CVE-2023-4346（knx connection authorization）の深刻度・悪用状況・対象バージョン
概要
KNX devices that use KNX Connection Authorization and support Option 1 are, depending on the implementation, vulnerable to being locked and users being unable to reset them to gain access to the device. The BCU key feature on the devices can be used to create a password for the device, but this password can often not be reset without entering the current password. If the device is configured to interface with a network, an attacker with access to that network could interface with the KNX installation, purge all devices without additional security options enabled, and set a BCU key, locking the device. Even if a device is not connected to a network, an attacker with physical access to the device could also exploit this vulnerability in the same way.
CISA の要求対応: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
影響を受ける製品
| ベンダー | 製品 | 対象バージョン |
|---|---|---|
| knx | connection_authorization | すべて／記載なし |
基本情報
- 公開日
- 2023-08-29
- 最終更新
- 2026-07-16
- NVD の状態
- Analyzed
- 弱点の種類
- CWE-645
対策の進め方
- 上の表で、使っている製品とバージョンが対象か確認します。
- ベンダーの公式アドバイザリ（下の参考情報の「Vendor Advisory」「Patch」）で修正版・回避策を確認します。
- 悪用が確認されているため、パッチ適用までの間もアクセス制限・侵害の痕跡確認を検討します。
- 日本語の情報は JVN iPedia で CVE-2023-4346 を検索 できます。
参考情報
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 Third Party AdvisoryUS Government Resource
- https://www.cisa.gov/news-events/ics-advisories/icsa-23-236-01 Third Party AdvisoryUS Government Resource
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-4346 US Government Resource
- NVD: CVE-2023-4346
- CVE.org: CVE-2023-4346
データ出典: NIST NVD、CISA KEV、FIRST EPSS。翻訳は参考情報で、正確性は原文を優先してください。