A new update is available for Red Hat Enterprise Linux. Here the announcement:

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Red Hat Security Advisory

Synopsis: Critical: dhcp security update
Advisory ID: RHSA-2009:1154-02
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2009-1154.html
Issue date: 2009-07-14
CVE Names: CVE-2009-0692 CVE-2009-1893
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1. Summary:

Updated dhcp packages that fix two security issues are now available for
Red Hat Enterprise Linux 3.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Description:

The Dynamic Host Configuration Protocol (DHCP) is a protocol that allows
individual devices on an IP network to get their own network configuration
information, including an IP address, a subnet mask, and a broadcast
address.

The Mandriva Linux Engineering Team discovered a stack-based buffer
overflow flaw in the ISC DHCP client. If the DHCP client were to receive a
malicious DHCP response, it could crash or execute arbitrary code with the
permissions of the client (root). (CVE-2009-0692)

An insecure temporary file use flaw was discovered in the DHCP daemon's
init script ("/etc/init.d/dhcpd"). A local attacker could use this flaw to
overwrite an arbitrary file with the output of the "dhcpd -t" command via
a symbolic link attack, if a system administrator executed the DHCP init
script with the "configtest", "restart", or "reload" option.
(CVE-2009-1893)

Users of DHCP should upgrade to these updated packages, which contain
backported patches to correct these issues.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

507717 - CVE-2009-0692 dhclient: stack overflow leads to arbitrary code execution as root
510024 - CVE-2009-1893 dhcp: insecure temporary file use in the dhcpd init script

6. Package List:

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

ia64:
dhclient-3.0.1-10.2_EL3.ia64.rpm
dhcp-3.0.1-10.2_EL3.ia64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ia64.rpm
dhcp-devel-3.0.1-10.2_EL3.ia64.rpm

ppc:
dhclient-3.0.1-10.2_EL3.ppc.rpm
dhcp-3.0.1-10.2_EL3.ppc.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ppc.rpm
dhcp-devel-3.0.1-10.2_EL3.ppc.rpm

s390:
dhclient-3.0.1-10.2_EL3.s390.rpm
dhcp-3.0.1-10.2_EL3.s390.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.s390.rpm
dhcp-devel-3.0.1-10.2_EL3.s390.rpm

s390x:
dhclient-3.0.1-10.2_EL3.s390x.rpm
dhcp-3.0.1-10.2_EL3.s390x.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.s390x.rpm
dhcp-devel-3.0.1-10.2_EL3.s390x.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

ia64:
dhclient-3.0.1-10.2_EL3.ia64.rpm
dhcp-3.0.1-10.2_EL3.ia64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ia64.rpm
dhcp-devel-3.0.1-10.2_EL3.ia64.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/dhcp-3.0.1-10.2_EL3.src.rpm

i386:
dhclient-3.0.1-10.2_EL3.i386.rpm
dhcp-3.0.1-10.2_EL3.i386.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.i386.rpm
dhcp-devel-3.0.1-10.2_EL3.i386.rpm

ia64:
dhclient-3.0.1-10.2_EL3.ia64.rpm
dhcp-3.0.1-10.2_EL3.ia64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.ia64.rpm
dhcp-devel-3.0.1-10.2_EL3.ia64.rpm

x86_64:
dhclient-3.0.1-10.2_EL3.x86_64.rpm
dhcp-3.0.1-10.2_EL3.x86_64.rpm
dhcp-debuginfo-3.0.1-10.2_EL3.x86_64.rpm
dhcp-devel-3.0.1-10.2_EL3.x86_64.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=CVE-2009-0692
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1893
http://www.redhat.com/security/updates/classification/#critical

8. Contact:

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

Copyright 2009 Red Hat, Inc.
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