CVE-2025-3484
📋 TL;DR
This critical vulnerability in MedDream PACS Server allows remote attackers to execute arbitrary code without authentication by sending specially crafted DICOM files. The stack-based buffer overflow occurs during DICOM file parsing due to insufficient length validation. All organizations using vulnerable versions of MedDream PACS Server are affected.
💻 Affected Systems
- MedDream PACS Server
📦 What is this software?
Pacs Server by Meddream
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining service account privileges, enabling data theft, ransomware deployment, lateral movement, and persistent backdoor installation.
Likely Case
Remote code execution leading to data exfiltration of medical imaging data, system disruption, and potential compliance violations (HIPAA, GDPR).
If Mitigated
Limited impact with proper network segmentation and monitoring, potentially only service disruption if exploitation attempts are detected and blocked.
🎯 Exploit Status
No authentication required, simple buffer overflow with predictable exploitation path. ZDI has confirmed the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for specific patched version
Vendor Advisory: https://www.zerodayinitiative.com/advisories/ZDI-25-242/
Restart Required: Yes
Instructions:
1. Check MedDream vendor website for security advisory
2. Download and apply the latest security patch
3. Restart the MedDream PACS Server service
4. Verify the patch is applied successfully
🔧 Temporary Workarounds
Network Segmentation
allIsolate MedDream PACS Server from untrusted networks and internet
DICOM File Filtering
allImplement network filtering or WAF rules to block suspicious DICOM files
🧯 If You Can't Patch
- Implement strict network access controls to limit DICOM traffic to trusted sources only
- Deploy intrusion detection systems to monitor for buffer overflow attempts and DICOM file anomalies
🔍 How to Verify
Check if Vulnerable:
Check MedDream PACS Server version against vendor's patched version listCheck Version:
Check MedDream administration interface or installation directory for version informationVerify Fix Applied:
Verify the installed version matches or exceeds the patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual DICOM file processing errors
- Service crashes or restarts
- Large or malformed DICOM file uploads
Network Indicators:
- Unusual DICOM traffic patterns
- DICOM files with abnormal structure or size
- Connection attempts from unexpected sources
SIEM Query:
source="meddream" AND (event_type="crash" OR error_message="buffer" OR file_size>threshold)