[ GLSA 200908-08 ] ISC DHCP: dhcpd Denial of Service

--Sig_/2fuUaU9u.7UPIKTZM_yNTds
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: quoted-printable

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory                           GLSA 200908-08
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                                            http://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

  Severity: Normal
     Title: ISC DHCP: dhcpd Denial of Service
      Date: August 18, 2009
      Bugs: #275231
        ID: 200908-08

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Synopsis
=3D=3D=3D=3D=3D=3D=3D=3D

dhcpd as included in the ISC DHCP implementation does not properly
handle special conditions, leading to a Denial of Service.

Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

ISC DHCP is the reference implementation of the Dynamic Host
Configuration Protocol as specified in RFC 2131.

Affected packages
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

    -------------------------------------------------------------------
     Package        /  Vulnerable  /                        Unaffected
    -------------------------------------------------------------------
  1  net-misc/dhcp     < 3.1.2_p1                          >=3D 3.1.2_p1

Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Christoph Biedl discovered that dhcpd does not properly handle certain
DHCP requests when configured both using "dhcp-client-identifier" and
"hardware ethernet".

Impact
=3D=3D=3D=3D=3D=3D

A remote attacker might send a specially crafted request to dhcpd,
possibly resulting in a Denial of Service (daemon crash).

Workaround
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

There is no known workaround at this time.

Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

All ISC DHCP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose =3Dnet-misc/dhcp-3.1.2_p1

References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

  [ 1 ] CVE-2009-1892
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=3DCVE-2009-1892

Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  http://security.gentoo.org/glsa/glsa-200908-08.xml

Concerns?
=3D=3D=3D=3D=3D=3D=3D=3D=3D

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=3D=3D=3D=3D=3D=3D=3D

Copyright 2009 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

http://creativecommons.org/licenses/by-sa/2.5

--Sig_/2fuUaU9u.7UPIKTZM_yNTds
Content-Type: application/pgp-signature; name=signature.asc
Content-Disposition: attachment; filename=signature.asc

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.11 (GNU/Linux)

iEYEARECAAYFAkqLHyYACgkQk+oqhfPAZGlUegCaAkhFjF2LBwpMRYhmcPWGnCZR
plgAn0x28Wu22TLm8tP0e1QHjIA8t+XU
=CpGv
-----END PGP SIGNATURE-----

--Sig_/2fuUaU9u.7UPIKTZM_yNTds--