CVE-2025-59300
📋 TL;DR
Delta Electronics DIAScreen has a file parsing vulnerability that allows out-of-bounds write when processing malicious files. This enables attackers to execute arbitrary code with the privileges of the current user. Organizations using DIAScreen for industrial control system visualization are affected.
💻 Affected Systems
- Delta Electronics DIAScreen
📦 What is this software?
Diascreen by Deltaww
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the DIAScreen workstation leading to industrial control system manipulation, data theft, or ransomware deployment in critical infrastructure environments.
Likely Case
Local privilege escalation leading to lateral movement within OT networks, potentially disrupting industrial processes or stealing proprietary operational data.
If Mitigated
Limited impact if proper network segmentation and application whitelisting prevent malicious file execution and lateral movement.
🎯 Exploit Status
Requires user interaction to open malicious file. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Version with security update as specified in Delta advisory PCSA-2025-00018
Vendor Advisory: https://filecenter.deltaww.com/news/download/doc/Delta-PCSA-2025-00018_DIAScreen%20File%20Parsing%20Out-Of-Bounds%20Write%20Vulnerability.pdf
Restart Required: Yes
Instructions:
1. Download the security update from Delta Electronics support portal. 2. Backup current DIAScreen configuration. 3. Install the update following vendor instructions. 4. Restart the system. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict File Processing
windowsConfigure DIAScreen to only process files from trusted sources and implement file extension filtering.
Application Whitelisting
windowsImplement application control policies to prevent execution of unauthorized files or scripts.
Using Windows AppLocker or similar: New-AppLockerPolicy -RuleType Path,Publisher,Hash -User Everyone -FilePath 'C:\Program Files\Delta\DIAScreen\*' -Action Allow
🧯 If You Can't Patch
- Implement strict network segmentation to isolate DIAScreen systems from untrusted networks.
- Deploy endpoint detection and response (EDR) solutions with behavioral monitoring for file parsing anomalies.
🔍 How to Verify
Check if Vulnerable:
Check DIAScreen version against the patched version in Delta advisory PCSA-2025-00018. If running older version, system is vulnerable.Check Version:
Check DIAScreen 'About' dialog or examine installed programs in Windows Control Panel for version information.Verify Fix Applied:
Verify DIAScreen version matches or exceeds the patched version specified in the vendor advisory. Test with known safe files to ensure proper parsing.📡 Detection & Monitoring
Log Indicators:
- Unusual file parsing errors in DIAScreen logs
- Multiple failed file open attempts from unusual sources
- Process creation anomalies following file operations
Network Indicators:
- Unexpected outbound connections from DIAScreen workstations
- File transfers to/from DIAScreen systems from untrusted sources
SIEM Query:
source="DIAScreen" AND (event_type="file_error" OR event_type="process_create") | stats count by src_ip, file_name