webhacking.kr(old) 6번

6번 문제에 들어가면 이렇게 view-source와

ID, PW가 적혀 있다.

일단 소스를 보도록 한다.

일단 php코드를 보니, id, pw를 base64_encode해야 하는데, 이를 20번 반복해야 함을 확인할 수 있다.

또한 1id와 pw에서 ~8을 각각 다른 문자로 대체함을 확인할 수 있다.

decode또한 20번 반복함을 확인할 수 있고,

일단 id가 admin이어야 하고 pw가 nimda여야을 확인할 수 있다.

이렇게 온라인 컴파일러로 코드를 작성해 인코딩한다.

 

user와 password에서 setcookie함을 확인할 수 있다.

id와 pw는 명시되어 있으니 20번 인코딩해보도록 한다.

php코드를 그대로 사용해도 될 것 같아

코드를 사용한다.

id를 20번 인코딩한 결과는 아래와 같다.

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이번엔 php코드를 통해 pw를 20번 인코딩한 결과를 보도록 한다.

아래와 같다.

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엄청나게 길다,,

f12를 눌러 application의 cookie를 본다.

value값을 눌러 위의 값을 넣어준다.

그 후에 사이트를 새로고침한다.

풀렸음을 확인할 수 있다.

이렇게 풀렸음을 확인할 수 있다.