CVE-2022-43376 – This cross-site scripting (XSS) vulnerability i... (How to Fix)

Q: What is the severity of CVE-2022-43376?

CVE-2022-43376 has a CVSS score of 7.6 (HIGH). This cross-site scripting (XSS) vulnerability in NetBotz 4 environmental monitoring devices allows attackers to inject malicious scripts into web pages. When exploited, it could enable session hijacking, credential theft, or device manipulation. All NetBotz 4 models running firmware version 4.7.0 or earlier are affected.

📋 TL;DR

This cross-site scripting (XSS) vulnerability in NetBotz 4 environmental monitoring devices allows attackers to inject malicious scripts into web pages. When exploited, it could enable session hijacking, credential theft, or device manipulation. All NetBotz 4 models running firmware version 4.7.0 or earlier are affected.

💻 Affected Systems

Products:

NetBotz 4 - 355
NetBotz 4 - 450
NetBotz 4 - 455
NetBotz 4 - 550
NetBotz 4 - 570

Versions: V4.7.0 and prior

Operating Systems: Embedded firmware

Default Config Vulnerable: ⚠️ Yes

Notes: All default configurations of affected firmware versions are vulnerable

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete device compromise allowing attacker to steal admin credentials, manipulate device settings, or pivot to internal networks

🟠

Likely Case

Session hijacking leading to unauthorized access to device management interface

🟢

If Mitigated

Limited impact if proper network segmentation and web application firewalls are in place

🌐 Internet-Facing: HIGH - Web interface accessible from internet could allow remote exploitation

🏢 Internal Only: MEDIUM - Requires attacker to have network access or trick authenticated user

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: LOW

XSS vulnerabilities typically require user interaction or authenticated access to exploit

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: V4.7.1 or later

Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2022-312-01&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2022-312-01-NetBotz_4_Security_Notification.pdf

Restart Required: Yes

Instructions:

1. Download firmware update from Schneider Electric portal. 2. Backup current configuration. 3. Apply firmware update via web interface. 4. Reboot device. 5. Verify version is V4.7.1 or later.

🔧 Temporary Workarounds

Network Segmentation

all

Restrict access to NetBotz web interface to trusted networks only

Web Application Firewall

all

Deploy WAF with XSS protection rules in front of NetBotz devices

🧯 If You Can't Patch

Implement strict network access controls to limit who can reach the web interface
Use browser security extensions that block XSS payloads for all users accessing the interface

🔍 How to Verify

Check if Vulnerable:

Check firmware version in web interface under System > About. If version is 4.7.0 or earlier, device is vulnerable.

Check Version:

No CLI command - check via web interface at System > About

Verify Fix Applied:

After patching, verify firmware version shows 4.7.1 or later in System > About page.

📡 Detection & Monitoring

Log Indicators:

Unusual HTTP requests with script tags or JavaScript payloads
Multiple failed login attempts followed by successful login from different IP

Network Indicators:

HTTP traffic containing suspicious script injection patterns
Unexpected outbound connections from NetBotz device

SIEM Query:

source="netbotz" AND (http_uri="*<script*" OR http_uri="*javascript:*" OR http_uri="*onload=*" OR http_uri="*onerror=*")

📊 Metadata

CVE ID: CVE-2022-43376

CVSS v3 Score: 7.6 (HIGH)

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

CWE: CWE-79

Published: April 18, 2023

Last Updated: November 21, 2024

🔗 References

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