SUSE Security Announcement: thttpd (SuSE-SA:2003:044)

31 Oct 2003


      -----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SUSE Security Announcement

        Package:                thttpd
        Announcement-ID:        SuSE-SA:2003:044
        Date:                   Friday, Oct 31st 2003 13:04 MEST
        Affected products:      7.3, 8.0, 8.1, 8.2, 9.0
        Vulnerability Type:     remote privilege escalation/
                                information leak
        Severity (1-10):        5
        SUSE default package:   no
        Cross References:       CAN-2003-0899
                                CAN-2002-1562

    Content of this advisory:
        1) security vulnerability resolved:
            - buffer overflow
            - information leak (virtual hosting)
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - libnids
            - KDE
            - postgresql
            - frox
            - sane
            - ircd
            - fileutils
            - mc
            - apache1/2
        3) standard appendix (further information)

______________________________________________________________________________

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

    Two vulnerabilities were found in the "tiny" web-server thttpd.
    The first bug is a buffer overflow that can be exploited remotely
    to overwrite the EBP register of the stack. Due to memory-alignment of
    the stack done by gcc 3.x this bug can not be exploited. All thttpd
    versions mentioned in this advisory are compiled with gcc 3.x and are
    therefore not exploitable.
    The other bug occurs in the virtual-hosting code of thttpd. A remote
    attacker can bypass the virtual-hosting mechanism to read arbitrary
    files.

    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/thttpd-2.23beta1-165.i586.rpm
      e33f3897cac1e1fe117eff8ca252ec0f
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/thttpd-2.23beta1-165.i586.patch.rpm
      cd5c2aeb6d31d6a6781f392af17a4989
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/thttpd-2.23beta1-165.src.rpm
      c6e2446bc94c8c00d35b7741b67df678

    SuSE-8.2:
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/thttpd-2.23beta1-164.i586.rpm
      a491b55f562fa0f3b1679ee819140c72
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/thttpd-2.23beta1-164.i586.patch.rpm
      bbb3dd624b19d8683223049a070d4cf2
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/thttpd-2.23beta1-164.src.rpm
      2710751ff1ee8fbab3c2934c5cb09f3d

    SuSE-8.1:
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/thttpd-2.23beta1-163.i586.rpm
      428db4fb2eccebb5ed16cb28161ba2a5
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/thttpd-2.23beta1-163.i586.patch.rpm
      b32fb0a87d8d7de3ed1953e64da89bc8
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/thttpd-2.23beta1-163.src.rpm
      e64bc1488747a414f6bd60735f82385f

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/thttpd-2.20c-98.i386.rpm
      952dcca179b647afdeea02b987e3daf8
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/n4/thttpd-2.20c-98.i386.patch.rpm
      e596221f34a73ba6fdd29abcecb6e211
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/thttpd-2.20c-98.src.rpm
      8500be9c635d1c5c9618ecca2a09a5e7

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/thttpd-2.20b-175.i386.rpm
      16ffc5238c1f57b8a1e6e02989524e82
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/thttpd-2.20b-175.src.rpm
      b5c4b9c65182fcd2a326e3edad7b2dfb


    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/thttpd-2.20b-112.ppc.rpm
      e7aaff82bd90c459849dd78b1cc47515
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/thttpd-2.20b-112.src.rpm
      8ac31eb38063a891e37ed327a5ddbc0c

______________________________________________________________________________

2)  Pending vulnerabilities in SUSE Distributions and Workarounds:

  - libnids
    New libnids packages were released to stop remote command execution
    due to a memory corruption in the TCP reassembly code. (CAN-2003-0850)
    Please download them from our FTP servers.

  - 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.

  - postgresql
    Several buffer overflow problems were fixed in the pg_to_asci()
    function of postgresql server.
    New packages are available on our FTP servers.

  - frox
    A denial-of-service attack in frox can be trigger remotely.
    The packages are currently tested and will be release as soon as
    possible.

  - 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.

  - fileutils
    A local denial-of-service attack can be triggered by abusing the -w
    option of ls(1). This attack can be turned into a remote denial-of-
    service by using network services, like wuftpd, that rely on the
    ls(1) command installed on the system.
    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 <name-of-the-file.rpm>
       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 <file.rpm>
       to verify the signature of the package, where <file.rpm> 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-subscribe@suse.com>.

    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
                <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 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 <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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Bye,
     Thomas
-- 
  Thomas Biege <thomas@suse.de>, 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

Thomas Biege

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