Articles / SuSE: remote privilege esca...

SuSE: remote privilege escalation in cups

The well known Common Unix Printing System (CUPS) was found vulnerable to a buffer overflow in the Internet Printing Protocol (IPP) handling code. The buffer overflow could be exploited by a remote attacker as long as their IP address is allowed to connect to the CUPS server. Fixed packages are available from ftp.suse.com.
-----BEGIN PGP SIGNED MESSAGE-----

______________________________________________________________________________

                        SuSE Security Announcement

        Package:                cups
        Announcement-ID:        SuSE-SA:2002:005
        Date:                   Saturday, Feb 23st 2002 09:10 MET
        Affected SuSE versions: 7.1, 7.2, 7.3
        Vulnerability Type:     remote privilege escalation
        Severity (1-10):        5
        SuSE default package:   no
        Other affected systems: all systems running CUPS

    Content of this advisory:
        1) security vulnerability resolved: CUPS bufferoverflow in IPP
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, solutions, workarounds
        3) standard appendix (further information)

______________________________________________________________________________

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

    The well known Common Unix Printing System (CUPS) was found vulnerable
    to a buffer overflow in the Internet Printing Protocol (IPP) handling
    code.
    The buffer overflow could be exploited by a remote attacker as long as
    their IP address is allowed to connect to the CUPS server.

    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.

    After updateing the packages run "rclpd restart" as root to start the
    new daemon.



    i386 Intel Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/cups-1.1.10-81.i386.rpm
      bfb52a55305ac12880b5e59410205a6e
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/cups-1.1.10-81.src.rpm
      e3d276cb505eaa1bf35946b5c1029562

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/cups-client-1.1.10-81.i386.rpm
      527eeb095abeb0ee0cad95f028a8222b

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/n1/cups-libs-1.1.10-81.i386.rpm
      9a125db90716f71b4fa31cf2ba4180a8

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/i386/update/7.3/d3/cups-devel-1.1.10-81.i386.rpm
      d8457f2c62e7a85e927b615570efa82b

    SuSE-7.2
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/n1/cups-1.1.6-103.i386.rpm
      9a6c6b3fcd1dea6504121b76de1615b5
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/cups-1.1.6-103.src.rpm
      92c0fc63d6b9c6c299583868f69ac649

    SuSE-7.2
    ftp://ftp.suse.com/pub/suse/i386/update/7.2/d3/cups-devel-1.1.6-103.i386.rpm
      a0ed0a207040b6aa6b8080d7e146ce04

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/cups-1.1.6-102.i386.rpm
      488317348075ae50f0d5f5bd9e82b247
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/cups-1.1.6-102.src.rpm
      54f3b1bcb3cc727dfcf05514d84c402d

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/i386/update/7.1/d3/cups-devel-1.1.6-102.i386.rpm
      6019620534415dd4d09681583ee627a1



    Sparc Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/cups-1.1.10-34.sparc.rpm
      7777fb032e1c2b45956db2d3ccf9b3c3
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/cups-1.1.10-34.src.rpm
      91684561da7f476055c71239b61c549b

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/cups-client-1.1.10-34.sparc.rpm
      8badff242e1903d7f812bafb0e6a1831

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/n1/cups-libs-1.1.10-34.sparc.rpm
      355221f9ca9c435a24251915b3384ea2

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d3/cups-devel-1.1.10-34.sparc.rpm
      60daf45ca8a75237421c8abd27c9f433

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/cups-1.1.6-37.sparc.rpm
      063b7953d50ad4b4958541bfaccd270c
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/cups-1.1.6-37.src.rpm
      d5d5e4bf719ab2eca49cadc9708e0ff3

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/sparc/update/7.1/d3/cups-devel-1.1.6-37.sparc.rpm
      2cbd702f7d978a098ce9c84e3b1cc7ff



    AXP Alpha Platform:

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/cups-1.1.6-33.alpha.rpm
      7188e40aac0c097095c2df088a93265d
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/cups-1.1.6-33.src.rpm
      ac122fe5b1305bab6a8c5904699d4bd5

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/axp/update/7.1/d3/cups-devel-1.1.6-33.alpha.rpm
      ae6685e65e7db1b9afe276d51d6da51a



    PPC PowerPC Platform:

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/cups-1.1.10-60.ppc.rpm
      99aa8fcf0f21d5799931953c90435d72
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/zq1/cups-1.1.10-60.src.rpm
      6e0b6c9e04eb7167b3585aebbc0deb29

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/cups-client-1.1.10-60.ppc.rpm
      61f807924b16930166d711c1da8a4cc0

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/n1/cups-libs-1.1.10-60.ppc.rpm
      090132d0ae790027382c88a9b331fa9e

    SuSE-7.3
    ftp://ftp.suse.com/pub/suse/ppc/update/7.3/d3/cups-devel-1.1.10-60.ppc.rpm
      f211da7b5dc400c8e087a6ef8178afd5

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/cups-1.1.6-47.ppc.rpm
      52c247f3cbf4836dacec7a767a4fe3c7
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/cups-1.1.6-47.src.rpm
      1937730cf78b1c658b430e9525084a93

    SuSE-7.1
    ftp://ftp.suse.com/pub/suse/ppc/update/7.1/d3/cups-devel-1.1.6-47.ppc.rpm
      c906d4106d30f1e84133e8d45a857b2d


______________________________________________________________________________

2)  Pending vulnerabilities in SuSE Distributions and Workarounds:

    - squid
      A heap overflow in squid's URL constructing functions is fixed and
      new packages are currently being built.

    - ucd-snmpd
      The UCD snmpd contains various security releated bugs.
      We are currently reviewing the code and available fixes to ensure
      they all get fixed. Patches will be available as soon as possible.
      It is strongly recommended to filter SNMP (TCP and UDP packets
      with destination of port 161) traffic.

    - hanterm/wmtv
      The recently reported vulnerabilities in hanterm and wmtv do not
      affect SuSE installations because they are not installed setuid
      or setgid.

    - cipe
      We are about to prepare kernel update packages that fix a DoS
      problem in the kernel modules for the cipe encrypted tunneling
      software.

______________________________________________________________________________

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 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@suse.de" upon installation or upgrade, provided that
           the package gpg is installed. The file containing the public key
           is placed at the toplevel 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 annoucements 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 cleartext signature shows proof of the
    authenticity of the text.
    SuSE GmbH 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 GmbH,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
-- 
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