CVE-2023-30762 – This CVE describes an improper authentication v... (How to Fix)

Q: What is the severity of CVE-2023-30762?

CVE-2023-30762 has a CVSS score of 9.8 (CRITICAL). This CVE describes an improper authentication vulnerability in KB-AHR and KB-IRIP series devices that allows attackers to bypass authentication mechanisms. If exploited, it enables arbitrary OS command execution or unauthorized device configuration changes. Affected users include organizations using vulnerable versions of these specific KB Device products.

📋 TL;DR

This CVE describes an improper authentication vulnerability in KB-AHR and KB-IRIP series devices that allows attackers to bypass authentication mechanisms. If exploited, it enables arbitrary OS command execution or unauthorized device configuration changes. Affected users include organizations using vulnerable versions of these specific KB Device products.

💻 Affected Systems

Products:

KB-AHR04D
KB-AHR08D
KB-AHR16D
KB-IRIP04A
KB-IRIP08A
KB-IRIP16A

Versions: Prior to 91110.1.101106.78 (KB-AHR04D), 91210.1.101106.78 (KB-AHR08D), 91310.1.101106.78 (KB-AHR16D), 95110.1.100290.78A (KB-IRIP04A), 95210.1.100290.78A (KB-IRIP08A), 95310.1.100290.78A (KB-IRIP16A)

Operating Systems: Embedded OS specific to KB Device products

Default Config Vulnerable: ⚠️ Yes

Notes: All affected products in default configuration are vulnerable. These are specialized recording/network devices.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Full device compromise allowing remote code execution, data theft, device bricking, or use as pivot point in network attacks.

🟠

Likely Case

Unauthorized access leading to device configuration changes, data exfiltration, or disruption of recording/network functions.

🟢

If Mitigated

Limited impact if devices are isolated in segmented networks with strict access controls and monitoring.

🌐 Internet-Facing: HIGH - CVSS 9.8 indicates critical risk for internet-exposed devices allowing unauthenticated remote attacks.

🏢 Internal Only: MEDIUM - Still significant risk from internal threats or compromised internal systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

CWE-287 indicates authentication bypass, suggesting relatively straightforward exploitation once method is known.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 91110.1.101106.78 (KB-AHR04D), 91210.1.101106.78 (KB-AHR08D), 91310.1.101106.78 (KB-AHR16D), 95110.1.100290.78A (KB-IRIP04A), 95210.1.100290.78A (KB-IRIP08A), 95310.1.100290.78A (KB-IRIP16A)

Vendor Advisory: https://www.kbdevice.com/news/%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%80%e3%83%bc%e3%81%ae%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e6%94%bb%e6%92%83%e3%81%ab%e5%af%be%e3%81%99%e3%82%8b%e3%82%a2%e3%83%83%e3%83%97%e3%83%87/

Restart Required: Yes

Instructions:

1. Download firmware update from KB Device support portal. 2. Backup device configuration. 3. Apply firmware update via device web interface. 4. Reboot device. 5. Verify version update and functionality.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate affected devices in separate VLAN with strict firewall rules limiting access to management interfaces.

Access Control Lists

all

Implement IP-based restrictions allowing only authorized management stations to access device interfaces.

🧯 If You Can't Patch

Immediately remove devices from internet-facing networks
Implement strict network segmentation and monitor all traffic to/from affected devices

🔍 How to Verify

Check if Vulnerable:

Check device firmware version via web interface or SSH/Telnet if available. Compare against patched versions listed in advisory.

Check Version:

Check via device web interface under System > Firmware or similar menu. No universal CLI command available.

Verify Fix Applied:

Confirm firmware version matches or exceeds patched versions. Test authentication mechanisms remain functional.

📡 Detection & Monitoring

Log Indicators:

Failed authentication attempts followed by successful access
Unusual configuration changes
Unexpected command execution logs

Network Indicators:

Unauthorized access to management ports (typically 80/443)
Unusual outbound connections from devices

SIEM Query:

source_ip IN [device_ips] AND (event_type="authentication" AND result="success" FROM unknown_users) OR (event_type="configuration_change" FROM unexpected_sources)

📊 Metadata

CVE ID: CVE-2023-30762

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-287

Published: June 13, 2023

Last Updated: January 3, 2025

🔗 References

https://jvn.jp/en/vu/JVNVU90812349/ Third Party Advisory
https://www.kbdevice.com/news/%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%80%e3%83%bc%e3%81%ae%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e6%94%bb%e6%92%83%e3%81%ab%e5%af%be%e3%81%99%e3%82%8b%e3%82%a2%e3%83%83%e3%83%97%e3%83%87/ Mitigation,Vendor Advisory
https://jvn.jp/en/vu/JVNVU90812349/ Third Party Advisory
https://www.kbdevice.com/news/%e3%83%ac%e3%82%b3%e3%83%bc%e3%83%80%e3%83%bc%e3%81%ae%e3%83%8d%e3%83%83%e3%83%88%e3%83%af%e3%83%bc%e3%82%af%e6%94%bb%e6%92%83%e3%81%ab%e5%af%be%e3%81%99%e3%82%8b%e3%82%a2%e3%83%83%e3%83%97%e3%83%87/ Mitigation,Vendor Advisory

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