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                   Red Hat Security Advisory

Synopsis:          Moderate: dhcp security update
Advisory ID:       RHSA-2005:212-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2005-212.html
Issue date:        2005-04-12
Updated on:        2005-04-12
Product:           Red Hat Enterprise Linux
CVE Names:         CAN-2004-1006
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1. Summary:

An updated dhcp package that fixes a string format issue is now available
for Red Hat Enterprise Linux 2.1.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386

3. Problem description:

The dhcp package provides the ISC Dynamic Host Configuration Protocol
(DHCP) server and relay agent, dhcpd. DHCP is a protocol that allows
devices to get their own network configuration information from a server.

A bug was found in the way dhcpd logs error messages.  A malicious DNS
server could send a carefully crafted DNS reply and cause dhcpd to crash or
possibly execute arbitrary code. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CAN-2005-0446 to this issue. 

All users of dhcp should upgrade to this updated package, which contains a
backported patch and is not vulnerable to this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.  Use Red Hat
Network to download and update your packages.  To launch the Red Hat
Update Agent, use the following command:

    up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

    http://www.redhat.com/docs/manuals/enterprise/

5. Bug IDs fixed (http://bugzilla.redhat.com/):

149513 - CAN-2004-1006 dhcp string format issue

6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/dhcp-2.0pl5-9.src.rpm
927826387feaf4ae2adde7202a94379e  dhcp-2.0pl5-9.src.rpm

i386:
0eb5f32af8caf92da9b1b9cb9a06d690  dhcp-2.0pl5-9.i386.rpm

ia64:
aea9d86d108f3e113816073c60cf9d67  dhcp-2.0pl5-9.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/dhcp-2.0pl5-9.src.rpm
927826387feaf4ae2adde7202a94379e  dhcp-2.0pl5-9.src.rpm

ia64:
aea9d86d108f3e113816073c60cf9d67  dhcp-2.0pl5-9.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/dhcp-2.0pl5-9.src.rpm
927826387feaf4ae2adde7202a94379e  dhcp-2.0pl5-9.src.rpm

i386:
0eb5f32af8caf92da9b1b9cb9a06d690  dhcp-2.0pl5-9.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1006

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2005 Red Hat, Inc.

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