February 2021
Beginner to intermediate
372 pages
6h 48m
Korean
Content preview from 웹 애플리케이션 보안: 정찰, 공격, 방어 세 단계로 배우는 웹 애플리케이션 보안의 모든 것
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
196
2
부
공격
12.1
직접
XXE
직접
XXE
에서는
XML
객체가 외부 엔티티 플래그를 가지고 서버에 전송된 다음 파싱되어 외
부 엔티티를 포함한 결과가 반환된다 (그림
12
-
1
).
mega
-
bank
.
com
에 스크린샷 유틸리티가 있어 은행 포털에서 일어나는 일을 고객 지원부서에
직접 보낼 수 있다고 상상해보자.
사용자
1
은 서버 엔드포인트에
XML
페이로드를 보낸다.
XML
파서는
XML
페이로드를
파싱한다.
외부 엔티티 플래그가 처리되어
서버의 파일이 파싱 결과에
반영된다.
서버의 로컬 파일이
사용자
1
에게 요청 결과와
함께 전송된다.
그림
12-1
직접
XXE
클라이언트 측 구현은 다음과 같다.
<!--
클릭하면 `screenshot()` 함수를 호출하는 버튼.
-->
<button class="button"
id="screenshot-button"
onclick="screenshot()">
Send Screenshot to Support</button>
/*
* `content` 엘리먼트에서 HTML DOM을 수집하고 XML 파서를 호출해
* DOM 텍스트를 XML로 변환한다.
*
* HTTP를 통해 XML을 function()에 보내면 주어진 XML을 가지고
* 스크린샷을 생성한다.
*
197
12
장
XML 외부 엔티티(XXE)
* 스크린샷을 분석할 수 있게 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.