> For the complete documentation index, see [llms.txt](https://docs.cooku222.kr/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cooku222.kr/security/web-hacking/suninatas/suninatas-game-03.md).

# \[SuNiNaTaS] Game 03

문제 출처 : <http://suninatas.com/challenge/web03/web03.asp>

***

<figure><img src="https://blog.kakaocdn.net/dna/bl4v4N/dJMcagjAVK6/AAAAAAAAAAAAAAAAAAAAANfL3P732OtJKh5MUk7SY82qPfCWVXrKt4OBgLivAuIs/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=jVclTbGFYQ3yLji9%2Fno0aNuzdEE%3D" alt="" height="830" width="1226"><figcaption></figcaption></figure>

문제는 위와 같다.

우리는 Notice에 들어가면 글쓰기 버튼이 보이지 않아 글을 쓸 수 없다.

따라서 다른 방법을 고안해야한다!

사이드바의 다른 메뉴들 중 FREE를 눌러본다.

<figure><img src="https://blog.kakaocdn.net/dna/dKXSEB/dJMcacBuQ45/AAAAAAAAAAAAAAAAAAAAAEsVQ0SnOyiXVWOQXrs9W_o5Uj4wCsb6Td5nCQd0MPjh/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=EpAqMolVbICq1Yp0sdt2zCcAjeE%3D" alt="" height="883" width="1355"><figcaption></figcaption></figure>

free를 눌러 write 버튼을 누른다.

<figure><img src="https://blog.kakaocdn.net/dna/cS8YTx/dJMcafEZmyi/AAAAAAAAAAAAAAAAAAAAAK1oVzjUgkcrial3FgCz3VWGvh28y_Ubk9o7cdEWs8h_/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=BN8n4kJdhS41M0hxBpmfPSNHaHw%3D" alt="" height="50" width="306"><figcaption></figcaption></figure>

이때 suninatas.com/board/free/write를 suninatas.com/board/notice/write로 바꿔준다.

<figure><img src="https://blog.kakaocdn.net/dna/AzT5F/dJMcagjAVC5/AAAAAAAAAAAAAAAAAAAAAAz1w-RdDyu_MlCl39YCf1z0qVxfQn3lguEGGW4ygTy9/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=YUzjpt9YbwCmdSc%2F0RH6%2B%2FMR%2BOs%3D" alt="" height="863" width="1282"><figcaption></figcaption></figure>

아무 제목과 아무 내용을 입력하면 Authkey를 획득할 수 있다.&#x20;

<figure><img src="https://blog.kakaocdn.net/dna/vpz2y/dJMcafdU0qu/AAAAAAAAAAAAAAAAAAAAAE1PFUh03saJN6z-59SGv5jWXpF6fvV3C5KkUzgwUn0z/img.png?credential=yqXZFxpELC7KVnFOS48ylbz2pIh7yKj8&#x26;expires=1782831599&#x26;allow_ip=&#x26;allow_referer=&#x26;signature=v71nVuuw%2FEuQintXQwlQ3pLcxaM%3D" alt="" height="181" width="561"><figcaption></figcaption></figure>

Auth란에 넣으면 솔브가 뜬다.<br>

해당 사이트가 클라이언트 단에서 화면에 버튼만 숨긴 상태로 경로를 관리해주고 있다. 즉 **서버는 URL만 맞으면 write 페이지를 그냥 보내주고 프론트엔드에만 notice에서 write으로 가는 버튼만 없을 뿐인 것**이다. 심지어 접근 제어가 걸려있지 않아 프론트엔드 UI에서 버튼이 없어도 URL만 직접 입력하면 서버는 그대로 notice write 화면으로 렌더링 해주고 우리는 인증키를 획득할 수 있게 된다.&#x20;


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