CVE-2025-13670
📋 TL;DR
This DLL planting vulnerability in the High Level Synthesis Compiler i++ command for Windows allows attackers to execute arbitrary code by placing malicious DLLs in directories searched by the application. It affects users running the vulnerable i++ compiler on Windows systems. Successful exploitation requires the attacker to have write access to directories in the DLL search path.
💻 Affected Systems
- Intel High Level Synthesis Compiler (i++ command)
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining the same privileges as the user running i++ command, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation where an attacker with limited access can execute arbitrary code with higher privileges, potentially compromising the development environment or adjacent systems.
If Mitigated
Limited impact with proper access controls preventing unauthorized users from writing to application directories, reducing attack surface to trusted users only.
🎯 Exploit Status
Exploitation requires local access to plant DLLs in directories searched by i++. DLL planting attacks are well-understood and relatively easy to execute with appropriate access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to Intel/Altera security advisory ASA-0003 for specific patched versions
Vendor Advisory: https://www.altera.com/security/security-advisory/asa-0003
Restart Required: No
Instructions:
1. Review Intel/Altera security advisory ASA-0003. 2. Download and install the latest version of High Level Synthesis Compiler from official Intel/Altera sources. 3. Verify installation and test i++ functionality.
🔧 Temporary Workarounds
Restrict DLL search path
windowsConfigure Windows to use SafeDllSearchMode and restrict DLL search order
Set registry key: HKLM\System\CurrentControlSet\Control\Session Manager\SafeDllSearchMode = 1
Use absolute paths for DLL loading
windowsModify application configuration to use absolute paths for required DLLs
🧯 If You Can't Patch
- Implement strict file system permissions to prevent unauthorized users from writing to directories in the DLL search path
- Monitor for suspicious DLL files in application directories and use application whitelisting to control which DLLs can be loaded
🔍 How to Verify
Check if Vulnerable:
Check if you're using Intel High Level Synthesis Compiler i++ command on Windows and review version against patched releases in advisory ASA-0003Check Version:
Run 'i++ --version' or check compiler properties in installation directoryVerify Fix Applied:
Verify installed version matches or exceeds the patched version specified in Intel/Altera advisory ASA-0003📡 Detection & Monitoring
Log Indicators:
- Unexpected DLL loads from non-standard directories
- Failed DLL load attempts from suspicious locations
- Process creation events for i++ with unusual parent processes
Network Indicators:
- Outbound connections from i++ process to unexpected destinations
- DNS queries for suspicious domains from development systems
SIEM Query:
Process Creation where Image contains 'i++' AND (CommandLine contains suspicious parameters OR ParentImage is unusual)