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* 產品  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 產品  
  [AI 支援的網路安全性](https://www.paloaltonetworks.tw/network-security?ts=markdown)
  
  * [透過設計保護 AI](https://www.paloaltonetworks.tw/precision-ai-security/secure-ai-by-design?ts=markdown)
  
  * [Prisma AIRS](https://www.paloaltonetworks.tw/prisma/prisma-ai-runtime-security?ts=markdown)
  
  * [AI 存取安全性](https://www.paloaltonetworks.tw/sase/ai-access-security?ts=markdown)
  
  * [雲端交付的安全服務](https://www.paloaltonetworks.tw/network-security/security-subscriptions?ts=markdown)
  
  * [進階威脅防禦](https://www.paloaltonetworks.tw/network-security/advanced-threat-prevention?ts=markdown)
  
  * [進階 URL Filtering](https://www.paloaltonetworks.tw/network-security/advanced-url-filtering?ts=markdown)
  
  * [Advanced WildFire](https://www.paloaltonetworks.tw/network-security/advanced-wildfire?ts=markdown)
  
  * [進階 DNS 安全性](https://www.paloaltonetworks.tw/network-security/advanced-dns-security?ts=markdown)
  
  * [企業數據遺失防護](https://www.paloaltonetworks.tw/sase/enterprise-data-loss-prevention?ts=markdown)
  
  * [企業 IoT Security](https://www.paloaltonetworks.tw/network-security/enterprise-device-security?ts=markdown)
  
  * [醫療 IoT Security](https://www.paloaltonetworks.tw/network-security/medical-iot-security?ts=markdown)
  
  * [工業 OT 安全性](https://www.paloaltonetworks.tw/network-security/industrial-ot-security?ts=markdown)
  
  * [SaaS 安全性](https://www.paloaltonetworks.tw/sase/saas-security?ts=markdown)
  
  * [新世代防火牆](https://www.paloaltonetworks.tw/network-security/next-generation-firewall?ts=markdown)
  
  * [硬體防火牆](https://www.paloaltonetworks.tw/network-security/hardware-firewall-innovations?ts=markdown)
  
  * [軟體防火牆](https://www.paloaltonetworks.tw/network-security/software-firewalls?ts=markdown)
  
  * [Strata Cloud Manager](https://www.paloaltonetworks.tw/network-security/strata-cloud-manager?ts=markdown)
  
  * [新世代防火牆 SD-WAN](https://www.paloaltonetworks.tw/network-security/sd-wan-subscription?ts=markdown)
  
  * [PAN-OS](https://www.paloaltonetworks.tw/network-security/pan-os?ts=markdown)
  
  * [Panorama](https://www.paloaltonetworks.tw/network-security/panorama?ts=markdown)
  
  * [安全存取服務邊緣](https://www.paloaltonetworks.tw/sase?ts=markdown)
  
  * [Prisma SASE](https://www.paloaltonetworks.tw/sase?ts=markdown)
  
  * [應用程式加速](https://www.paloaltonetworks.tw/sase/app-acceleration?ts=markdown)
  
  * [自主數位體驗管理](https://www.paloaltonetworks.tw/sase/adem?ts=markdown)
  
  * [企業 DLP](https://www.paloaltonetworks.tw/sase/enterprise-data-loss-prevention?ts=markdown)
  
  * [Prisma Access](https://www.paloaltonetworks.tw/sase/access?ts=markdown)
  
  * [Prisma 瀏覽器](https://www.paloaltonetworks.tw/sase/prisma-browser?ts=markdown)
  
  * [Prisma SD-WAN](https://www.paloaltonetworks.tw/sase/sd-wan?ts=markdown)
  
  * [遠端瀏覽器隔離](https://www.paloaltonetworks.tw/sase/remote-browser-isolation?ts=markdown)
  
  * [SaaS 安全性](https://www.paloaltonetworks.tw/sase/saas-security?ts=markdown)  
    [人工智慧驅動的安全性作業平台](https://www.paloaltonetworks.tw/cortex?ts=markdown)
  
  * [雲端安全](https://www.paloaltonetworks.tw/cortex/cloud?ts=markdown)
  
  * [Cortex Cloud](https://www.paloaltonetworks.tw/cortex/cloud?ts=markdown)
  
  * [應用程式安全性](https://www.paloaltonetworks.tw/cortex/cloud/application-security?ts=markdown)
  
  * [雲端狀況安全性](https://www.paloaltonetworks.tw/cortex/cloud/cloud-posture-security?ts=markdown)
  
  * [雲端執行階段安全性](https://www.paloaltonetworks.tw/cortex/cloud/runtime-security?ts=markdown)
  
  * [Prisma Cloud](https://www.paloaltonetworks.tw/prisma/cloud?ts=markdown)
  
  * [AI 驅動的 SOC](https://www.paloaltonetworks.tw/cortex?ts=markdown)
  
  * [Cortex Advanced Email Security](https://www.paloaltonetworks.tw/cortex/advanced-email-security?ts=markdown)
  
  * [Cortex Exposure Management](https://www.paloaltonetworks.tw/cortex/exposure-management?ts=markdown)
  
  * [Cortex XSIAM](https://www.paloaltonetworks.tw/cortex/cortex-xsiam?ts=markdown)
  
  * [Cortex XDR](https://www.paloaltonetworks.tw/cortex/cortex-xdr?ts=markdown)
  
  * [Cortex XSOAR](https://www.paloaltonetworks.tw/cortex/cortex-xsoar?ts=markdown)
  
  * [Cortex Xpanse](https://www.paloaltonetworks.tw/cortex/cortex-xpanse?ts=markdown)
  
  * [Unit 42 託管式偵測與回應](https://www.paloaltonetworks.tw/cortex/managed-detection-and-response?ts=markdown)
  
  * [受管理 XSIAM](https://www.paloaltonetworks.tw/cortex/managed-xsiam?ts=markdown)

* 解決方案  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 解決方案  
  AI 安全性
  
  * [安全的 AI 生態系統](https://www.paloaltonetworks.tw/prisma/prisma-ai-runtime-security?ts=markdown)
  * [安全使用 GenAI](https://www.paloaltonetworks.tw/sase/ai-access-security?ts=markdown)  
    網路安全
  * [雲端網路安全性](https://www.paloaltonetworks.tw/network-security/software-firewalls?ts=markdown)
  * [數據中心安全](https://www.paloaltonetworks.tw/network-security/data-center?ts=markdown)
  * [DNS 安全性](https://www.paloaltonetworks.tw/network-security/advanced-dns-security?ts=markdown)
  * [入侵偵測和防禦](https://www.paloaltonetworks.tw/network-security/advanced-threat-prevention?ts=markdown)
  * [物聯網安全性](https://www.paloaltonetworks.tw/network-security/enterprise-device-security?ts=markdown)
  * [5G 安全性](https://www.paloaltonetworks.tw/network-security/5g-security?ts=markdown)
  * [保護所有應用程式、使用者和位置](https://www.paloaltonetworks.tw/sase/secure-users-data-apps-devices?ts=markdown)
  * [安全的分公司轉型](https://www.paloaltonetworks.tw/sase/secure-branch-transformation?ts=markdown)
  * [在任何裝置上安全工作](https://www.paloaltonetworks.tw/sase/secure-work-on-any-device?ts=markdown)
  * [VPN 取代](https://www.paloaltonetworks.tw/sase/vpn-replacement-for-secure-remote-access?ts=markdown)
  * [網路與網路釣魚安全性](https://www.paloaltonetworks.tw/network-security/advanced-url-filtering?ts=markdown)  
    雲端安全
  * [應用程式安全狀況管理 (ASPM)](https://www.paloaltonetworks.tw/cortex/cloud/application-security-posture-management?ts=markdown)
  * [軟體供應鏈安全性](https://www.paloaltonetworks.tw/cortex/cloud/software-supply-chain-security?ts=markdown)
  * [程式碼安全](https://www.paloaltonetworks.tw/cortex/cloud/code-security?ts=markdown)
  * [雲端安全狀況管理 (CSPM)](https://www.paloaltonetworks.tw/cortex/cloud/cloud-security-posture-management?ts=markdown)
  * [雲端基礎結構權限管理 (CIEM)](https://www.paloaltonetworks.tw/cortex/cloud/cloud-infrastructure-entitlement-management?ts=markdown)
  * [數據安全狀況管理 (DSPM)](https://www.paloaltonetworks.tw/cortex/cloud/data-security-posture-management?ts=markdown)
  * [AI 安全狀況管理 (AI-SPM)](https://www.paloaltonetworks.tw/cortex/cloud/ai-security-posture-management?ts=markdown)
  * [雲端偵測與回應 (CDR)](https://www.paloaltonetworks.tw/cortex/cloud-detection-and-response?ts=markdown)
  * [雲端工作負載防護 (CWP)](https://www.paloaltonetworks.tw/cortex/cloud/cloud-workload-protection?ts=markdown)
  * [Web 應用程式和 API 安全性 (WAAS)](https://www.paloaltonetworks.tw/cortex/cloud/web-app-api-security?ts=markdown)  
    安全營運
  * [雲端偵測與回應](https://www.paloaltonetworks.tw/cortex/cloud-detection-and-response?ts=markdown)
  * [網路安全自動化](https://www.paloaltonetworks.tw/cortex/network-security-automation?ts=markdown)
  * [事件案例管理](https://www.paloaltonetworks.tw/cortex/incident-case-management?ts=markdown)
  * [SOC 自動化](https://www.paloaltonetworks.tw/cortex/security-operations-automation?ts=markdown)
  * [威脅情報管理](https://www.paloaltonetworks.tw/cortex/threat-intel-management?ts=markdown)
  * [託管式偵測與回應](https://www.paloaltonetworks.tw/cortex/managed-detection-and-response?ts=markdown)
  * [攻擊範圍管理](https://www.paloaltonetworks.tw/cortex/cortex-xpanse/attack-surface-management?ts=markdown)
  * [合規性管理](https://www.paloaltonetworks.tw/cortex/cortex-xpanse/compliance-management?ts=markdown)
  * [網際網路營運管理](https://www.paloaltonetworks.tw/cortex/cortex-xpanse/internet-operations-management?ts=markdown)  
    端點安全
  * [端點防護](https://www.paloaltonetworks.tw/cortex/endpoint-protection?ts=markdown)
  * [擴展的偵測與回應](https://www.paloaltonetworks.tw/cortex/detection-and-response?ts=markdown)
  * [勒索軟體防護](https://www.paloaltonetworks.tw/cortex/ransomware-protection?ts=markdown)
  * [數位鑑識](https://www.paloaltonetworks.tw/cortex/digital-forensics?ts=markdown)  
    [產業](https://www.paloaltonetworks.tw/industry?ts=markdown)
  * [公共部門](https://www.paloaltonetworks.com/industry/public-sector)
  * [金融服務](https://www.paloaltonetworks.com/industry/financial-services)
  * [製造](https://www.paloaltonetworks.com/industry/manufacturing)
  * [醫療](https://www.paloaltonetworks.com/industry/healthcare)
  * [中小企業解決方案](https://www.paloaltonetworks.com/industry/small-medium-business-portfolio)

* 服務  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 服務  
  [威脅情報和事件回應服務](https://www.paloaltonetworks.tw/unit42?ts=markdown)
  
  * [評估](https://www.paloaltonetworks.tw/unit42/assess?ts=markdown)
  
  * [AI 安全評估](https://www.paloaltonetworks.tw/unit42/assess/ai-security-assessment?ts=markdown)
  
  * [攻擊面評估](https://www.paloaltonetworks.tw/unit42/assess/attack-surface-assessment?ts=markdown)
  
  * [入侵整備審查](https://www.paloaltonetworks.tw/unit42/assess/breach-readiness-review?ts=markdown)
  
  * [BEC 整備評估](https://www.paloaltonetworks.com/bec-readiness-assessment)
  
  * [雲端安全性評估](https://www.paloaltonetworks.com/unit42/assess/cloud-security-assessment)
  
  * [入侵評估](https://www.paloaltonetworks.tw/unit42/assess/compromise-assessment?ts=markdown)
  
  * [網路風險評估](https://www.paloaltonetworks.tw/unit42/assess/cyber-risk-assessment?ts=markdown)
  
  * [併購和收購網路盡職調查](https://www.paloaltonetworks.tw/unit42/assess/mergers-acquisitions-cyber-due-dilligence?ts=markdown)
  
  * [滲透測試](https://www.paloaltonetworks.tw/unit42/assess/penetration-testing?ts=markdown)
  
  * [紫隊演習](https://www.paloaltonetworks.tw/unit42/assess/purple-teaming?ts=markdown)
  
  * [勒索軟體整備評估](https://www.paloaltonetworks.tw/unit42/assess/ransomware-readiness-assessment?ts=markdown)
  
  * [SOC 評估](https://www.paloaltonetworks.com/unit42/assess/cloud-security-assessment)
  
  * [供應鏈風險評估](https://www.paloaltonetworks.tw/unit42/assess/supply-chain-risk-assessment?ts=markdown)
  
  * [桌面演習](https://www.paloaltonetworks.tw/unit42/assess/tabletop-exercise?ts=markdown)
  
  * [Unit 42 聘用團隊](https://www.paloaltonetworks.tw/unit42/retainer?ts=markdown)
  
  * [回應](https://www.paloaltonetworks.tw/unit42/respond?ts=markdown)
  
  * [雲端事件回應](https://www.paloaltonetworks.tw/unit42/respond/cloud-incident-response?ts=markdown)
  
  * [數位鑑識](https://www.paloaltonetworks.tw/unit42/respond/digital-forensics?ts=markdown)
  
  * [事件回應](https://www.paloaltonetworks.tw/unit42/respond/incident-response?ts=markdown)
  
  * [受管理偵測與回應](https://www.paloaltonetworks.tw/unit42/respond/managed-detection-response?ts=markdown)
  
  * [受管理威脅搜補](https://www.paloaltonetworks.tw/unit42/respond/managed-threat-hunting?ts=markdown)
  
  * [受管理 XSIAM](https://www.paloaltonetworks.tw/cortex/managed-xsiam?ts=markdown)
  
  * [Unit 42 聘用團隊](https://www.paloaltonetworks.tw/unit42/retainer?ts=markdown)
  
  * [轉型](https://www.paloaltonetworks.tw/unit42/transform?ts=markdown)
  
  * [投資者關係計劃的制定和審查](https://www.paloaltonetworks.tw/unit42/transform/incident-response-plan-development-review?ts=markdown)
  
  * [安全性計劃設計](https://www.paloaltonetworks.tw/unit42/transform/security-program-design?ts=markdown)
  
  * [虛擬資安長](https://www.paloaltonetworks.tw/unit42/transform/vciso?ts=markdown)
  
  * [零信任諮詢](https://www.paloaltonetworks.com/unit42/assess/cloud-security-assessment)  
    [全球客戶服務](https://www.paloaltonetworks.tw/services?ts=markdown)
  
  * [教育與訓練](https://www.paloaltonetworks.com/services/education)
  
  * [專業服務](https://www.paloaltonetworks.com/services/consulting)
  
  * [成功工具](https://www.paloaltonetworks.com/services/customer-success-tools)
  
  * [支援服務](https://www.paloaltonetworks.com/services/solution-assurance)
  
  * [客戶成功](https://www.paloaltonetworks.com/services/customer-success)  
    [![](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/logo-unit-42.svg)  
    Unit 42 聘用團隊
    針對企業需求所量身打造，您可以選擇將聘用團隊時數分配至任何產品，包括主動式網路風險管理服務。了解您如何為世界級的 Unit 42 事件回應團隊設定快速撥號。
    進一步了解](https://www.paloaltonetworks.tw/unit42/retainer?ts=markdown)

* 合作夥伴  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 合作夥伴  
  NextWave 合作夥伴
  
  * [NextWave 合作夥伴社群](https://www.paloaltonetworks.com/partners)
  * [雲端服務供應商](https://www.paloaltonetworks.com/partners/nextwave-for-csp)
  * [全球系統整合商](https://www.paloaltonetworks.com/partners/nextwave-for-gsi)
  * [技術合作夥伴](https://www.paloaltonetworks.com/partners/technology-partners)
  * [服務供應商](https://www.paloaltonetworks.com/partners/service-providers)
  * [解決方案供應商](https://www.paloaltonetworks.com/partners/nextwave-solution-providers)
  * [受管理安全性服務供應商](https://www.paloaltonetworks.com/partners/managed-security-service-providers)  
    採取動作
  * [入口網站登入](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=becomepartner)
  * [託管服務計劃](https://www.paloaltonetworks.com/partners/managed-security-services-provider-program)
  * [成為合作夥伴](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=becomepartner)
  * [要求存取權](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerregistration?type=requestaccess)
  * [尋找合作夥伴](https://paloaltonetworks.my.site.com/NextWavePartnerProgram/s/partnerlocator)  
    [CYBERFORCE
    CYBERFORCE 代表由於本身的安全專業知識而獲得信賴的前 1% 合作夥伴工程師。
    進一步了解](https://www.paloaltonetworks.com/cyberforce)

* 公司  
  ![black arrow pointing left to go back to main navigation](https://www.paloaltonetworks.com/etc/clientlibs/clean/imgs/arrow-right-black.svg) 公司  
  Palo Alto Networks
  
  * [關於我們](https://www.paloaltonetworks.tw/about-us?ts=markdown)
  * [管理團隊](https://www.paloaltonetworks.com/about-us/management)
  * [投資人關係](https://investors.paloaltonetworks.com/)
  * [地點](https://www.paloaltonetworks.com/about-us/locations)
  * [道德規範與合規性](https://www.paloaltonetworks.com/company/ethics-and-compliance)
  * [企業責任](https://www.paloaltonetworks.com/about-us/corporate-responsibility)
  * [軍人與退伍軍人](https://jobs.paloaltonetworks.com/military)  
    [為何選擇 Palo Alto Networks？](https://www.paloaltonetworks.tw/why-paloaltonetworks?ts=markdown)
  * [Precision AI 安全性](https://www.paloaltonetworks.tw/precision-ai-security?ts=markdown)
  * [我們的平台方法](https://www.paloaltonetworks.tw/why-paloaltonetworks/platformization?ts=markdown)
  * [加速您的網路安全轉型](https://www.paloaltonetworks.com/why-paloaltonetworks/nam-cxo-portfolio)
  * [獎項和認可](https://www.paloaltonetworks.com/about-us/awards)
  * [客戶案例](https://www.paloaltonetworks.tw/customers?ts=markdown)
  * [全球認證](https://www.paloaltonetworks.com/legal-notices/trust-center/compliance)
  * [信任 360 計劃](https://www.paloaltonetworks.com/resources/whitepapers/trust-360)  
    人才招募
  * [概觀](https://jobs.paloaltonetworks.com/)
  * [文化與社福](https://jobs.paloaltonetworks.com/culture)  
    [Newsweek 最受喜愛工作場所名單
    真正為員工著想的企業
    閱讀更多內容](https://www.paloaltonetworks.com/company/press/2021/palo-alto-networks-secures-top-ranking-on-newsweek-s-most-loved-workplaces-list-for-2021)

* 更多  
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* [什麼是 CNAME](#what)
* [懸空 DNS](#dangling)
* [懸而未決的 DNS 常見問題](#faqs)

# 什麼是 Dangling DNS？

目錄

* [什麼是 CNAME](#what)
* [懸空 DNS](#dangling)
* [懸而未決的 DNS 常見問題](#faqs)

1. 什麼是 CNAME

* [1. 什麼是 CNAME](#what)
* [2. 懸空 DNS](#dangling)
* [3. 懸而未決的 DNS 常見問題](#faqs)  
  要瞭解當前 DNS，您必須先瞭解 DNS 的基本知識。DNS 是一種通訊協定，可將使用者易於記憶和辨識的網域名稱 (例如 paloaltonetworks.com)，轉換為數字 IP 位址。每個網域的 IP 位址都儲存在權威 DNS 伺服器中，就像網際網路的電話簿一樣。當您在瀏覽器中輸入網站位址時，瀏覽器會先連線到遞歸 DNS 伺服器，然後問「paloaltonetworks.com 的 IP 位址是什麼？」。遞歸 DNS 伺服器會傳送查詢到權威伺服器，以獲得答案。

## 什麼是 CNAME

儲存於 DNS 權威伺服器的常見記錄類型包括權威起始 (SOA)、IP 位址、名稱伺服器 (NS)、用於反向 DNS 查閱伺服器的指針 (PTR) 以及正名記錄 (CNAME)。

CNAME 是一種 DNS 資料庫記錄，可作為其他網域的別名，並指向一個網域而非 IP 位址。CNAME 記錄通常用於將同一組織擁有的多個網站指向一個主網站，在不同國家註冊相同的網域名稱，使每個網域都指向父網域，等等。

假設您公司的網域名稱是 supercompany\[.\]com，推出新的服務或產品，並建立一個新的子網域名稱 superproduct\[.\]supercomany\[.\]com。當此子網域設定為大家都認可的父網域別名時，子網域 superproduct\[.\]supercomany\[.\]com，將有一個 CNAME 記錄指向 supercompany\[.\]com。

## 懸空 DNS

當 DNS 記錄將網域名稱指向其他網域時，當一個網域被放棄時，該 DNS 記錄就會懸空，現在稱為懸空 DNS 記錄。由於是棄用的網域，威脅行為者可以輕易搶用此網域，並藉此取得進入網路的初始權限。攻擊者經常使用此 Dangling DNS 技術進行網路釣魚和其他社會工程攻擊。舉例來說，superproduct.supercomany.com 指向其他網域，例如 superproduct.com，或外部主機或 IP，例如 compute1234.amazonaws.com，公司遷離 superproduct.com 或託管該名稱的計算節點，但他們忘記 CNAME superproduct.supercomany.com 仍指向過期的網域或外部主機名稱/IP。這表示主網域 supercomany.com 已成為攻擊者寄存惡意網站的首選。駭客可以在 SSL 憑證上安裝 superproduct.supercomany.com，然後以犧牲公司聲譽為代價，傳送惡意內容。

若要瞭解 Palo Alto Networks 的 DNS 安全性，請造訪 [https://www.paloaltonetworks.tw/network-security/advanced-dns-security。](https://www.paloaltonetworks.tw/network-security/advanced-dns-security?ts=markdown)如需 Dangling DNS 的詳細資訊，請閱讀我們的部落格： [Dangling Domains：安全威脅、偵測與普遍性](https://unit42.paloaltonetworks.com/dangling-domains/)。

## 懸而未決的 DNS 常見問題

### 為什麼 Dangling DNS 記錄被視為安全威脅？

懸空的 DNS 記錄可能會構成重大的安全風險，因為它們指向的網域名稱或服務已不再有效或不受網域名稱擁有者的控制。攻擊者可利用這些記錄註冊過期網域、取得子網域的控制權，並利用這些記錄截取流量、竊取敏感資料、進行網路釣魚攻擊或散佈惡意軟體。這可能導致未經授權存取系統、資料外洩或冒充合法服務。

### 什麼是子網域接管，它與 Dangling DNS 有何關聯？

當攻擊者取得仍在 DNS 記錄中活動的子網域的控制權，但指向的資源已不在網域擁有者的控制之下時，就會發生子網域接管。懸空的 DNS 記錄，尤其是 CNAME 或 MX 記錄，通常會導致子域被接管。例如，假設 CNAME 記錄指向已停用的外部服務。在這種情況下，攻擊者可以註冊該外部網域並劫持該子網域，使其能夠託管惡意內容或攔截原本用於合法網域的通訊。

### 組織如何保護自己免受 Dangling DNS 威脅？

組織可以透過定期審核和更新 DNS 記錄來保護自己，移除任何不再需要或指向停用資源的 DNS 記錄。他們也應該實作安全措施，例如啟用 DMARC（網域訊息驗證、報告與一致性）和 DKIM（網域識別郵件）進行電子郵件驗證，這有助於防止在網路釣魚或偽冒攻擊中濫用 DNS 記錄。此外，使用與作用中資源綁定的 DNS 別名記錄可以防止發生懸空引用。

### Dangling DNS 漏洞在實務上有哪些範例？

Dangling DNS 漏洞可以透過各種方式被利用，例如透過指向過期網域的 DNS MX 記錄，讓攻擊者可以攔截電子郵件或利用網域進行網路釣魚活動。同樣地，攻擊者也可以針對未使用的 CNAME 記錄來接管子網域，並託管惡意內容。擁有多個網域和子網域的組織應密切注意這些記錄，以防止未經授權的使用。

### 是否只有大型組織才會擔心 DNS 記錄懸掛的問題？

懸空的 DNS 記錄關係到各種規模的組織，從新創公司到大型企業。雖然大型組織可能擁有更廣泛的 DNS 基礎架構，因此記錄被忽略的風險也較高，但如果小型公司的 DNS 記錄管理不善，也可能成為攻擊目標。不論組織規模大小，定期監控和維護 DNS 輸入項目對降低此風險至關重要。
相關內容  
[使用進階 DNS 安全性保護您的網路
瞭解如何保護網路免受攻擊、防止資料外洩，並確保無縫的安全性管理。](https://www.paloaltonetworks.tw/network-security/advanced-dns-security?ts=markdown)  
[視訊：Palo Alto Networks 的進階 DNS 安全性
使用業界最全面的 DNS 安全解決方案，阻擋 DNS 層的威脅。](https://www.youtube.com/watch?v=95D1x-LjZac)  
[進階 DNS 安全技術文件
透過雲端分析平台 Precision AI，自動保護您的 DNS 流量。](https://docs.paloaltonetworks.com/dns-security)  
[探索進階 DNS 安全性
使用 Palo Alto Networks 的 Advanced DNS security with Precision AI 即時阻止 DNS 劫持攻擊。](https://www.paloaltonetworks.com/blog/network-security/precision-ai-advanced-dns/)  
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