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SuSE: remote command execution in lukemftp

Lukemftp is a comfortable ftp client from NetBSD. A buffer overflow could be triggered by an malicious ftp server while the client parses the PASV ftp command. An attacker who control an ftp server to which a client using lukemftp is connected can gain remote access to the clients machine with the privileges of the user running lukeftp. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                lukemftp, nkitb, nkitserv
        Announcement-ID:        SuSE-SA:2002:018
        Date:                   Wednesday, May 15th 2002 12:30 MEST
        Affected products:      6.4, 7.0, 7.1, 7.2, 7.3, 8.0
                                SuSE eMail Server III
                                SuSE Linux Database Server
                                SuSE Firewall Adminhost VPN
                                SuSE Linux Live-CD for Firewall
                                SuSE Linux Admin-CD for Firewall
                                SuSE Linux Connectivity Server
                                SuSE Linux Enterprise Server 7
                                SuSE Linux Enterprise Server for S/390
        Vulnerability Type:     remote command execution
        Severity (1-10):        3
        SuSE default package:   yes
        Other affected systems: all systems using lukemftp

    Content of this advisory:
        1) security vulnerability resolved: buffer overflow while parsing PASV
                                            command
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds
        3) standard appendix (further information)

______________________________________________________________________________

1)  problem description, brief discussion, solution, upgrade information

    Lukemftp (ftp(1), /usr/bin/ftp, /usr/bin/pftp) is a compfortable ftp
    client from NetBSD.
    A buffer overflow could be triggered by an malicious ftp server while the
    client parses the PASV ftp command. An attacker who control an ftp server
    to which a client using lukemftp is connected can gain remote access to
    the clients machine with the privileges of the user running lukeftp.

    The lukemftp RPM package is installed by default.
    You need to update the package, as no temporary workaround is possbible.

    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.



    i386 Intel Platform:

    SuSE-8.0
      ftp://ftp.suse.com/pub/suse/i386/update/8.0/n1/lukemftp-1.5-249.i386.rpm
      0ae28f7ca49157bfa5783626d3e82cef
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/lukemftp-1.5-249.src.rpm
      d9fc530c338ea2de122b6a4a1f89a627

    SuSE-7.3
      ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/lukemftp-1.5-256.i386.rpm
      aeb64a5ba64b5b334dfcf244423a9809
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/lukemftp-1.5-256.src.rpm
      cc94b939696c76cda0fec683d12ff384

    SuSE-7.2
      ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/lukemftp-1.5-256.i386.rpm
      94812aeb3b164a67b0c85b0c9a61a450
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/lukemftp-1.5-256.src.rpm
    5cd6642505a68be70ce9eac3ba5dd311

    SuSE-7.1
      ftp://ftp.suse.com/pub/suse/i386/update/7.1/n1/lukemftp-1.5-251.i386.rpm
      836df6046ce81fcc82e9939fde5003d1
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/lukemftp-1.5-251.src.rpm
      788bc38fed7b486e857b5d780451b7a7

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/i386/update/7.0/a1/nkitb-2002.5.8-0.i386.rpm
      e6199c28c700461a7ae10c3f7fba73a8
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/nkitb-2002.5.8-0.src.rpm
      e1c6379846842ea62a5c484167102cae

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/nkitserv-2002.5.8-0.i386.rpm
      50bb6a7ae3f450ad530ad92ae8dad3e1

    SuSE-6.4
      ftp://ftp.suse.com/pub/suse/i386/update/6.4/a1/nkitb-2002.5.9-0.i386.rpm
      6950a272cf3a30a02860cf179387a9e8
    source rpm:
      ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/nkitb-2002.5.9-0.src.rpm
      09d7ac9ba5e1420eeddb016a6d812067



    Sparc Platform:

    SuSE-7.3
      ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/lukemftp-1.5-77.sparc.rpm
      295d90e7bfeb94f27f542616e016bd65
    source rpm:
      ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/lukemftp-1.5-77.src.rpm
    42e213cfc930e0a00aa871e9996d3cba

    SuSE-7.1
      ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n1/lukemftp-1.5-76.sparc.rpm
      50fc0f99b42347aee746450624ed4817
    source rpm:
      ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/lukemftp-1.5-76.src.rpm
      01cdff7ff9f908466b8d3269fe4529c5

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/sparc/update/7.0/a1/nkitb-2002.5.8-0.sparc.rpm
      210230a1a085af9f777f047a9edfa9f5
    source rpm:
      ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/nkitb-2002.5.8-0.src.rpm
      b0e476e5ba4e9211cab20442f35b49d8

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/nkitserv-2002.5.8-0.sparc.rpm
      70b063b1901c8655a23b008cc6ef4036



    AXP Alpha Platform:

    SuSE-7.1
      ftp://ftp.suse.com/pub/suse/axp/update/7.1/n1/lukemftp-1.5-89.alpha.rpm
      27c6ca255ef42c7e6851f309d6474fcd
    source rpm:
      ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/lukemftp-1.5-89.src.rpm
      fdc27d3abae5bf6dfcd06907d2afc278

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/axp/update/7.0/a1/nkitb-2002.5.8-0.alpha.rpm
      2c397f234a2326baba98a4da8dff601a
    source rpm:
      ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/nkitb-2002.5.8-0.src.rpm
      437a49653372205c4218e7283422fd6b

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/nkitserv-2002.5.8-0.alpha.rpm
      e2943d09b3bf82883bfd62aff74e500b

    SuSE-6.4
      ftp://ftp.suse.com/pub/suse/axp/update/6.4/a1/nkitb-2002.5.9-0.alpha.rpm
      33b7a7b2f81dc78035450c0643786c83
    source rpm:
      ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/nkitb-2002.5.9-0.src.rpm
      60960a0129207b317fc22089f6203589



    PPC Power PC Platform:

    SuSE-7.3
      ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/lukemftp-1.5-154.ppc.rpm
      fd6bc23e95cd7a19283dd4067f376bb3
    source rpm:
      ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/lukemftp-1.5-154.src.rpm
      bb301c6487a09a2b3d82ce9b000b8f69

    SuSE-7.1
      ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n1/lukemftp-1.5-150.ppc.rpm
      023a43cba32d976d0a5665365242647b
    source rpm:
      ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/lukemftp-1.5-150.src.rpm
      53f38c8f4a3205b3bedbc76b209d177b

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/ppc/update/7.0/a1/nkitb-2002.5.8-0.ppc.rpm
      101d5af039c262f7b7e7d50598fa064c
    source rpm:
      ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/nkitb-2002.5.8-0.src.rpm
      ed39244bcb57fad7b92287f5c9d26e3d

    SuSE-7.0
      ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/nkitserv-2002.5.8-0.ppc.rpm
      b6146585ab16d1d507e04f066f21f5d6

    SuSE-6.4
      ftp://ftp.suse.com/pub/suse/ppc/update/6.4/a1/nkitb-2002.5.9-0.ppc.rpm
      10b66b58b887a1899df7e16b15689bfb
    source rpm:
      ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/nkitb-2002.5.9-0.src.rpm
      954dcd26ef2eb777e737621927f98835


______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

  - imap
    A bug report about a buffer overflow in the RFC1730 code of the wu-imap
    eMail server was published. SuSE Linux' imap packages were compiled
    without RFC1730 support, so SuSE Linux is not vulnerable to this bug per
    default.

  - dhcp
    A format string bug was found in the DynamicDNS (DDNS) code of ISC's
    DHCP server software. New RPMs are currently being build.

  - imlib
    Due to packaging failures we have to re-release the imlib packages
    which should be available within the next days. This update addresses
    missing dependencies and affects applications like xcdroast.

  - perl-Digest-MD5
    A bug was found in the UTF8 interaction between perl and perl-Digest-MD5
    which leads into failures while verifying the MD5 hash.
    New RPMs are currently being build.

______________________________________________________________________________

3)  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 uninstalled 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 toplevel 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 annoucements 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 .
    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 cleartext 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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Bye,
     Thomas
-- 
  Thomas Biege 
  SuSE Linux AG,Deutschherrnstr. 15-19,90429 Nuernberg
  Function: Security Support & Auditing
  "lynx -source http://www.suse.de/~thomas/contact/thomas.asc | pgp -fka"
  Key fingerprint = 51 AD B9 C7 34 FC F2 54  01 4A 1C D4 66 64 09 83
-- 
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A tool for converting and editing videos.

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Project Spotlight

Kid3

An efficient tagger for MP3, Ogg/Vorbis, and FLAC files.