Archive for ‘ 一月, 2023

如何解決 TLS/SSL 使用了不安全的加密演算法: ARCFOUR、CBC、HMAC-MD5、HMAC-RIPEMD160

弱點掃瞄

弱點: TLS Service Supports Weak Cipher Suite

Transport Layer Security (TLS), the successor to Secure Socket Layer (SSL), is a network protocol that encrypt communications between TLS servers (e.g., websites) and TLS clients (e.g., web browsers). Every communication is secured by a cipher suite: a combination of several algorithms working in concert. Cryptographic algorithms do not have a defined lifetime, but academics, researchers, and nation states are constantly evaluating them for weaknesses. Consensus on which algorithms are untrustworthy evolves over time, and if a communication is protected with a weak cipher suite then that communication can be altered or decrypted.

  • Severity: Medium
  • Risk: A TLS service was observed supporting weak cipher suites.
  • Recommendation: Disable the cipher suites listed in the evidence column of the measurement.

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如何解決 SSH Server 使用了不安全的加密演算法: ARCFOUR、CBC、HMAC-MD5、HMAC-RIPEMD160

弱點掃瞄

弱點 1: SSH Supports Weak Cipher

The SSH server is configured to support either Arcfour or Cipher Block Chaining (CBC) mode cipher algorithms. SSH can be configured to use Counter (CTR) mode encryption instead of CBC. The use of Arcfour algorithms should be disabled.

  • Severity: Medium
  • Risk: A weak cipher has been detected.
  • Recommendation: Configure the SSH server to disable Arcfour and CBC ciphers.

弱點 2: SSH Supports Weak MAC

The SSH server is configured to support MD5 algorithm. The cryptographic strength depends upon the size of the key and algorithm that is used. A Modern MAC algorithms such as SHA1 or SHA2 should be used instead.

  • Severity: Medium
  • Risk: A weak Message Authentication Code (MAC) algorithm has been detected.
  • Recommendation: Configure the SSH server to disable the use of MD5.

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如何解決 Web/Mail Server 使用了不安全的 SSL 通訊協定

弱點掃瞄

弱點: SSL/TLS Service Supports Weak Protocol

Transport Layer Security (TLS), the successor to Secure Socket Layer (SSL), is a network protocol that encrypt communications between TLS servers (e.g., websites) and TLS clients (e.g., web browsers). Every communication is secured by a cipher suite: a combination of several algorithms working in concert. Networking protocols do not have a defined lifetime, but academics, researchers, and nation states are constantly evaluating them for weaknesses. Consensus on which protocols are untrustworthy evolves over time, and if communications are sent with a weak protocol then that communication can be altered or decrypted.

  • Severity: High
  • Risk: A TLS service was observed supporting weak protocols.
  • Recommendation: Disable the protocols listed in the evidence column of the measurement.

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如何自動將網站的 http:// 網址轉址為 https://

弱點掃瞄

弱點: Site does not enforce HTTPS

The site responds to HTTP requests without ultimately redirecting the browser to a secure version of the page. Since the site allows plaintext traffic, a man-in-the-middle attacker is able to read and modify any information passed between the site and the user. There are a variety of situations in which an attacker can intercept plaintext traffic in a man-in-the-middle position, including but not limited to:

  1. Open Wi-Fi Hotspots
  2. WPA/WPA2 encrypted hot-spots where the attacker connected before the victim
  3. Malicious Wi-Fi access points
  4. Compromised switches and routers
  5. ARP poisoning on the same wired network

It's important to remember that in many of the above situations, an attacker can not only read traffic, but also actively modify the traffic. Even if a site that does not contain sensitive information, an attacker can still inject malicious content to a user’s browser.

  • Severity: High
  • Risk: Site does not enforce the use of HTTPS encryption, leaving the user vulnerable to man-in-the-middle attackers (who can falsify data and inject malicious code).
  • Recommendation: Any site served to a user (possibly at the end of a redirect chain) should be served over HTTPS.

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[Android Auto]如何解決導航時 GPS 的訊號不良、訊號中斷問題

Android Auto 車機的 GPS 定位問題

我的車機是 Pioneer AVH-Z9250BT,手機是小米 12,我通常是使用無線的方式連接車機的 Android Auto

不過在車機上的 Android Auto 使用 Google Maps 導航時,偶爾會出現行車位置漂移、GPS 訊號中斷、正在搜尋 GPS 訊號,或無法顯示地圖...之類的問題! 但是同一時間,如果我開啟手機上的導航王來查看,導航王的定位卻又無比正確!

原本以為是我的車機太爛,或有相容性的問題,上網尋找答案,又發現很多網友有同樣的問題,其中也不乏一些百萬名車內建的車機! 幸好有找到解決方法!
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