www-data:www-data /path/to/uploads
🧯 If You Can't Patch
- Disable file upload functionality entirely in DYCMS configuration
- Implement WAF rules to block suspicious file uploads and monitor upload endpoints
🔍 How to Verify
Check if Vulnerable:
Check if DYCMS version is v2.0.9.41 and test uploading a file with image extension but non-image content.Check Version:
Check DYCMS admin panel or configuration files for version informationVerify Fix Applied:
Test that server-side validation rejects files with mismatched extensions/content and upload directory has no-execute permissions.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with image extensions but non-image MIME types
- Files uploaded to upload directory with executable permissions
Network Indicators:
- HTTP POST requests to upload endpoints with suspicious file content
SIEM Query:
source="web_logs" AND (uri_path="/upload" OR uri_path="/admin/upload") AND (file_extension="jpg" OR file_extension="png") AND content_type!="image/*"