[Webhacking.kr] 34번

오랜만에 쓰는 웹해킹 글..!!!

자바스크립트 문제라고 나와있기도하고, alert가 뜬걸 보니 이걸 기억해두자.

확인을 누르면 그냥 까만화면이 유지된다. 소스보기를 눌러 소스를확인해보자.

<html>
<head>
<title>Challenge 34</title>
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<body bgcolor="black">

복잡하고 행복한 소스가 가득하다. 보기가 힘드니 편안히 코드를 포맷시켜주는 사이트를 이용해 코드를 확인해보자.

www.prettifyjs.net/

JS Beautify and Minify - Online

Beautify (prettify) or Minify (uglify) your JS data with advanced formatting options. Enter our site for an easy-to-use online tool.

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그리고 편안한 상태에서, 아까 우리가 페이지 입장할 때의 alert를 기억에 떠올려 alert를 검색해보자.

if (location[b('0x19', 'iUmC')][b('0x1a', '6]r1')](0x1) == b('0x1b', 'RLUb')) 
    location[b('0x1c', '4c%d')] = b('0x1d', 'llaF');
 else 
    alert(b('0x1e', '14cN'));

그럼 요런 구문이 하나 나온다.

alert구문을 크롬 콘솔창에 넣어보면 "debug me"가 출력된다. 이 부분이 실행되는게 맞다는 것..!!

그렇다면 이와 반대되는 경우인 location[location[b('0x1c', '4c%d')] = b('0x1d', 'llaF'); 을 콘솔에 입력해보자 (location이므로 아마 어디론가 이동하는 코드일 것)

그럼 다소 허무하게도 ?Passw0RRdd=1이 콘솔에 출력됨과 동시에 해당 페이지로 이동이 되면서 문제가 풀린다.

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[Webhacking.kr] 34번

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