Articles / SuSE: New ipsec-tools packa…

SuSE: New ipsec-tools packages fix remote denial of service

Racoon is a ISAKMP key management daemon used in IPsec setups. Sebastian Krahmer of the SUSE Security Team audited the daemon and found that it handles certain ISAKMP messages in a slightly wrong way, so that remote attackers can crash it via malformed ISAKMP packages. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                ipsec-tools
        Announcement-ID:        SUSE-SA:2005:020
        Date:                   Thu, 31 Mar 2005 13:00:00 +0000
        Affected products:      9.1, 9.2
                                SUSE Linux Enterprise Server 9
                                Novell Linux Desktop 9
        Vulnerability Type:     remote denial of service
        Severity (1-10):        6
        SUSE default package:   no
        Cross References:       CAN-2005-0398

    Content of this advisory:
        1) security vulnerability resolved:
             security problems in racoon
           problem description
        2) solution/workaround
        3) special instructions and notes
        4) package location and checksums
        5) pending vulnerabilities, solutions, workarounds:
            none

        6) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion

    Racoon is a ISAKMP key management daemon used in IPsec setups.

    Sebastian Krahmer of the SUSE Security Team audited the daemon and
    found that it handles certain ISAKMP messages in a slightly wrong way,
    so that remote attackers can crash it via malformed ISAKMP packages.

    This update fixes this problem.

    This is tracked by the Mitre CVE ID CAN-2005-0398.


2) solution/workaround

    None. Please install the updated packages.

3) special instructions and notes

    Please restart the ipsec daemon, by running as root:

    	/usr/sbin/rcracoon try-restart

4) package location and checksums

    Please download the update package for your distribution and verify its
    integrity by the methods listed in section 3) of this announcement.
    Then, install the package using the command "rpm -Fhv file.rpm" to apply
    the update.
    Our maintenance customers are being notified individually. The packages
    are being offered to install from the maintenance web.


    x86 Platform:

    SUSE Linux 9.2:
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/i586/ipsec-tools-0.4rc1-3.2.i586.rpm
           396fbabba87d4da66d0a5a8bf004061a

    SUSE Linux 9.1:
    ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/ipsec-tools-0.3.3-1.6.i586.rpm
           a2b518867110fcb0a386472d0cfc76d7
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/ipsec-tools-0.3.3-1.6.src.rpm
           177a7c30baeba235ae6feeb89c962153

    x86-64 Platform:

    SUSE Linux 9.2:
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/x86_64/ipsec-tools-0.4rc1-3.2.x86_64.rpm
           a4182f836f5c4af6b2fb57da4c57c134
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.2/rpm/src/ipsec-tools-0.4rc1-3.2.src.rpm
           7f396a2b8bfb0f99f9dede830e9ba168

    SUSE Linux 9.1:
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/x86_64/ipsec-tools-0.3.3-1.6.x86_64.rpm
           fd1eb56dcad51c50944bb3a10ee3f23b
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/x86_64/update/9.1/rpm/src/ipsec-tools-0.3.3-1.6.src.rpm
           a2a311f0e24759afa7ba3412631cf83a


______________________________________________________________________________

5)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    none

______________________________________________________________________________

6)  standard appendix: authenticity verification, additional information

  - Package authenticity verification:

    SUSE update packages are available on many mirror ftp servers all over
    the world. While this service is being considered valuable and important
    to the free and open source software community, many users wish to be
    sure about the origin of the package and its content before installing
    the package. There are two verification methods that can be used
    independently from each other to prove the authenticity of a downloaded
    file or rpm package:
    1) md5sums as provided in the (cryptographically signed) announcement.
    2) using the internal gpg signatures of the rpm package.

    1) execute the command
        md5sum 
       after you downloaded the file from a SUSE ftp server or its mirrors.
       Then, compare the resulting md5sum with the one that is listed in the
       announcement. Since the announcement containing the checksums is
       cryptographically signed (usually using the key security@suse.de),
       the checksums show proof of the authenticity of the package.
       We disrecommend to subscribe to security lists which cause the
       email message containing the announcement to be modified so that
       the signature does not match after transport through the mailing
       list software.
       Downsides: You must be able to verify the authenticity of the
       announcement in the first place. If RPM packages are being rebuilt
       and a new version of a package is published on the ftp server, all
       md5 sums for the files are useless.

    2) rpm package signatures provide an easy way to verify the authenticity
       of an rpm package. Use the command
        rpm -v --checksig 
       to verify the signature of the package, where  is the
       filename of the rpm package that you have downloaded. Of course,
       package authenticity verification can only target an un-installed rpm
       package file.
       Prerequisites:
        a) gpg is installed
        b) The package is signed using a certain key. The public part of this
           key must be installed by the gpg program in the directory
           ~/.gnupg/ under the user's home directory who performs the
           signature verification (usually root). You can import the key
           that is used by SUSE in rpm packages for SUSE Linux by saving
           this announcement to a file ("announcement.txt") and
           running the command (do "su -" to be root):
            gpg --batch; gpg < announcement.txt | gpg --import
           SUSE Linux distributions version 7.1 and thereafter install the
           key "build@suse.de" upon installation or upgrade, provided that
           the package gpg is installed. The file containing the public key
           is placed at the top-level directory of the first CD (pubring.gpg)
           and at ftp://ftp.suse.com/pub/suse/pubring.gpg-build.suse.de .


  - SUSE runs two security mailing lists to which any interested party may
    subscribe:

    suse-security@suse.com
        -   general/linux/SUSE security discussion.
            All SUSE security announcements are sent to this list.
            To subscribe, send an email to
                .

    suse-security-announce@suse.com
        -   SUSE's announce-only mailing list.
            Only SUSE's security announcements are sent to this list.
            To subscribe, send an email to
                .

    For general information or the frequently asked questions (faq)
    send mail to:
         or
         respectively.

    =====================================================================
    SUSE's security contact is  or .
@suse.de>.
    The  public key is listed below.
    =====================================================================
______________________________________________________________________________

    The information in this advisory may be distributed or reproduced,
    provided that the advisory is not modified in any way. In particular,
    it is desired that the clear-text signature shows proof of the
    authenticity of the text.
    SUSE Linux AG makes no warranties of any kind whatsoever with respect
    to the information contained in this security advisory.

Type Bits/KeyID    Date       User ID
pub  2048R/3D25D3D9 1999-03-06 SuSE Security Team 
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key 

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