[OpenPKG-SA-2003.012] OpenPKG Security Advisory (dhcpd)

[OpenPKG <openpkg () openpkg org>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

________________________________________________________________________

OpenPKG Security Advisory                            The OpenPKG Project
http://www.openpkg.org/security.html              http://www.openpkg.org
openpkg-security () openpkg org                         openpkg () openpkg org
OpenPKG-SA-2003.012                                          19-Feb-2003
________________________________________________________________________

Package:             dhcpd
Vulnerability:       denial of service (packet storm)
OpenPKG Specific:    no

Affected Releases:   Affected Packages:          Corrected Packages:
OpenPKG CURRENT      <= dhcpd-3.0.1rc11-20030116 >= dhcpd-3.0.1rc11-20030219
OpenPKG 1.2          <= dhcpd-3.0.1rc11-1.2.0    >= dhcpd-3.0.1rc11-1.2.1
OpenPKG 1.1          <= dhcpd-3.0.1rc9-1.1.1     >= dhcpd-3.0.1rc9-1.1.2

Affected Releases:   Dependent Packages: none

Description:
  Florian Lohoff discovered a bug [0] in dhcrelay which is part of the
  ISC DHCP Distribution [1]. The bug is causing the relay agent to
  send a continuing packet storm towards the configured DHCP server(s)
  in case of a malicious BOOTP packet. The Common Vulnerabilities and
  Exposures (CVE) project assigned the id CAN-2003-0039 [2] to the
  problem.

  Our update does not ultimately fix the root cause of the problem.
  However, it improves dhcrelay's compliance to RFC1542 [10] by
  rigorously supporting the requirements listed in section "4.1.1
  BOOTREQUEST Messages" and thus limiting havoc wreaked to the network:

  "The relay agent MUST silently discard BOOTREQUEST messages whose
  'hops' field exceeds the value 16. A configuration option SHOULD be
  provided to set this threshold to a smaller value if desired by the
  network manager. The default setting for a configurable threshold
  SHOULD be 4."

  The added configuration option is named "-c". Its default value to 4
  and the allowed range of the value is between 0 and 16.

  Please check whether you are affected by running "<prefix>/bin/rpm
  -q dhcpd". If you have the "dhcpd" package installed and its version
  is affected (see above), we recommend that you immediately upgrade
  it (see Solution). [3][4]

Solution:
  Select the updated source RPM appropriate for your OpenPKG release
  [5][6], fetch it from the OpenPKG FTP service [7][8] or a mirror
  location, verify its integrity [9], build a corresponding binary RPM
  from it [3] and update your OpenPKG installation by applying the binary
  RPM [4]. For the current release OpenPKG 1.1, perform the following
  operations to permanently fix the security problem (for other releases
  adjust accordingly).

  $ ftp ftp.openpkg.org
  ftp> bin
  ftp> cd release/1.2/UPD
  ftp> get dhcpd-3.0.1rc11-1.2.1.src.rpm
  ftp> bye
  $ <prefix>/bin/rpm -v --checksig dhcpd-3.0.1rc11-1.2.1.src.rpm
  $ <prefix>/bin/rpm --rebuild dhcpd-3.0.1rc11-1.2.1.src.rpm
  $ su -
  # <prefix>/bin/rpm -Fvh <prefix>/RPM/PKG/dhcpd-3.0.1rc11-1.2.1.*.rpm
________________________________________________________________________

References:
  [0] http://marc.theaimsgroup.com/?l=bugtraq&m=104310927813830&w=2
  [1] http://www.isc.org/products/DHCP/dhcp-v3.html
  [2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0039
  [3] http://www.openpkg.org/tutorial.html#regular-source
  [4] http://www.openpkg.org/tutorial.html#regular-binary
  [5] ftp://ftp.openpkg.org/release/1.1/UPD/dhcpd-3.0.1rc9-1.1.2.src.rpm
  [6] ftp://ftp.openpkg.org/release/1.2/UPD/dhcpd-3.0.1rc11-1.2.1.src.rpm
  [7] ftp://ftp.openpkg.org/release/1.1/UPD/
  [8] ftp://ftp.openpkg.org/release/1.2/UPD/
  [9] http://www.openpkg.org/security.html#signature
  [10] ftp://ftp.rfc-editor.org/in-notes/rfc1542.txt
________________________________________________________________________

For security reasons, this advisory was digitally signed with
the OpenPGP public key "OpenPKG <openpkg () openpkg org>" (ID 63C4CB9F)
of the OpenPKG project which you can find under the official URL
http://www.openpkg.org/openpkg.pgp or on http://keyserver.pgp.com/. To
check the integrity of this advisory, verify its digital signature by
using GnuPG (http://www.gnupg.org/). For instance, pipe this message to
the command "gpg --verify --keyserver keyserver.pgp.com".
________________________________________________________________________

-----BEGIN PGP SIGNATURE-----
Comment: OpenPKG <openpkg () openpkg org>

iD8DBQE+U5MDgHWT4GPEy58RAu2qAKDMZ71rpxv4YgazQQw2fSi2mlfTIACfflr6
OF+yy6uSaCRuw/RlzUVzhic=
=kWcV
-----END PGP SIGNATURE-----