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SuSE Security Announcement: rsync

Jan 25, 2002, 18:16 (0 Talkback[s])

                        SuSE Security Announcement

        Package:                rsync
        Announcement-ID:        SuSE-SA:2002:004
        Date:                   Fri Jan 25 17:00:00 CET 2002
        Affected SuSE versions: 6.4, 7.0, 7.1, 7.2, 7.3
        Vulnerability Type:     remote command executionn
        Severity (1-10):        7
        SuSE default package:   no
        Other affected systems: All systems with vulnerable rsync.

    Content of this advisory:
        1) security vulnerability resolved: rsync negative array indexing
           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

    The rsync program allows users and administrators to synchronize files and
    whole directory structures on different machines. It is common practise
    to allow remote users to mirror ftp servers via anonymous rsync access.
    There exist several signedness bugs within the rsync program which allow
    remote attackers to write 0-bytes to almost arbitrary stack-locations,
    therefore being able to control the programflow and obtaining a shell
    remotely. These bugs have been fixed.

    It is recommended (also stated in the rsync documentation) to use the
    "use chroot" option in rsyncd's configuration file (/etc/rsyncd.conf)
    to limit the impact of a possible attack. Since this workaround does
    not completely solve the security problem, we recommend to update the
    package as described below.

    We want to express our gratitude to Andrew Tridgell and Martin Pool,
    the rsync authors and maintainers, for their excellent cooperation in
    this matter.

    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.

    To be sure that the update takes effect, kill any existing instances of
    the rsync-program.
    In case you run rsync via the inetd superserver, you do not need to
    restart any of your services. Inetd will automatically use the new binary.
    If you used run your rsync-service with the "rsync --daemon" command,
    restart your rsync with "rync --daemon" again, this time using the new
    binary.


    i386 Intel Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n2/rsync-2.4.6-288.i386.rpm
      ce6d9226a8a9a5644ece29926c1f51d7
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/rsync-2.4.6-288.src.rpm
      0e354408f232b25fe0089b97073009a3

    SuSE-7.2
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/rsync-2.4.6-289.i386.rpm
      1ff42b8149e21644d23fe71c40a3ec5a
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/rsync-2.4.6-289.src.rpm
      83407b4dfad94d21af60ba3e8025e6cd

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/rsync-2.4.6-288.i386.rpm
      26533f97af4474b450ad43a171c5571f
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/rsync-2.4.6-288.src.rpm
      dcd1345446871320962e91d979ddb25b

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/rsync-2.3.2-124.i386.rpm
      f16f81e5a0a11ba951b6f923cbae2abd
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/rsync-2.3.2-124.src.rpm
      cd36ce735b4ca91f92fc2f3c7603037f

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/rsync-2.3.2-123.i386.rpm
      c9330c9123757f89ed94382874122c82
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/rsync-2.3.2-123.src.rpm
      d97478d6fe9f2419b8700c52be4d888a


    Sparc Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n2/rsync-2.4.6-135.sparc.rpm
      669f52233aed0766dd72788741691558
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/rsync-2.4.6-135.src.rpm
      85ddaa9518d19f6341a68ce254668f0b

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/rsync-2.4.6-135.sparc.rpm
      d68ebcdba8caa16360e225fc9d28dc54
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/rsync-2.4.6-135.src.rpm
      b9f1f43d0248b763aef46bd610233285

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/n1/rsync-2.3.2-5.sparc.rpm
      50b9cefa5f4bf86fc1e20184c15fb542
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/rsync-2.3.2-5.src.rpm
      ffbc3ff43c339cbbe12317bb98587df3


    AXP Alpha Platform:

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/rsync-2.4.6-123.alpha.rpm
      3b602bd23179a7b6ce162d2d377394af
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/rsync-2.4.6-123.src.rpm
      65f9d53cb48b8456466a27d9cde04339

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/rsync-2.3.2-30.alpha.rpm
      2056422feb3b2b53285413ca746f2f4e
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/rsync-2.3.2-30.src.rpm
      88c3a630df0e3073a8be55b0008371a0

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/rsync-2.3.2-31.alpha.rpm
      18ea59b5c4d4641b62cef9c11f535ae8
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/rsync-2.3.2-31.src.rpm
      091659d90d3e079c0f8d4518c2c42f9f

    Power PC Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n2/rsync-2.4.6-150.ppc.rpm
      f5576fca06f5d22b1410aaba399e0791
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/rsync-2.4.6-150.src.rpm
      1baeeffafe1c7dd75189cbfe704bddf0

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/rsync-2.4.6-151.ppc.rpm
      04102efb5a83b5190fe6b02146ec522b
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/rsync-2.4.6-151.src.rpm
      4a21e9f5b36f6767436c6ea92f5d17e7

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/rsync-2.3.2-133.ppc.rpm
      897e0010ccf09c85a8c8797dc77394e1
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/rsync-2.3.2-133.src.rpm
      7ff150ba5f39ab527aa67308154273e2

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/rsync-2.3.2-133.ppc.rpm
      65ac31f12bacb9284fd2286aec7beab0
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/rsync-2.3.2-133.src.rpm
      4b43552a939f080a3e93fe65a88bd139



____________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - pine
    The popular mail client "pine" was found vulnerable to an attack where
    shell metacharacters inside an URL could be used to execute arbitrary
    commands if pine passes the URL to an external viewer on the
    commandline. The pine packages on SuSE products are not vulnerable to
    this weakness because they contain a patch that works around this
    problem since it is not new.


    - xchat
    We are working on updates for the xchat packages in the SuSE Linux
    7.0 and 7.1 distributions that are vulnerable to an encoding bug
    while receiving and decoding ctcp datagrams. This bug can lead
    an xchat IRC client to execute IRC protocol specific commands to an
    IRC server such as channel mode changes.

____________________________________________________________________________

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-subscribe@suse.com.

    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
                suse-security-announce-subscribe@suse.com.

    For general information or the frequently asked questions (faq)
    send mail to:
        suse-security-info@suse.com or
        suse-security-faq@suse.com respectively.

    =====================================================================
    SuSE's security contact is security@suse.com or security@suse.de.
    The security@suse.de 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 GmbH 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 security@suse.de
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key build@suse.de

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