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From: Mandrake Linux Security Team (securitylinux-mandrake.com)
Date: Thu May 09 2002 - 11:41:48 CDT

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    ________________________________________________________________________

                    Mandrake Linux Security Update Advisory
    ________________________________________________________________________

    Package name: iptables/kernel
    Advisory ID: MDKSA-2002:030
    Date: May 9th, 2002
    Affected versions: 8.0, 8.1, 8.2
    ________________________________________________________________________

    Problem Description:

     A problem was discovered with Netfilter Network Address Translation
     (NAT) capabilities. It was found that iptables can leak information
     about how port forwarding is accomplished in unfiltered ICMP packets.
     When a NAT rule applies to the first packet of a connection, which
     subsequently causes the system to generate an ICMP error message, the
     ICMP error message is transmitted including the translated address.
     This information gives the IP address of the system to which the
     connection would have been forwarded had the error message not been
     generated, exposing information about the netfilter configuration and
     the network topology.

     There is currently no clean fix for this problem, but a fix is being
     worked on. In the meantime, if you use the NAT capabilities of
     iptables, you can protect yourself by filtering out untracked local
     ICMP packets using the following iptables command:

       iptables -A OUTPUT -m state -p icmp --state INVALID -j DROP

     All kernel patches from iptables < 1.2.6a are vulnerable. All kernel
     versions from 2.4.4 and up to (at least) 2.4.19-pre6 use a vulnerable
     version. Thanks to Philippe Biondi for discovering this problem.
    ________________________________________________________________________

    References:

      http://online.securityfocus.com/archive/1/271530/2002-05-06/2002-05-12/0
    ________________________________________________________________________

    Updated Packages:

      None currently available.
    ________________________________________________________________________

    Bug IDs fixed (see https://qa.mandrakesoft.com for more information):

    ________________________________________________________________________

    To upgrade automatically, use MandrakeUpdate. The verification of md5
    checksums and GPG signatures is performed automatically for you.

    If you want to upgrade manually, download the updated package from one
    of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm". A list of
    FTP mirrors can be obtained from:

      http://www.mandrakesecure.net/en/ftp.php

    Please verify the update prior to upgrading to ensure the integrity of
    the downloaded package. You can do this with the command:

      rpm --checksig <filename>

    All packages are signed by MandrakeSoft for security. You can obtain
    the GPG public key of the Mandrake Linux Security Team from:

      https://www.mandrakesecure.net/RPM-GPG-KEYS

    Please be aware that sometimes it takes the mirrors a few hours to
    update.

    You can view other update advisories for Mandrake Linux at:

      http://www.mandrakesecure.net/en/advisories/

    MandrakeSoft has several security-related mailing list services that
    anyone can subscribe to. Information on these lists can be obtained by
    visiting:

      http://www.mandrakesecure.net/en/mlist.php

    If you want to report vulnerabilities, please contact

      securitylinux-mandrake.com
    ________________________________________________________________________

    Type Bits/KeyID Date User ID
    pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
      <securitylinux-mandrake.com>

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