[RHSA-2003:034-01] Updated dhcp packages fix possible packet storm

From: bugzilla@redhat.com
Date: 03/31/03

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    From: bugzilla@redhat.com
    Date: Mon, 31 Mar 2003 12:21 -0500
    To: redhat-watch-list@redhat.com, redhat-announce-list@redhat.com

                       Red Hat Security Advisory

    Synopsis: Updated dhcp packages fix possible packet storm
    Advisory ID: RHSA-2003:034-01
    Issue date: 2003-03-31
    Updated on: 2003-03-31
    Product: Red Hat Linux
    Cross references:
    Obsoletes: RHSA-2003:011
    CVE Names: CAN-2003-0039

    1. Topic:

    A potential remote denial of service attack affects version 3 of the ISC
    DHCPD server. This advisory provides fixed packages for Red Hat Linux 8.0.

    2. Relevant releases/architectures:

    Red Hat Linux 8.0 - i386

    3. Problem description:

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

    Florian Lohoff reported that the ISC dhcrelay (dhcp-relay) in 3.0rc9 and
    earlier allows remote attackers to cause a denial of service (packet
    storm) by constructing a malicious BOOTP packet that is forwarded to a
    broadcast MAC address, causing an infinite loop.

    Red Hat Linux 8.0 shipped with a version of DHCP that is vulnerable to
    this issue. Other distributions of Red Hat Linux and Red Hat Linux
    Advanced Server are based on version 2 of DHCP, and are not vulnerable to
    this issue.

    These erratum packages contain a patch that introduces a new command line
    switch to dhcrelay, "-c maxcount". This switch can be used to limit the
    hopcount and so avoid any infinite loops. We advise users of dhcp-relay to
    specify a small number for the maximum hop count; for example "dhcrelay -c 10".

    4. Solution:

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

    To update all RPMs for your particular architecture, run:

    rpm -Fvh [filenames]

    where [filenames] is a list of the RPMs you wish to upgrade. Only those
    RPMs which are currently installed will be updated. Those RPMs which are
    not installed but included in the list will not be updated. Note that you
    can also use wildcards (*.rpm) if your current directory *only* contains the
    desired RPMs.

    Please note that this update is also available via Red Hat Network. Many
    people find this an easier way to apply updates. To use Red Hat Network,
    launch the Red Hat Update Agent with the following command:


    This will start an interactive process that will result in the appropriate
    RPMs being upgraded on your system.

    5. RPMs required:

    Red Hat Linux 8.0:



    6. Verification:

    MD5 sum Package Name
    c96c16fa9605745ca94d2acafea2862a 8.0/en/os/SRPMS/dhcp-3.0pl1-26.src.rpm
    e9ef52a8859a1b9776ef9276495dea35 8.0/en/os/i386/dhclient-3.0pl1-26.i386.rpm
    5a11c839e1824a5eecb71d098007fed8 8.0/en/os/i386/dhcp-3.0pl1-26.i386.rpm
    3f6de3a2cbe96c7b8402e2fcb90fe0a8 8.0/en/os/i386/dhcp-devel-3.0pl1-26.i386.rpm

    These packages are GPG signed by Red Hat for security. Our key is
    available at http://www.redhat.com/solutions/security/news/publickey/

    You can verify each package with the following command:
        rpm --checksig -v <filename>

    If you only wish to verify that each package has not been corrupted or
    tampered with, examine only the md5sum with the following command:
        md5sum <filename>

    7. References:


    8. Contact:

    The Red Hat security contact is <security@redhat.com>. More contact
    details at http://www.redhat.com/solutions/security/news/contact/

    Copyright 2003 Red Hat, Inc.

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