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______________________________________________________________________________



                        SuSE Security Announcement



        Package:                shlibs (glibc-2.0, glibc-2.1)

        Date:                   Wednesday, September 6th, 2000 12:30 MEST

        Affected SuSE versions: 6.0, 6.1, 6.2, 6.3, 6.4, 7.0

        Vulnerability Type:     local root compromise

        Severity (1-10):        9

        SuSE default package:   yes

        Other affected systems: all glibc based linux systems, other

                                                        Un*x systems



    Content of this advisory:

        1) security vulnerability resolved: shlibs (glibc)

           problem description, discussion, solution and upgrade information

        2) pending vulnerabilities, temporary workarounds

        3) standard appendix (further information)





______________________________________________________________________________



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



    The glibc implementations in all SuSE distributions starting with

    SuSE-6.0 have multiple security problems where at least one of them

    allows any local user to gain root access to the system.



    a) ld-linux.so.2, the runtime linker, is supposed to clean environment

    variables that may influence the execution of programs ran by a

    suid program. Variables of that kind include LD_LIBRARY_PATH and

    LD_PRELOAD. These variables do not have any effect on the suid

    application itself since the linker ignores them. However, if the

    suid program executes another non-suid application without dropping

    privileges and without cleaning the environment, the LD_* variables

    would allow an attacker to execute arbitrary code as the effective

    uid of the calling suid program. There is currently no program in the

    SuSE distribution known to be susceptible to this problem.



    b) locale handling portions of the glibc code fails to properly check

    given environment settings such as the variable LANGUAGE. This could

    lead to arbitrary code being executed as root, depending on the

    permissions and ownerships of the program being used for the exploit.



    c) A bug in the mutex handling code in the shlibs version for SuSE-7.0

    could cause multithreaded applications to hang or crash. This has also

    been fixed.



    There is only one way to temporarily circumvent the exploit: Disable

    all suid applications in the system.



    SuSE provides a updated packages for the vulnerable libraries. It is

    strongly recommended to upgrade to the latest version found on our

    ftp server as described below. The update packages remove all currently

    known security problems in the glibc package.



    Download the update packages as described below and install the

    package with the command `rpm -Fhv file.rpm'. The md5sum for each

    file is in the line below. You can verify the integrity of the rpm

    files using the command

        `rpm --checksig --nogpg file.rpm',

    independently from the md5 signatures below.



    SPECIAL INSTALL INSTRUCTIONS:

    Note that the complete update consists of three (3) binary rpm

    packages and one source rpm package per distribution and platform.

    libc-*.rpm contains the static libraries, libd is the package for

    the profiling+debugging version of the libraries.



    If at all possible, keep your machine calm while you perform the

    update. Execute the following commands after the rpm update has been

    applied:



            /sbin/ldconfig      # alternatively, use SuSEconfig

            /sbin/init u        # will restart init to make a clean shutdown

                                # possible once needed.



  i386 Intel Platform:



    SuSE-7.0

    http://ftp.suse.com/pub/suse/i386/update/7.0/a1/shlibs-2.1.3-154.i386.rpm

      753176172ebf628c6567c70a9b950933

    http://ftp.suse.com/pub/suse/i386/update/7.0/d1/libc-2.1.3-154.i386.rpm

      0f0696fc359cdb7b13f40a52d6676f09

    http://ftp.suse.com/pub/suse/i386/update/7.0/d2/libd-2.1.3-154.i386.rpm

      4ca3268f91a9294313cf871e9f7cb8b8

    source rpm:

    http://ftp.suse.com/pub/suse/i386/update/7.0/zq1/libc-2.1.3-154.src.rpm

      a6af3232fe6d474d6309c68469c126ec



    SuSE-6.4

    http://ftp.suse.com/pub/suse/i386/update/6.4/a1/shlibs-2.1.3-154.i386.rpm

      150dcb3854b066c021c396b4a0fe25e6

    http://ftp.suse.com/pub/suse/i386/update/6.4/d1/libc-2.1.3-154.i386.rpm

      75c9aef75d6e7e4b196c21bb500d00e0

    http://ftp.suse.com/pub/suse/i386/update/6.4/d2/libd-2.1.3-154.i386.rpm

      47fff508b0b67a82356361aa23c8beae

    source rpm:

    http://ftp.suse.com/pub/suse/i386/update/6.4/zq1/libc-2.1.3-154.src.rpm

      bfeaa4e15ecbe1fea986b710152b5fec



    SuSE-6.3

    http://ftp.suse.com/pub/suse/i386/update/6.3/a1/shlibs-2.1.2-47.i386.rpm

      8e88f237414a4d8f96131b17267b4d53

    http://ftp.suse.com/pub/suse/i386/update/6.3/d1/libc-2.1.2-47.i386.rpm

      575bb0c94474add7ae02333cbb77cba0

    http://ftp.suse.com/pub/suse/i386/update/6.3/d2/libd-2.1.2-47.i386.rpm

      8728db143b6393a261aa9060d9321345

    source rpm:

    http://ftp.suse.com/pub/suse/i386/update/6.3/zq1/libc-2.1.2-47.src.rpm

      eea1810dceafe5e7f77b4b5137829834



    SuSE-6.2

    http://ftp.suse.com/pub/suse/i386/update/6.2/a1/shlibs-2.1.1-29.i386.rpm

      78360eddc58f3897a14327d2fa214191

    http://ftp.suse.com/pub/suse/i386/update/6.2/d1/libc-2.1.1-29.i386.rpm

      456cad1d8034d40ebbf8337d1308c4de

    http://ftp.suse.com/pub/suse/i386/update/6.2/d2/libd-2.1.1-29.i386.rpm

      6dccdf557c6d329b40238a1644368564

    source rpm:

    http://ftp.suse.com/pub/suse/i386/update/6.2/zq1/libc-2.1.1-29.src.rpm

      cec489c212826cb2dcc65a602da61da3



    SuSE-6.1

    http://ftp.suse.com/pub/suse/i386/update/6.1/a1/shlibs-2000.9.5-0.i386.rpm

      7a272e7f15fd2dec69401d4c788de015

    http://ftp.suse.com/pub/suse/i386/update/6.1/d1/libc-2000.9.5-0.i386.rpm

      c748944bbe8a55f69478e6ef0bda843a

    http://ftp.suse.com/pub/suse/i386/update/6.1/d2/libd-2000.9.5-0.i386.rpm

      7fce2e2e41b62dc985e48ee31f6dac1c

    source rpm:

    http://ftp.suse.com/pub/suse/i386/update/6.1/zq1/libc-2000.9.5-0.src.rpm

      77fa60f5a3a10e02460bd1960b1f78f6



    Please use the packages from the SuSE-6.1 directory for SuSE-6.0!







  Sparc Platform:



    SuSE-7.0:

    http://ftp.suse.com/pub/suse/sparc/update/7.0/a1/shlibs-2.1.3-154.sparc.rpm

      1563171d7ee17a3048500afd4424927d

    http://ftp.suse.com/pub/suse/sparc/update/7.0/d1/libc-2.1.3-154.sparc.rpm

      a907fbb3e5e48664cadb6b75570e15b2

    http://ftp.suse.com/pub/suse/sparc/update/7.0/d2/libd-2.1.3-154.sparc.rpm

      f60071e3a497e3af48078338b3bd6610

    source rpm:

    http://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/libc-2.1.3-154.src.rpm

      690a34f9ddb6bd6edf41a07d5fba0ad4







  AXP Alpha Platform:



    SuSE-6.4

    http://ftp.suse.com/pub/suse/axp/update/6.4/a1/shlibs-2.1.3-154.alpha.rpm

      d08a782d1dc1cc406b2141727295befe

    http://ftp.suse.com/pub/suse/axp/update/6.4/d1/libc-2.1.3-154.alpha.rpm

      730c9b3c98f9d243c09ce41c5c4240a5

    http://ftp.suse.com/pub/suse/axp/update/6.4/d2/libd-2.1.3-154.alpha.rpm

      0c2ba3d11a42d84f48b1ee79a15e36b2

    source rpm:

    http://ftp.suse.com/pub/suse/axp/update/6.4/zq1/libc-2.1.3-154.src.rpm

      a5f2a207c6f8b179bbd91cea9c96711d



    SuSE-6.3

    http://ftp.suse.com/pub/suse/axp/update/6.3/a1/shlibs-2.1.2-47.alpha.rpm

      afc0ac7f3db066702fbd19bfaa216751

    http://ftp.suse.com/pub/suse/axp/update/6.3/d1/libc-2.1.2-47.alpha.rpm

      3530ef711231a5b378d14fe70e2971f6

    http://ftp.suse.com/pub/suse/axp/update/6.3/d2/libd-2.1.2-47.alpha.rpm

      5836a7a1557046b0c3498b7dec1ee436

    source rpm:

    http://ftp.suse.com/pub/suse/axp/update/6.3/zq1/libc-2.1.2-47.src.rpm

      0100769ad09d68563a7540ba73c826d7



    SuSE-6.1

    http://ftp.suse.com/pub/suse/axp/update/6.1/a1/shlibs-2000.9.5-0.alpha.rpm

      64c59dcb13069293694faf845446463e

    http://ftp.suse.com/pub/suse/axp/update/6.1/d1/libc-2000.9.5-0.alpha.rpm

      2b8df961dcfb42933cdf298f9229cffd

    http://ftp.suse.com/pub/suse/axp/update/6.1/d2/libd-2000.9.5-0.alpha.rpm

      75dd4bcfb0bf2cc64fe8dd5bfc4a69f0

    source rpm:

    http://ftp.suse.com/pub/suse/axp/update/6.1/zq1/libc-2000.9.5-0.src.rpm

      11871baa8279f8c0c79f6c9d95ca531c





  PPC Power PC Platform:



    SuSE-6.4

    http://ftp.suse.com/pub/suse/ppc/update/6.4/a1/shlibs-2.1.3-154.ppc.rpm

      8565cd463e4fbbccc39aa96f1eefdc70

    http://ftp.suse.com/pub/suse/ppc/update/6.4/d1/libc-2.1.3-154.ppc.rpm

      987ed3d338fb7c42083cf6dd2057ce0b

    http://ftp.suse.com/pub/suse/ppc/update/6.4/d2/libd-2.1.3-154.ppc.rpm

      a212f188cf31d55c2016236d2c313cf4

    source rpm:

    http://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/libc-2.1.3-154.src.rpm

      401b4f2f306a065fb04edd89cd153364



______________________________________________________________________________



2)  Pending vulnerabilities in SuSE Distributions and Workarounds:



    This section addresses currently known vulnerabilities in Linux/Unix

    systems that have not been resolved yet as of the release date of

    this advisory.



     - screen



        local root compromise. Update+advisory follows this advisory.



     - zope



        SuSE distributions before 7.0 do not contain zope as a package.

        An updated package for the freshly released SuSE-7.0 is on the way.



     - xchat



        A fix for the URL handler vulnerabilty is in progress and will

        be released within a few days. There is currently no effective

        and easy workaround other than removing the package by hand

        (`rpm -e xchat'). More information on xchat can be found in

        xchat's documentation directory /usr/doc/packages/xchat or

        /usr/share/doc/packages/xchat for SuSE-7.0.



______________________________________________________________________________



3)  standard appendix:



    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 .

    ===============================================



Regards,

Roman Drahtmüller.

- - --

 -                                                                      -

| Roman Drahtmüller       //          "Caution: Cape does |

  SuSE GmbH - Security           Phone: //       not enable user to fly."

| Nürnberg, Germany     +49-911-740530 // (Batman Costume warning label) |

 -                                                                      -

______________________________________________________________________________



    The information in this advisory may be distributed or reproduced,

    provided that the advisory is not modified in any way.

    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  2048/3D25D3D9 1999/03/06 SuSE Security Team 



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