ISC DHCP dhcrelay (dhcp-relay) denial of service

dhcp-dhcrelay-dos (11187) The risk level is classified as MediumMedium Risk


dhcp-relay could allow a remote attacker to launch a denial of service attack against a connected DHCP server. If a remote attacker sends a malicious BOOTP packet to dhcrelay, the packet would be forwarded to a broadcast MAC address, which would cause dhcp-relay to enter into an infinite loop that would send a continuous packet storm towards the affected DHCP server.


Denial of Service


For Debian GNU/Linux:
Upgrade to the latest dhcp3 package, as listed below. Refer to DSA-245-1 for more information. See References.

Debian GNU/Linux 3.0 (woody): 3.0+3.0.1rc9-2.2 or later

For OpenPKG:
Upgrade to the latest dhcpd package, as listed below. Refer to OpenPKG Security Advisory OpenPKG-SA-2003.012 for more information. See References.

OpenPKG CURRENT: 3.0.1rc11-20030219 or later
OpenPKG 1.1: 3.0.1rc9-1.1.2 or later
OpenPKG 1.2: 3.0.1rc11-1.2.1 or later

For Red Hat Linux 8.0:
Upgrade to the latest version of dhcp (3.0pl1-26 or later), as listed in RHSA-2003:034-06. See References.

For Turbolinux:
Upgrade to the latest dhcp package, as listed below. Refer to Turbolinux Security Advisory TLSA-2003-26 for more information. See References.

Turbolinux: 3.0pl2-3 or later

For Conectiva Linux 8:
Upgrade to the latest version of dhcp (3.0-3U80_3cl or later), as listed in Conectiva Linux Security Announcement CLSA-2003:616. See References.

For other distributions:
Contact your vendor for upgrade or patch information.


Platforms Affected:

  • Conectiva Linux 8.0
  • Debian Debian Linux 3.0
  • ISC DHCPd 3.0.1 rc7
  • ISC DHCPd 3.0.1 rc8
  • ISC DHCPd 3.0.1 rc3
  • ISC DHCPd 3.0.1 rc9
  • ISC DHCPd 3.0.1 rc2
  • ISC DHCPd 3.0.1 rc10
  • ISC DHCPd 3.0.1 rc1
  • ISC DHCPd 3.0.1 rc6
  • ISC DHCPd 3.0.1 rc5
  • ISC DHCPd 3.0.1 rc4
  • OpenPKG OpenPKG 1.1
  • OpenPKG OpenPKG 1.2
  • RedHat Linux 7
  • RedHat Linux 7.1
  • RedHat Linux 7.2
  • RedHat Linux 7.3
  • RedHat Linux 8.0
  • Turbolinux Turbolinux 8 Server
  • Turbolinux Turbolinux 8 Workstation


Jan 15, 2003

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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