CVE-2024-24956
📋 TL;DR
This CVE describes an out-of-bounds write vulnerability in AutomationDirect P3-550E programming software that allows remote attackers to cause heap-based memory corruption by sending specially crafted network packets. The vulnerability can lead to arbitrary null-byte writes at a specific memory offset, potentially resulting in denial of service or remote code execution. Organizations using AutomationDirect P3-550E devices with firmware version 1.2.10.9 are affected.
💻 Affected Systems
- AutomationDirect P3-550E
📦 What is this software?
P3 550e Firmware by Automationdirect
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete device compromise, data exfiltration, or lateral movement within industrial control networks.
Likely Case
Denial of service causing device crashes and disruption of industrial processes, potentially requiring physical intervention to restore functionality.
If Mitigated
Limited impact if devices are isolated in segmented networks with strict firewall rules blocking unnecessary traffic.
🎯 Exploit Status
Exploitation requires crafting specific network packets but no authentication is needed. The vulnerability is well-documented with specific offset information (0xb6a38).
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Monitor AutomationDirect security advisories for patch availability. 2. When patch is released, download from official vendor portal. 3. Apply firmware update following vendor documentation. 4. Restart device to complete installation.
🔧 Temporary Workarounds
Network Segmentation
allIsolate P3-550E devices in dedicated network segments with strict firewall rules
Access Control Lists
allImplement network ACLs to restrict access to P3-550E devices to authorized IP addresses only
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to isolate affected devices from untrusted networks
- Monitor network traffic for anomalous patterns and implement intrusion detection systems for the specific device communication protocols
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or serial console. If version is 1.2.10.9, device is vulnerable.Check Version:
Check via device web interface or use vendor-specific CLI commands if availableVerify Fix Applied:
After applying any future patch, verify firmware version has changed from 1.2.10.9 to a newer version.📡 Detection & Monitoring
Log Indicators:
- Device crash logs
- Memory corruption errors in system logs
- Unexpected device restarts
Network Indicators:
- Unusual network traffic patterns to port 502 (Modbus) or other industrial protocol ports
- Malformed packets targeting the FileSystem API
SIEM Query:
source="p3-550e" AND (event_type="crash" OR event_type="memory_error" OR event_type="unexpected_restart")