Articles / SuSE: New sane packages fix…

SuSE: New sane packages fix remote denial-of-service

The sane (Scanner Access Now Easy) package provides access to scanners either locally or remotely over the network. Several bugs in sane were fixed to avoid remote denial-of-service attacks. These attacks can even be executed if the remote attacker is not allowed to access the sane server by not listing the attackers IP in the file sane.conf. Per default saned only accepts local requests. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                sane
        Announcement-ID:        SuSE-SA:2003:046
        Date:                   Tuesday, Nov 18th 2003 14:30 MEST
        Affected products:      7.3, 8.0, 8.1
                                SuSE Linux Desktop 1.0
        Vulnerability Type:     remote denial-of-service
        Severity (1-10):        5
        SUSE default package:   yes
        Cross References:       CAN-2003-0773
                                CAN-2003-0774
                                CAN-2003-0775
                                CAN-2003-0776
                                CAN-2003-0777
                                CAN-2003-0778

    Content of this advisory:
        1) security vulnerability resolved: several security vulnerabilities
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
           - ethereal
           - KDE
           - KDE wrong file permissions
           - ircd
           - mc
           - apache1/2
           - proftpd
           - gdm2
           - epic/epic4
        3) standard appendix (further information)

______________________________________________________________________________

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

    The sane (Scanner Access Now Easy) package provides access to scanners
    either locally or remotely over the network.

    Several bugs in sane were fixed to avoid remote denial-of-service
    attacks. These attacks can even be executed if the remote attacker
    is not allowed to access the sane server by not listing the attackers
    IP in the file sane.conf.
    Per default saned only accepts local requests.

    As a temporary workaround saned can be started via xinetd or inetd in
    conjunction with tcpwrapper to restrict remote access.

    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.


    Intel i386 Platform:

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sane-1.0.8-143.i586.rpm
      5b728bc3ac724be64aa736dbebe2aa23
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/sane-1.0.8-143.i586.patch.rpm
      77ab2574c35513136076c4b2a77e9cbf
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/sane-1.0.8-143.src.rpm
      6ddec5bdadb07f985a08e592cd4c68b3

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra2/sane-1.0.7-217.i386.rpm
      9438d81c7bd8b41dee948696f138c771
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra2/sane-1.0.7-217.i386.patch.rpm
      f461a294ab7d3638bf4b3e83f3910143
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/sane-1.0.7-217.src.rpm
      ea888fa0c4e6aaf41e23caaf4f68a1d2

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/gra1/sane-1.0.5-295.i386.rpm
      53d25817ed9c53cf6078d3794862a13e
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/sane-1.0.5-295.src.rpm
      593a886a54482c841baa0fe9d43690c6


    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/gra1/sane-1.0.5-114.sparc.rpm
      bdb7ce58c8d363a03dadc719c2421d84
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/sane-1.0.5-114.src.rpm
      4d0f4994f1fc730edfcefa2d33fe456d


    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/gra1/sane-1.0.5-179.ppc.rpm
      83643306b81f0e89d4a5c96001a65ea5
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/sane-1.0.5-179.src.rpm
      fa277cfb3ec68aedb24de2ff2d13673f


______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

    - ethereal
    A new official version of ethereal, a network traffic analyzer, was
    released to fix various security-related problems.
    An update package is currently being tested and will be released
    as soon as possible.

    - KDE
    New KDE packages are currently being tested. These packages fixes
    several vulnerabilities:
      + remote root compromise (CAN-2003-0690)
      + weak cookies (CAN-2003-0692)
      + SSL man-in-the-middle attack
      + information leak through HTML-referrer (CAN-2003-0459)
    The packages will be release as soon as testing is finished.

    - KDE wrong file permissions
    Due to a missing synchronisation during SuSE Linux 8.2 beta-testing
    phase some configuration files of KDE on SuSE Linux 8.2 are world-
    writeable. Please check the files in /etc/opt/kde3/share/config
    and add an appropritae line to /etc/permissions.local, like:
/etc/opt/kde3/share/config/kmailrc     root.root 0644
        /etc/opt/kde3/share/config/kioslaverc  root.root 0644
        /etc/opt/kde3/share/config/kdeglobals  root.root 0644
    Set the new permission with 'chkstat -set /etc/permissions.local'
    as root.

    - ircd
    The Internet Relay Chat daemon is vulnerable to a remote denial-of-
    service attack. The attack can be triggered by irc clients directly
    connected to the daemon.
    Update packages are available on our FTP servers.

    - mc
    By using a special combination of links in archive-files it is possible
    to execute arbitrary commands while mc tries to open it in its VFS.
    The packages are currently tested and will be release as soon as
    possible.

    - apache1/2
    The widely used HTTP server apache has several security vulnerabilities:
      - locally exploitable buffer overflow in the regular expression code.
        The attacker must be able to modify .htaccess or httpd.conf.
        (affects: mod_alias and mod_rewrite)
      - under some circumstances mod_cgid will output its data to the
        wrong client (affects: apache2)

    - proftpd
    A remote denial-of-service attack in the FTP server proftpd was fixed.
    The denial-of-service can be triggered by a one-byte buffer overflow
    with a fixed character. Therefore the bug can not be abused by an
    attacker to execute arbitrary code. If the binary is compiled with
    version 3.x of gcc this bug may not even lead to denial-of-service
    condition due to stack alignment.
    Update packages are available on our FTP servers.

    - gdm2
    Two remote denial-of-service attacks were fixed in GDM.
    Update packages are available on our FTP servers.

    - epic/epic4
    The well known IRC client epic can probably be exploited remotely by
    a malicious server.
    Update packages are available on our FTP servers.

______________________________________________________________________________

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 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 .
    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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Bye,
     Thomas
-- 
  Thomas Biege , SUSE LINUX AG, 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
-- 
... stay with me, save and ignorant, go back to sleep...
- Maynard James Keenan
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