CVE-2023-2262

Q: What is the severity of CVE-2023-2262?

CVE-2023-2262 has a CVSS score of 9.8 (CRITICAL). A buffer overflow vulnerability in Rockwell Automation 1756-EN* communication devices allows remote code execution via malicious CIP requests. This affects industrial control systems using these specific communication modules. Successful exploitation could give attackers control over critical industrial equipment.

9.8 CRITICAL

Remote Code Execution Buffer Overflow

📋 TL;DR

A buffer overflow vulnerability in Rockwell Automation 1756-EN* communication devices allows remote code execution via malicious CIP requests. This affects industrial control systems using these specific communication modules. Successful exploitation could give attackers control over critical industrial equipment.

💻 Affected Systems

Products:

Rockwell Automation 1756-EN2T
1756-EN2TR
1756-EN2TP
1756-EN2TRXT
1756-EN2TPXT
1756-EN2F
1756-EN2TRF
1756-EN2TPF
1756-EN2TRXTK
1756-EN2TPXTK

Versions: All versions prior to firmware version 6.011

Operating Systems: Embedded firmware on communication modules

Default Config Vulnerable: ⚠️ Yes

Notes: Affects specific 1756-EN* series communication modules used in ControlLogix systems

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete compromise of industrial control systems leading to physical damage, production shutdown, or safety incidents

🟠

Likely Case

Unauthorized access to industrial networks, data exfiltration, or disruption of manufacturing processes

🟢

If Mitigated

Limited impact if network segmentation and access controls prevent malicious traffic from reaching devices

🌐 Internet-Facing: HIGH - Devices exposed to internet are directly vulnerable to remote exploitation

🏢 Internal Only: HIGH - Internal attackers or compromised internal systems can exploit this vulnerability

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires sending specially crafted CIP requests to vulnerable devices

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Firmware version 6.011

Vendor Advisory: https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1140786

Restart Required: Yes

Instructions:

1. Download firmware version 6.011 from Rockwell Automation website. 2. Use ControlFLASH or Studio 5000 Logix Designer to update firmware. 3. Restart affected devices after firmware update.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate affected devices in separate network segments with strict firewall rules

CIP Traffic Filtering

all

Implement firewall rules to block unnecessary CIP traffic to vulnerable devices

🧯 If You Can't Patch

Implement strict network segmentation to isolate affected devices
Deploy intrusion detection systems to monitor for malicious CIP traffic

🔍 How to Verify

Check if Vulnerable:

Check firmware version on 1756-EN* devices using Studio 5000 Logix Designer or RSLinx Classic

Check Version:

Use Studio 5000 Logix Designer: Right-click module > Properties > Module Info

Verify Fix Applied:

Verify firmware version shows 6.011 or higher after update

📡 Detection & Monitoring

Log Indicators:

Unusual CIP protocol traffic patterns
Multiple failed CIP connection attempts
Unexpected firmware modification attempts

Network Indicators:

Malformed CIP packets to port 44818
Unusual CIP service requests
Traffic from unauthorized sources to industrial network segments

SIEM Query:

source_port:44818 AND (protocol:CIP OR service:cip) AND (malformed_packet:true OR buffer_overflow_attempt:true)

📊 Metadata

CVE ID: CVE-2023-2262

CVSS v3 Score: 9.8 (CRITICAL)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-121

Published: September 20, 2023

Last Updated: November 21, 2024

🔗 References

https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1140786 Permissions Required,Vendor Advisory
https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1140786 Permissions Required,Vendor Advisory

📋 TL;DR

💻 Affected Systems

📦 What is this software?

1756 En2f Series A Firmware by Rockwellautomation

1756 En2f Series B Firmware by Rockwellautomation

1756 En2f Series C Firmware by Rockwellautomation

1756 En2fk Series A Firmware by Rockwellautomation

1756 En2fk Series B Firmware by Rockwellautomation

1756 En2fk Series C Firmware by Rockwellautomation

1756 En2t Series A Firmware by Rockwellautomation

1756 En2t Series B Firmware by Rockwellautomation

1756 En2t Series C Firmware by Rockwellautomation

1756 En2t Series D Firmware by Rockwellautomation

1756 En2tk Series A Firmware by Rockwellautomation

1756 En2tk Series B Firmware by Rockwellautomation

1756 En2tk Series C Firmware by Rockwellautomation

1756 En2tp Series A Firmware by Rockwellautomation

1756 En2tpk Series A Firmware by Rockwellautomation

1756 En2tpxt Series A Firmware by Rockwellautomation

1756 En2tr Series A Firmware by Rockwellautomation

1756 En2tr Series B Firmware by Rockwellautomation

1756 En2tr Series C Firmware by Rockwellautomation

1756 En2trk Series A Firmware by Rockwellautomation

1756 En2trk Series B Firmware by Rockwellautomation

1756 En2trk Series C Firmware by Rockwellautomation

1756 En2trxt Series A Firmware by Rockwellautomation

1756 En2trxt Series B Firmware by Rockwellautomation

1756 En2trxt Series C Firmware by Rockwellautomation

1756 En2txt Series A Firmware by Rockwellautomation

1756 En2txt Series B Firmware by Rockwellautomation

1756 En2txt Series C Firmware by Rockwellautomation

1756 En2txt Series D Firmware by Rockwellautomation

1756 En3tr Series A Firmware by Rockwellautomation

1756 En3tr Series B Firmware by Rockwellautomation

1756 En3trk Series A Firmware by Rockwellautomation

1756 En3trk Series B Firmware by Rockwellautomation