Articles / SuSE: New hylafax packages …

SuSE: New hylafax packages fix remote code execution

Hylafax is an Open Source fax server which allows sharing of fax equipment among computers by offering its service to clients by a protocol similar to FTP. The SuSE Security Team found a format bug condition during a code review of the hfaxd server. It allows remote attackers to execute arbitrary code as root. However, the bug can not be triggered in hylafax' default configuration. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                hylafax
        Announcement-ID:        SuSE-SA:2003:045
        Date:                   Mon Nov 10 15:00:00 CET 2003
        Affected products:      7.3, 8.0, 8.1, 8.2, 9.0
                                SuSE Linux Enterprise Server 7
                                SuSE Linux Standard Server 8
                                SuSE Linux Desktop 1.0
                                SuSE Linux Office Server
        Vulnerability Type:     remote code execution
        Severity (1-10):        5
        SUSE default package:   No
        Cross References:       CAN-2003-0886
                                http://www.hylafax.org

    Content of this advisory:
        1) security vulnerability resolved: Format bug condition in hfaxd.
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - ethereal
            - KDE
            - sane
            - ircd
            - mc
            - apache1/2
        3) standard appendix (further information)

______________________________________________________________________________

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

    Hylafax is an Open Source fax server which allows sharing of fax
    equipment among computers by offering its service to clients by
    a protocol similar to FTP.
    The SuSE Security Team found a format bug condition during a code
    review of the hfaxd server. It allows remote attackers to execute
    arbitrary code as root. However, the bug can not be triggered in
    hylafax' default configuration.

    The "capi4hylafax" packages also need to be updated as a dependency
    where they are available.

    After the update has been successfully applied the hfaxd server has
    to be restarted by issuing the following command as root:

       /etc/rc.d/hylafax restart

    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-9.0:
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/hylafax-4.1.7-67.i586.rpm
      598081f0d8518014c122466549d3aee2
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/capi4hylafax-4.1.7-67.i586.rpm
      b440a0ac3debb15af86c55ce9648a0c9
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/hylafax-4.1.7-67.i586.patch.rpm
      b133d6a01100c51769edfe73842f21e5
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/capi4hylafax-4.1.7-67.i586.patch.rpm
      48b02652d3efd052a99fe45346a40533
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/hylafax-4.1.7-67.src.rpm
      44b246480b629ee9659ff2360999f4be

    SuSE-8.2:
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/hylafax-4.1.5-190.i586.rpm
      a17a36e3d9779aaddc074e634c1d16c2
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/capi4hylafax-4.1.5-190.i586.rpm
      f016a370c9428aaca1a4393e3fb1fa6c
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/hylafax-4.1.5-190.i586.patch.rpm
      f9be5873c7f8abaae23494f98463b451
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/capi4hylafax-4.1.5-190.i586.patch.rpm
      715001c063280b3ff8c3ec9c918776b9
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/hylafax-4.1.5-190.src.rpm
      cdf6cf2e9ad8e9f96a0a76ba03921c5a

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/hylafax-4.1.3-145.i586.rpm
      85ffa634af490894d049c2c350bd5637
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/capi4hylafax-4.1.3-145.i586.rpm
      c3766b389e79820e88375127ce47246f
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/hylafax-4.1.3-145.i586.patch.rpm
      f6afb37c81542e75da229db6cd1f9571
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/capi4hylafax-4.1.3-145.i586.patch.rpm
      e3f1e42ab4a12d056ad440e4607214c9
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/hylafax-4.1.3-145.src.rpm
      6babcf169ecf60cbfc83a3f8575cdf3e

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/hylafax-4.1-303.i386.rpm
      e4492b144902043a38bfd71dbb683b23
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/hylafax-4.1-303.i386.patch.rpm
      02f80c2b8b28d176bbba8a6dccda4dce
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/hylafax-4.1-303.src.rpm
      c79d4be78cca347d5ecded4c6029f2b2

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n3/hylafax-4.1-303.i386.rpm
      b42d4ff0c43cec7e09fe4c1bbf5c8226
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/hylafax-4.1-303.src.rpm
      8bdce70f21a0362882947a1d4de760ae


    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n3/hylafax-4.1-122.sparc.rpm
      fa187f99f0a25df1815445dbbb6a0abe
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/hylafax-4.1-122.src.rpm
      227353e1b80121f3ccfabc7fb888a485



    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n3/hylafax-4.1-206.ppc.rpm
      4388fa7fe1aa5173e3d33bdf1c477349
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/hylafax-4.1-206.src.rpm
      a95fd798a47396a077d7690a3e62986b


______________________________________________________________________________

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.

    - sane
    The scanner service sane of SuSE Linux 7.3-8.1 is vulnerable to
    a remote denial-of-service attack. This attack can even be triggered
    if the attackers host is not listed in the saned.conf file.
    The packages are currently tested and will be release as soon as
    possible.

    - 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.
    The packages are currently tested and will be release as soon as
    possible.

    - 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)


______________________________________________________________________________

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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-- 
~
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@suse.de - SuSE Security Team
~
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