CVE-2025-11789
📋 TL;DR
An out-of-bounds read vulnerability in Circutor SGE-PLC1000/SGE-PLC50 allows attackers to read memory beyond intended boundaries by providing a large parameter to the 'DownloadFile' function. This affects industrial control systems using vulnerable versions of these PLC devices, potentially exposing sensitive data or causing system instability.
💻 Affected Systems
- Circutor SGE-PLC1000
- Circutor SGE-PLC50
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Memory disclosure could leak sensitive configuration data, authentication credentials, or system information, potentially enabling further attacks or causing denial of service through system crashes.
Likely Case
Information disclosure of adjacent memory contents, potentially revealing system state or configuration details that could aid attackers in reconnaissance or further exploitation.
If Mitigated
Limited impact with proper network segmentation and access controls preventing unauthorized access to the vulnerable interface.
🎯 Exploit Status
Exploitation requires network access to the vulnerable function but appears straightforward based on the vulnerability description.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.incibe.es/en/incibe-cert/notices/aviso-sci/multiple-vulnerabilities-circutor-products-0
Restart Required: Yes
Instructions:
1. Monitor vendor for firmware updates. 2. Apply vendor-provided patches when available. 3. Restart affected devices after patching.
🔧 Temporary Workarounds
Network Segmentation
allIsolate PLC devices from untrusted networks and restrict access to authorized management systems only.
Access Control Lists
allImplement firewall rules to block external access to PLC management interfaces.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate PLCs from untrusted networks
- Monitor network traffic for unusual access patterns to PLC management interfaces
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or serial console. If version is v9.0.2, device is vulnerable.Check Version:
Check via web interface at http://[device-ip]/status or via serial console using vendor-specific commandsVerify Fix Applied:
Verify firmware version has been updated to a patched version provided by the vendor.📡 Detection & Monitoring
Log Indicators:
- Unusual access to DownloadFile function
- Multiple failed parameter attempts
- System crash or restart logs
Network Indicators:
- Unusual traffic to PLC management ports
- Requests with large numeric parameters to vulnerable endpoints
SIEM Query:
source_ip=external AND dest_port=PLC_management_port AND (uri_contains="DownloadFile" OR param_value>threshold)