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在javascript url validation這個產品中，有1篇Facebook貼文，粉絲數超過16萬的網紅โปรแกรมเมอร์ไทย Thai programmer，也在其Facebook貼文中提到， โค้ดดิ้งให้ปลอดภัยจาก hacker 💥การโจมตีแบบ Cross-Site Scripting ชื่อย่อ "XSS" เป็นช่องโหว่ที่ปล่อยให้ผู้ไม่หวังดี สามารถใส่ โค้ดJava Script หรือฉีด (in...

javascript url validation 在 โปรแกรมเมอร์ไทย Thai programmer Facebook 的精選貼文

โปรแกรมเมอร์ไทย Thai programmer By โปรแกรมเมอร์ไทย Thai programmer

2020-12-06 11:29:28 有 11 人按讚
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โค้ดดิ้งให้ปลอดภัยจาก hacker
💥การโจมตีแบบ Cross-Site Scripting ชื่อย่อ "XSS"
เป็นช่องโหว่ที่ปล่อยให้ผู้ไม่หวังดี
สามารถใส่ โค้ดJava Script หรือฉีด (inject) เข้ามาได้
จากนั้น JavaScript ก็จะทำงานหน้าเว็บของผู้ใช้งาน
ซึ่งเป็นอันตรายอย่างยิ่งยวด
.
ตัวอย่างในรูปที่โพสต์
โค้ด Java Script ของ hacker
่เป็นโค้ดโชว์กล่องข้อความ ไม่มีพิษสง ไม่อันตราย
ของจริงอาจเจอผู้ประสงค์ร้าย
สามารถดำเนินการ เช่น
- อาจโดนขโมย session id
- ล้วงตับข้อมูลผู้ใช้งานนั้น
- เด้งหน้าจอให้ผู้ใช้คลิกลิงก์ไปยังเว็บอันตราย
- เด้งหน้าจอให้กดลงโปรแกรม malware
- และอื่นๆ สุดแต่ครีเอททีฟฝ่าย hacker เข้าละ
.
หมายเหตุ
🤓 เทคนิคการโจมตี XSS มีหลายแบบ
แต่นี้เป็นตัวอย่าง ชนิด Stored XSS
เป็นช่องโหว่ที่โค้ดฝั่ง Web Application
ปล่อยให้เก็บ Java Script ได้
.
พอผู้ใช้ส่ง request url มา
เว็บแอพลิเคชั่นก็เอาข้อมูล javaScript ที่อยู่ในฐานข้อมูล (hacker แอบส่งมา)
นำมาแนบไปพร้อม HTML
ส่งไปยังหน้าบราวเซอร์ของผู้ใช้
จากนั้น JavaScript ก็จะทำงานทันที
.
ซึ่งช่องโหว่นี้
#โปรแกรมเมอร์ ต้องรับผิดชอบนะจะบอกให้
แต่แก้ง่ายมากเลยสมัยนี่ เพราะ
.
1) เพราะ library/framework สายเว็บแอพลิเคชั่น
เดี๋ยวนี้มันช่วยเราได้เยอะตรงจุดๆ นี้
.
มันจะช่วยเข้ารหัสข้อมูลที่เป็น java script ไม่ให้ทำงานได้ ทำให้มันเป็นแค่ข้อความหนึ่งเท่านั้นเอง
คือเข้ารหัสพวกเครื่องหมาย <, >, /> และอื่นๆ
.
2) หรือจะใช้วิธี validation ตอนผู้ใช้กรอกข้อความ
ต้องห้ามกรอก java script ก็เป็นการป้องกันอีกวิธีหนึ่ง
.
.
เป็นช่องโหว่เจอบ่อย แต่ก็ป้องกันได้
แต่ถ้าเราไม่ใช่ library/framework มาตรฐาน
ที่เขาผ่านร้อนผ่านหน้า แก้ช่องโหว่มาให้เราแล้ว
ก็ต้องลำบากหาทางป้องกันเอา อย่าลืม
.
.
✍ เขียนโดย โปรแกรมเมอร์ไทย thai programmer

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โปรแกรมเมอร์ไทย Thai programmer

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เพจนี้เปิดใช้งานเมื่อ 22 มิถุนายน 2014 เพจนี้เน้นหนักไป ทางการเขียนโปรแกรม คอมพิวเตอร์ และไอที ล้วน ๆ แบบฮาร์ดคอ หรือจะไร้สาระ มุกตลกขำ
ให้สาระด้านไอที คอมพิวเตอร์ และอาชีพโปรแกรมเมอร์ และสายงานด้านคอมพิวเตอร์
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社群媒體上有些相關的討論：

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Simple Node.js URL Validation LibraryWelcome Folks My name is Gautam and Welcome to Coding Shiksha a ... ... <看更多>

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#85. Regex for URL validation - JavaScript - SitePoint Forums

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angular validation for url, url validation in angular, url pattern ... I am a big fan of PHP, Javascript, JQuery, Laravel, Codeigniter, ...

#89. 什么是最好的正则表达式来检查一个字符串是否是有效的URL?

language-agnostic - Regex url validation javascript - 什么是最好的正则表达式来检查一个字符串是否是有效的URL? Java URL regex / regex / url.

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URL Validation routines. ... Originally based in on php script by Debbie Dyer, validation.php v1.2b, Date: 03/07/02, http://javascript.internet.com.