______________________________________________________________________________

                        SuSE Security Announcement

        Package:                imlib
        Announcement-ID:        SuSE-SA:2002:015
        Date:                   Tuesday, May 7th 2002 11:30 MEST
        Affected products:      6.4, 7.0, 7.1, 7.2, 7.3, 8.0
        Vulnerability Type:     remote privilege escalation
        Severity (1-10):        3
        SuSE default package:   yes
        Other affected systems: all systems/applications using imlib

    Content of this advisory:
        1) security vulnerability resolved: imlib fallback and Denial-of-Service
           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 imlib library can be used by X11 applications to handle various
    kinds of image data.

    Imlib could, under certain circumstances, revert to using a netpbm
    library which is well known to have security problems and should not
    be used for handling untrusted data. Furthermore a heap corruption
    could occur in the imlib code.
    An attacker could send a maliciously formated image file to trigger
    a Denial-of-Service attack or even execute arbitrary code on the
    victim's machine.
    Thanks go to Al Viro and Alan Cox who discovered these bugs.

    The imlib RPM package is installed by default and affects all applications
    linked against imlib, like imager viewers, browsers, mail clients and
    so on.

    About 140 applications shipped with the SuSE Linux distribution depend
    on imlib. You need to update your system, as no temporary workaround is
    possbible.

    Please run ldconfig(8) as root after updating imlib and restart all
    applications using imlib.


    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
            9137d95a9205a335871a71341c2c70b4
    SuSE-8.0
            4abd84a67aacb2c2fa21582e228e6a1d
    SuSE-8.0
            43103d0ff1e60f008499a69519d722d3
    SuSE-8.0
            02df11424f082e4aed1c93527f7bab69
    SuSE-8.0
            7680c38f5fef811bc96ff2fc00baafad
    SuSE-8.0
            bb449e5db3bf0827168b78d7636accac
    source rpm:
            d7cb0ddd0e18d645191f967b5b6e8109


    SuSE-7.3
            b114e4ea9babf4ac8bd241674b0be0fd
    SuSE-7.3
            7b3cd1c19161ed500bc4a0306eb66d0c
    SuSE-7.3
            41af6a469645a4ce4399935604cbf4c0
    source rpm:
            1839a719883e4aa5e543ee1bd22dc780


    SuSE-7.2
            9ec9fb90418a6ba76432334cb7e15bb8
    SuSE-7.2
            584e88a451341910524740cc54ca9c64
    SuSE-7.2
            c8c25f5396d565f75f68d48d7911813b
    source rpm:
            a5691ba54118a52454d394e346a6b8b4


    SuSE-7.1
            dc9d57492cd4faa497e23e14fcf5e57b
    SuSE-7.1
            58f03af3039c42db5b5a9d1a6acd9c27
    SuSE-7.1
            b82aa8abda460e45094fb4a0d683971f
    source rpm:
            f16db540325f4626aa5fda6ab5aa196b


    SuSE-7.0
            c089d699c31addadba09fd967677e535
    SuSE-7.0
            ee3c4bf8ab5e7068afcfb7160c38653f
    SuSE-7.0
            253759ffd47eb19831e61c52673ebc6f
    source rpm:
            2bb8b096627c72e25949d4e22fc26c3a


    SuSE-6.4
            b3175095dade1c545822b42707a99820
    SuSE-6.4
            a54bfa0d5b6333c20497dfd6ae1c65f6
    SuSE-6.4
            6d5815e9cfc1e9020dd758fcf3e15f0b
    source rpm:
            ce83d062fb32cf34ed6921490c732a51



    Sparc Platform:

    SuSE-7.3
            58f0df8b16d05b7b28d919c53b20ddfd
    SuSE-7.3
            92c1e1a5a67b0a73197f793101af5955
    SuSE-7.3
            744db88a54bcff79068a7b2392e34fc2
    source rpm:
            fa4c576fea3185bc7624e50620dbaaf5


    SuSE-7.1
            dc3336004bc77ceca74035cb05b050f9
    SuSE-7.1
            a27820491016c5ff1fac5706b7042158
    SuSE-7.1
            b8b28901c088bc6763f462753ca58b7c
    source rpm:
            7605166c8ee6fa6439ade68e0d67c5c6


    SuSE-7.0
            8b1e28d9aa91061aed4569015e058fac
    SuSE-7.0
            01c5dae090bfe25d641d3389a11c16c2
    SuSE-7.0
            3be7654afc64fb5a10c145f67dce9ba3
    source rpm:
            6531693204e86106ceee748758038a07



    AXP Alpha Platform:

    SuSE-7.1
            a84242de9afeec0b77f9d85b54f51f5b
    SuSE-7.1
            a2829f4eba557fbc3160b6b4ffec0ac5
    SuSE-7.1
            691b3d75dab0a3487b9f57c9b3501b17
    source rpm:
            58697086bf51f5231a1708765db8312c


    SuSE-7.0
            fbbf3f167844f0b046aafc14fed3b50e
    SuSE-7.0
            e5a8c05ca99ce4b38de47b35258423d7
    SuSE-7.0
            26cc11948b4d61d6e4c0aa35472d2d7d
    source rpm:
            90df4b7a6860281ad6130b09e7e634e3


    SuSE-6.4
            2b231d47fed0f5ac88299abbb6abb1cd
    SuSE-6.4
            99b4a22d820a3d846fc1bf0ca94843e4
    SuSE-6.4
            a7e9b77c92c28fe6bd07d4d8634a5253
    source rpm:
            11a996b48ee33c34b34acffad3a2a56c



    PPC Power PC Platform:

    SuSE-7.3
            f9c093c06636b62507846c6679e1e86d
    SuSE-7.3
            973e484ba78847b5c47d5d6ef3972f56
    SuSE-7.3
            e06812ab04e4cbdc781d8e8d29dc3372
    source rpm:
            8f85b9a40d36d328deb20b3255ddc05c


    SuSE-7.1
            4a22c12194b6f1b80123a3466fe944c3
    SuSE-7.1
            85139eb233c567783c053f110baadb66
    SuSE-7.1
            ae31194e59d40267b36e38344b1ad139
    source rpm:
            6558c6ca5bee620485fd52a9a7ec316d


    SuSE-7.0
            e34ddef90edd1effb95771b5d7f6f935
    SuSE-7.0
            13eb42a163f919c9a4c097d8dc55a4a3
    SuSE-7.0
            9e73db46c744ee38118c9cd4b97bda7a
    source rpm:
            d321ee18493970c45b232362653dc447


    SuSE-6.4
            3d255a622cd006656a662b0e7a5efb87
    SuSE-6.4
            311ac75ac7622c6b453c5d6ed5ef9c28
    SuSE-6.4
            c5a86e6598a9fc801f56533e060dcc61
    source rpm:
            294626d55b89e1a5b940b4441172b578



______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

  - screen
    A security report about a locally exploitable bug in screen's braile code
    was published on Bugtraq. SuSE ships screen without this code enabled.
    On SuSE version 8.0 screen isn't even running with higher privileges
    anymore.

______________________________________________________________________________

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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