[SuSE] Mehrere Schwachstellen in der libtiff - SUSE-SA:2004:038

win-sec-ssc at dfn-cert.de win-sec-ssc at dfn-cert.de
Fri Oct 22 17:27:34 CEST 2004


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

Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgendes SuSE Security Announcement. Wir geben
diese Informationen unveraendert an Sie weiter.

Die libtiff wird von verschiedenen Programmen zur Anzeige von Bildern im
Tag Image File Format (TIFF) verwendet. Die Daten von TIFF-Bildern sind
optional lauflaengenkodiert (Run Length Encoding - RLE), um Platz zu
sparen.

CAN-2004-0803 - Fehler in der Lauflaengenkodierung (RLE) der libtiff

   Durch einen Fehler in den Routinen zur Bearbeitung der
   Lauflaengenkodierung in der libtiff kann ein Angreifer u.U. beliebigen
   Code mit den Rechten des Benutzers ausfuehren. Der Angreifer muss dazu
   ein entsprechend manipuliertes Bild, z.B. per Mail oder auf einer
   Webseite, anbieten.

CAN-2004-0804 - Division by Zero in der libtiff

   Durch einen Fehler in tif_dirread.c teilt die libtiff beim Dekodieren
   eines Bildes u.U. durch null und bringt so die Anwendung zum Absturz.
   Der Angreifer muss dazu ein entsprechend manipuliertes Bild, z.B. per
   Mail oder auf einer Webseite, anbieten.

CAN-2004-0886 - Integer Overflows in der libtiff

   Es existieren mehrere Fehler in der libtiff beim Einlesen von Bildern,
   welche zu einem Integer Overflow fuehren koennen und durch die u.U.
   Fehler bei der Allozierung von Speicher gemacht werden. Ein Angreifer
   kann die Schwachstellen ausnutzen, indem er ein entsprechend
   manipuliertes Bild, z.B. per Mail verschickt oder auf einer Webseite,
   anbietet. Unter Umstaenden ist es so moeglich, beliebigen Code mit den
   Rechten des Benutzers auszufuehren.

CAN-2004-0929 - Buffer Overflow im "old JPEG" Code der libtiff

   Die Bibliothek libtiff enthaelt einen Fehler in den OJPEG (old jpeg)
   Funktionen. Ein Angreifer kann dadurch einen Buffer Overflow ausloesen
   und u.U. Code mit den Rechten des Benutzers ausfuehren.

Betroffen ist das Paket libtiff auf den Plattformen Suse Linux 8.1, 8.2, 
9.0 und 9.1, sowie dem SUSE Linux Enterprise Server 8 und 9 als auch dem 
SUSE Linux Desktop 1.0. Vom Hersteller werden ueberarbeitete Pakete zur 
Verfuegung gestellt.

(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
    Andreas Bunten, DFN-CERT

- -- 
Andreas Bunten (CSIRT), DFN-CERT Services GmbH
https://www.dfn-cert.de/, +49 40 808077-617


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

______________________________________________________________________________

                         SUSE Security Announcement

         Package:                libtiff
         Announcement-ID:        SUSE-SA:2004:038
         Date:                   Friday, Oct 22nd 2004 18:00 MEST
         Affected products:      8.1, 8.2, 9.0, 9.1
                                 SUSE Linux Enterprise Server 8, 9
                                 SUSE Linux Desktop 1.0
         Vulnerability Type:     code execution
         Severity (1-10):        9
         SUSE default package:   yes
         Cross References:       CAN-2004-0803
                                 CAN-2004-0804
                                 CAN-2004-0886
                                 CAN-2004-0929

     Content of this advisory:
         1) security vulnerability resolved:
              - several buffer overflows and related problems in
                libtiff were fixed.
            problem description
         2) solution/workaround
         3) special instructions and notes
         4) package location and checksums
         5) pending vulnerabilities, solutions, workarounds:
             - security problems in PDF viewers
 	    - freeradius denial of service problems
 	    - mpg123 buffer overflow
         6) standard appendix (further information)

______________________________________________________________________________

1) problem description, brief discussion

    libtiff is used by image viewers and web browser to view "TIFF" images.
    These usually open and display those images without querying the user,
    making a normal system by default vulnerable to exploits of image
    library bugs.

    Chris Evans found several security related problems during an audit of
    the image handling library libtiff, some related to buffer overflows,
    some related to integer overflows and similar. This issue is being
    tracked by the CVE ID CAN-2004-0803.

    Matthias Claasen found a division by zero in libtiff. This is tracked
    by the CVE ID CAN-2004-0804.

    Further auditing by Dmitry Levin exposed several additional integer
    overflows. These are tracked by the CVE ID CAN-2004-0886.

    Additionally, iDEFENSE Security located a buffer overflow in the OJPEG
    (old JPEG) handling in the SUSE libtiff package. This was fixed by
    disabling the old JPEG support and is tracked by the CVE ID CAN-2004-0929.

    SUSE wishes to thank all the reporters, auditors, and programmers
    for helping to fix these problems.

2) solution/workaround

    There is no workaround. Update the libtiff packages.

3) special instructions and notes

    Make sure that you restart your web browser after updating.

4) package location and checksums

     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.

     You can also use the YaST Online Update tool to install the security
     updates.

     Our maintenance customers are being notified individually. The packages
     are being offered for installation from the maintenance web.

     x86 Platform:

     SUSE Linux 9.1:
     ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/libtiff-3.6.1-38.12.i586.rpm
       cd373c181599ebbf3be0f021b811c7da
     patch rpm(s):
     ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/i586/libtiff-3.6.1-38.12.i586.patch.rpm
       a45416ea1ac9628b9e4e7e6f09653cb5
     source rpm(s):
     ftp://ftp.suse.com/pub/suse/i386/update/9.1/rpm/src/tiff-3.6.1-38.12.src.rpm
       2387abe21eebb97f319b6ddf1a982314

     SUSE Linux 9.0:
     ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/libtiff-3.5.7-376.i586.rpm
       db8b4d23eb887b3c391f5262f766ff86
     patch rpm(s):
     ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/i586/libtiff-3.5.7-376.i586.patch.rpm
       58112fc9e5c6395bc316f3b46ffeb0ca
     source rpm(s):
     ftp://ftp.suse.com/pub/suse/i386/update/9.0/rpm/src/tiff-3.5.7-376.src.rpm
       0810ea6ffe77b7a450698386a6238e61

     SUSE Linux 8.2:
     ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/libtiff-3.5.7-376.i586.rpm
       339e0ce21cceadb883d2022ec01c1219
     patch rpm(s):
     ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/i586/libtiff-3.5.7-376.i586.patch.rpm
       608c1b39e6d67c9da02e02d2176b7a97
     source rpm(s):
     ftp://ftp.suse.com/pub/suse/i386/update/8.2/rpm/src/tiff-3.5.7-376.src.rpm
       8891d3c8ff0dd0f283f63d4b3021b894

     SUSE Linux 8.1:
     ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/libtiff-3.5.7-376.i586.rpm

______________________________________________________________________________

5)  Pending vulnerabilities in SUSE Distributions and Workarounds:

     - security problems in pdf viewers
         Chris Evans, Dmitry Levin and others found several buffer and
         integer overflow problems in xpdf and xpdf clones.
         These are being tracked under the CVE Ids CAN-2004-0888 and
         CAN-2004-0889.
         New packages will be available soon.

     - freeradius
         Several bugs that can be abused to remotely crash freeradius have
         been discovered (CAN-2004-0938, CAN-2004-0960, CAN-2004-0961).
         New packages will be available soon.

     - mpg123
         A buffer overflow in mpg123 has been discovered. New packages will
         be available soon.

______________________________________________________________________________

6)  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 at suse.de),
        the checksums show proof of the authenticity of the package.
        We recommend against subscribing to security lists that cause the
        e-mail 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
        file name 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 at 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 at 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 at suse.com>.

     suse-security-announce at 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 at suse.com>.

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

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

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