CVE-2023-2686 – A buffer overflow vulnerability in the Wi-Fi Co... (How to Fix)

Q: What is the severity of CVE-2023-2686?

CVE-2023-2686 has a CVSS score of 9.8 (CRITICAL). A buffer overflow vulnerability in the Wi-Fi Commissioning example code in Silicon Labs Gecko SDK allows attackers to write arbitrary payloads onto the stack. This affects devices using Gecko SDK v4.2.3 or earlier with the vulnerable example code. Attackers could potentially execute arbitrary code or crash the system.

📋 TL;DR

A buffer overflow vulnerability in the Wi-Fi Commissioning example code in Silicon Labs Gecko SDK allows attackers to write arbitrary payloads onto the stack. This affects devices using Gecko SDK v4.2.3 or earlier with the vulnerable example code. Attackers could potentially execute arbitrary code or crash the system.

💻 Affected Systems

Products:

Silicon Labs Gecko SDK
Devices using Gecko SDK Wi-Fi Commissioning example

Versions: v4.2.3 and earlier

Operating Systems: MicriumOS

Default Config Vulnerable: ⚠️ Yes

Notes: Only affects systems using the Wi-Fi Commissioning example code from the SDK

📦 What is this software?

Gecko Software Development Kit by Silabs

View all CVEs affecting Gecko Software Development Kit →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete device compromise, data theft, or device takeover

🟠

Likely Case

Denial of service through system crashes or instability

🟢

If Mitigated

Limited impact if proper network segmentation and input validation are implemented

🌐 Internet-Facing: HIGH - Wi-Fi commissioning interfaces are often exposed to network attacks

🏢 Internal Only: MEDIUM - Requires network access but could be exploited internally

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Requires network access to Wi-Fi commissioning interface but no authentication

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Gecko SDK v4.3.0 or later

Vendor Advisory: https://community.silabs.com/sfc/servlet.shepherd/document/download/0698Y00000U2sFvQAJ

Restart Required: Yes

Instructions:

1. Update to Gecko SDK v4.3.0 or later. 2. Rebuild and redeploy firmware. 3. Restart affected devices.

🔧 Temporary Workarounds

Disable Wi-Fi Commissioning

all

Disable the vulnerable Wi-Fi Commissioning feature if not required

Modify firmware to remove Wi-Fi Commissioning example code

Network Segmentation

all

Isolate devices from untrusted networks

Configure firewall rules to restrict access to Wi-Fi commissioning ports

🧯 If You Can't Patch

Implement strict network access controls to limit exposure
Monitor for abnormal Wi-Fi commissioning traffic patterns

🔍 How to Verify

Check if Vulnerable:

Check if device uses Gecko SDK v4.2.3 or earlier with Wi-Fi Commissioning example

Check Version:

Check firmware version or SDK version in build configuration

Verify Fix Applied:

Verify Gecko SDK version is v4.3.0 or later and Wi-Fi Commissioning code is updated

📡 Detection & Monitoring

Log Indicators:

Buffer overflow errors
Wi-Fi commissioning failures
System crashes

Network Indicators:

Unusual Wi-Fi commissioning traffic
Large payloads to Wi-Fi commissioning ports

SIEM Query:

search 'Wi-Fi Commissioning' AND (buffer_overflow OR crash)

📊 Metadata

CVE ID: CVE-2023-2686

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-120

Published: June 15, 2023

Last Updated: November 21, 2024

🔗 References

https://community.silabs.com/sfc/servlet.shepherd/document/download/0698Y00000U2sFvQAJ?operationContext=S1 Permissions Required
https://github.com/SiliconLabs/gecko_sdk/releases Release Notes
https://community.silabs.com/sfc/servlet.shepherd/document/download/0698Y00000U2sFvQAJ?operationContext=S1 Permissions Required
https://github.com/SiliconLabs/gecko_sdk/releases Release Notes

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🔗 Related Vulnerabilities

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