Articles / SuSE: Possible remote compr…

SuSE: Possible remote compromise in libpng

The library libpng provides several functions to encode, decode and manipulate Portable Network Graphics (PNG) image files. Due to wrong calculation of some loop offset values a buffer overflow can occur. The buffer overflow can lead to Denial-of-Service or even to remote compromise. Fixed packages can be obtained from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                libpng
        Announcement-ID:        SuSE-SA:2003:0004
        Date:                   Tuesday, Jan 14th 2003 11:00 MEST
        Affected products:      7.1, 7.2, 7.3, 8.0, 8.1
                                SuSE Linux Database Server
                                SuSE eMail Server 3.1
                                SuSE eMail Server III
                                SuSE Firewall Adminhost VPN
                                SuSE Linux Admin-CD for Firewall
                                SuSE Firewall on CD 2 - VPN
                                SuSE Firewall on CD 2
                                SuSE Linux Enterprise Server for S/390
                                SuSE Linux Connectivity Server
                                SuSE Linux Enterprise Server 7
                                SuSE Linux Enterprise Server 8
                                SuSE Linux Office Server
                                UnitedLinux 1.0
        Vulnerability Type:     possible remote compromise
        Severity (1-10):        4
        SuSE default package:   yes
        Cross References:       CAN-2002-1363

    Content of this advisory:
        1) security vulnerability resolved: wrong offset calculation
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds:
            - fam
            - xpdf
            - libmcrypt
        3) standard appendix (further information)

______________________________________________________________________________

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

    The library libpng provides several functions to encode, decode and
    manipulate Portable Network Graphics (PNG) image files.
    Due to wrong calculation of some loop offset values a buffer overflow
    can occur. The buffer overflow can lead to Denial-of-Service or even
    to remote compromise.

    After updating libpng all applications that use libpng should be
    restarted. Due to the fact that a lot of applications are linked
    with libpng it may be necessary to switch to runlevel S and back
    to the previous runlevel or even to reboot the system.

    There is no temporary fix known. Please install the new packages from
    our FTP servers.

    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/libpng-1.2.4-58.i586.rpm
      7d21806e31c16a9c4bf351b303ce81aa
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/i586/libpng-1.2.4-58.i586.patch.rpm
      3efc4170990f081117c8106efd7bed33
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.1/rpm/src/libpng-1.2.4-58.src.rpm
      a24985f7c0bb5a54c87115a7944a87cf

    SuSE-8.0:
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra1/libpng-2.1.0.12-160.i386.rpm
      13d9eef080381224c1e4e0d168401a27
    patch rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/gra1/libpng-2.1.0.12-160.i386.patch.rpm
      fc75c7843967f914810520bc0d63503b
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/8.0/zq1/libpng-2.1.0.12-160.src.rpm
      0269d8c6fa56109120d5933fd914b82b

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/gra1/libpng-2.1.0.12-160.i386.rpm
      707082f5742ee15ed94de2df066963a2
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/libpng-2.1.0.12-160.src.rpm
      1206600c361fefc09efb83887203d00a

    SuSE-7.2:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/gra1/libpng-2.1.0.10-57.i386.rpm
      9a6ee6c1a3344be521398aca8b613f03
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/libpng-2.1.0.10-57.src.rpm
      c5fe80f3683a1c62e9ae84c4e1541e5a

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/gra1/libpng-2.1.0.8-17.i386.rpm
      d2e6e198fdbe2e3bb0a3ba2b8dc3e524
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/libpng-2.1.0.8-17.src.rpm
      024121c035b54982ea5b8394804cc796




    Sparc Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/gra1/libpng-2.1.0.12-99.sparc.rpm
      305317e07da2749b6d198d4899c4313c
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/libpng-2.1.0.12-99.src.rpm
      2d4302f4b6a4fb29d392aef053539fc4





    AXP Alpha Platform:

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/gra1/libpng-2.1.0.8-24.alpha.rpm
      970e51672298667bb1b5d0a66ff2fd89
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/libpng-2.1.0.8-24.src.rpm
      bdef09c298521393a95f3bc0d6737e03

    SuSE-7.0:
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/gra1/libpng-2.1.0-246.alpha.rpm
      9706c75ee0fd42cce789be5a9c8a62e3
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/libpng-2.1.0-246.src.rpm
      a5b96e5c5757bad8c4435079c3083564



    PPC Power PC Platform:

    SuSE-7.3:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/gra1/libpng-2.1.0.12-131.ppc.rpm
      bcab26f1476ba950d6437b85d5c58c88
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/libpng-2.1.0.12-131.src.rpm
      0ba6353d4333e07dd8bbdfa7cc762c28

    SuSE-7.1:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/gra1/libpng-2.1.0.8-22.ppc.rpm
      5f809fddcb5b1db352a06155b4e71aaa
    source rpm(s):
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/libpng-2.1.0.8-22.src.rpm
      58cea385332541d566b397e627755cdc


______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - fam
      SuSE Versions < 8.0 are shipping a vulnerable version of fam
      which allows unprivileged users to determine filenames of
      group root.
      New fam packages are build and will be released right after
      quality assurance permits.
    - xpdf
      An integer overflow in pdftops may lead to system compromise.
      New packages are currently being build.
    - libmcrypt
      Several buffer overflows in libmcrypt were discovered by Ilia
      Alshanetsky. The buffer overflows can lead to system compromise.
      New packages are currently being build.


______________________________________________________________________________

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,Deutschherrnstr. 15-19,90429 Nuernberg
  Function: 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
-- 

  Over thinking, Over analyzing, seperates the body from the mind.
                                               - Maynard James Keenan
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