CVE-2022-28328 – This vulnerability affects Siemens SCALANCE W17... (How to Fix)

Q: How do I fix CVE-2022-28328?

1. Download firmware V3.0.0 or later from Siemens support portal. 2. Backup current configuration. 3. Upload new firmware via web interface or management tools. 4. Reboot device. 5. Restore configuration if needed.

Q: What is the severity of CVE-2022-28328?

CVE-2022-28328 has a CVSS score of 7.5 (HIGH). This vulnerability affects Siemens SCALANCE W1788 industrial wireless access points. An attacker can send specially crafted multicast LLC frames to cause a denial of service condition, disrupting network connectivity. All versions before V3.0.0 of the specified SCALANCE W1788 models are vulnerable.

📋 TL;DR

This vulnerability affects Siemens SCALANCE W1788 industrial wireless access points. An attacker can send specially crafted multicast LLC frames to cause a denial of service condition, disrupting network connectivity. All versions before V3.0.0 of the specified SCALANCE W1788 models are vulnerable.

💻 Affected Systems

Products:

SCALANCE W1788-1 M12
SCALANCE W1788-2 EEC M12
SCALANCE W1788-2 M12
SCALANCE W1788-2IA M12

Versions: All versions < V3.0.0

Operating Systems: Embedded firmware

Default Config Vulnerable: ⚠️ Yes

Notes: All affected devices are vulnerable in default configurations when processing multicast LLC frames.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete device crash requiring physical reboot, causing extended network downtime in industrial environments.

🟠

Likely Case

Temporary service disruption affecting wireless connectivity for connected industrial devices.

🟢

If Mitigated

Minimal impact with proper network segmentation and monitoring in place.

🌐 Internet-Facing: MEDIUM - Devices exposed to internet could be targeted by remote attackers, but industrial networks often have limited internet exposure.

🏢 Internal Only: HIGH - Internal attackers or compromised devices on the same network segment can easily exploit this vulnerability.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires network access to send malformed multicast frames, but no authentication is needed.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: V3.0.0 or later

Vendor Advisory: https://cert-portal.siemens.com/productcert/pdf/ssa-392912.pdf

Restart Required: Yes

Instructions:

1. Download firmware V3.0.0 or later from Siemens support portal. 2. Backup current configuration. 3. Upload new firmware via web interface or management tools. 4. Reboot device. 5. Restore configuration if needed.

🔧 Temporary Workarounds

Network segmentation

all

Isolate SCALANCE devices on separate VLANs to limit exposure to potential attackers.

Multicast filtering

all

Configure network switches to filter or rate-limit multicast traffic to affected devices.

🧯 If You Can't Patch

Implement strict network access controls to limit who can send traffic to affected devices.
Deploy network monitoring to detect abnormal multicast traffic patterns.

🔍 How to Verify

Check if Vulnerable:

Check device firmware version via web interface or CLI. If version is below V3.0.0, device is vulnerable.

Check Version:

Check via web interface: System > Device Information, or via CLI: show version

Verify Fix Applied:

Confirm firmware version is V3.0.0 or higher after update.

📡 Detection & Monitoring

Log Indicators:

Device reboot logs without normal shutdown
Increased error logs related to frame processing

Network Indicators:

Spike in multicast traffic to affected devices
Unusual LLC frame patterns

SIEM Query:

source="scalance" AND (event_type="reboot" OR error="frame")

📊 Metadata

CVE ID: CVE-2022-28328

CVSS v3 Score: 7.5 (HIGH)

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

CWE: CWE-20

Published: April 12, 2022

Last Updated: November 21, 2024

🔗 References

https://cert-portal.siemens.com/productcert/pdf/ssa-392912.pdf Patch,Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-392912.pdf Patch,Vendor Advisory

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