SuSE Security Announcement: glibc/shlibs, in.ftpd (SuSE-SA:2001:046)

From: Roman Drahtmueller (drahtat_private)
Date: Mon Dec 24 2001 - 10:18:39 PST

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    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                glibc/shlibs, in.ftpd
            Announcement-ID:        SuSE-SA:2001:046
            Date:                   Monday, Dec 24th 2001 19:00 MET
            Affected SuSE versions: (6.3), 6.4, 7.0, 7.1, 7.2, 7.3
            Vulnerability Type:     remote privilege escalation
            Severity (1-10):        8
            SuSE default package:   yes
            Other affected systems: Most Linux systems
    
        Content of this advisory:
            1) security vulnerability resolved: glibc/shlibs
               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
    
        This security announcement obsoletes SuSE-SA:2001:001 about glibc (shlibs).
    
        The file globbing (matching filenames against patterns such as "*.bak")
        routines in the glibc exhibits an error that results in a heap corruption
        and that may allow a remote attacker to execute arbitrary commands from
        processes that take globbing strings from user input.
        Tom Parker, Global InterSec LLC, addressed SuSE Security and illustrated
        an attack scenario against the BSD-derived ftp daemon that is installed
        as /usr/sbin/in.ftpd in SuSE Linux distributions. The said in.ftpd should
        not be confused with the Washington University ftp daemon (wu-ftpd) that
        comes installed as /usr/sbin/wu.ftpd in SuSE Linux and uses its own
        globbing functions.
    
        Since the attack against in.ftpd is based on a heap corruption in glibc,
        the proper solution for the error is to exchange the responsible code in
        the glibc globbing functions. It should be expected that other network
        service daemons that accept user-supplied globbing strings such as rsyncd
        can be exploited with this glibc globbing error. There is no satisfactory
        workaround against the problem other than updating the glibc libraries
        with a fixed version. We provide update packages for this purpose.
    
        Users of the SuSE Linux 6.3 distribution should upgrade their systems
        to a newer product since security update support for SuSE Linux 6.3
        has been discontinued two years after the release.
    
        Notes, Special installation instructions:
    
          * If you use YOU (Yast2 Online Update), the necessary update packages
            will be selected automatically. Please consider reading the
            PRECAUTIONS and the AFTERCARE paragraph below. A standalone desktop
            installation should not face any problems with the update as long
            as the system is not loaded during the update process.
    
          * The glibc package consists of one source RPM package and multiple
            binary RPM (sub-) packages. In order to resolve the errors in the
            globbing functions, the source RPM package as well as the
            documentation subpackages do not need to be installed. In fact,
            you only need to install the updates for packages that you have
            installed already on your system.
            The different subpackages contain:
             ++ shared libraries
              + static libraries and header files
              + profiling and debugging versions of glibc
              - timezone description files (package timezone)
              - internationalization files (i18n)
              - two documentation packages
            The packages marked with "+" are necessary to update if they are
            installed on your system. The source RPM does not need to be installed
            unless you want to compile your own glibc binaries.
    
    
          * The names of both the source RPM as well as the binary RPM (sub-)
            packages have changed between different SuSE Linux distributions.
            Overview:
            dist    | source-RPM | shared libs | static libs,header| profiling
           -----------------------------------------------------------------------
            6.4,7.0     libc        shlibs          libc             libd
            7.1,7.2,7.3 glibc       glibc           glibc-devel      glibc-profile
    
            Find out which of the four packages are installed on your system
            according to the package names in the table. Use the command
                rpm -q name_of_package
            to query the package database for each name.
            If you have your package list, download the packages that you need
            from the URLs as listed below. Verify their integrity and authenticity
            following the guidelines as described in section 3) of this security
            announcement.
    
    
          * PRECAUTIONS
            The shared libraries package of the glibc is the most sensitive
            part of a running Linux system, and modifications to it should be
            handled with special care. During the update of the shlibs/glibc
            package, runtime-linking the shared libraries is likely to fail for
            processes that execute a new binary with the execve(2) system call.
            Therefore, we recommend to bring a system to single user mode
            ("init S") to perform the package update. If this is not applicable
            for operational reasons, a system receiving the update should be kept
            as quiet as possible (no shell scripts of any kind, no cron jobs, no
            incoming email).
    
    
          * Update the shared libraries package first using the command
                rpm -Uhv <name-of-package.rpm>
            The execution of this command must not be interrupted!
            Then use the same command ("rpm -Uhv ...") to update the other
            packages. The update of these packages is not critical.
    
    
          * AFTERCARE
            After performing the update, you should run the following command
            on your system:
                /sbin/ldconfig
            ldconfig will rebuild the runtime linker cache. If you use YOU
            (Yast2 Online Update), the ldconfig command will be executed
            automatically at the end of the update.
    
            The shared libraries that were installed on the system before the
            update have been removed from the filesystem, but they are still
            in use by the running applications. Therefore, the diskspace as well
            as the memory will not be freed until the last process that uses
            these files exits. We recommend to reboot the system to workaround
            this problem.
    
        i386 Intel Platform:
    
    
        SuSE-7.3
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/a1/glibc-2.2.4-64.i386.rpm
          ab4f2c0a14df2fc904a77e3093ab64c1
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/d1/glibc-devel-2.2.4-64.i386.rpm
          30fecdf4a05cdbb563f89544d83d3832
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/d2/glibc-profile-2.2.4-64.i386.rpm
          170136831b255f9fb4f7626bb0db118c
        source rpm:
        ftp://ftp.suse.com/pub/suse/i386/update/7.3/zq1/glibc-2.2.4-64.src.rpm
          0e9042c4513fdab17574fcfa00d85a49
    
    
        SuSE-7.2
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/a1/glibc-2.2.2-60.i386.rpm
          7f6986a143c394217e8c25d7a337213b
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/d1/glibc-devel-2.2.2-60.i386.rpm
          ec20c83a27d82909bf244260ce7a5918
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/d2/glibc-profile-2.2.2-60.i386.rpm
          39663b28aa3460b3496543f1fc38bbb8
        source rpm:
        ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/glibc-2.2.2-60.src.rpm
          cdb94c3f69df860a331fcd767464d958
    
    
        SuSE-7.1
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/a1/glibc-2.2-17.i386.rpm
          bfe1b48b0f74b8ebe4887de7f433581d
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/d1/glibc-devel-2.2-17.i386.rpm
          84e3b7aef3d13dda8e938a2d0be2a6a8
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/d2/glibc-profile-2.2-17.i386.rpm
          b4260429e50687c3ec45c330f565aa3d
        source rpm:
        ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/glibc-2.2-17.src.rpm
          8060cd3ce8a70f2e7fbd646586e1ea55
    
    
        SuSE-7.0
        ftp://ftp.suse.com/pub/suse/i386/update/7.0/a1/shlibs-2.1.3-202.i386.rpm
          c5e373b55d91ce4611548cace59015f1
        ftp://ftp.suse.com/pub/suse/i386/update/7.0/d1/libc-2.1.3-202.i386.rpm
          94e0ef7bcb2b1d12e35b2ecf4106e2a3
        ftp://ftp.suse.com/pub/suse/i386/update/7.0/d2/libd-2.1.3-202.i386.rpm
          27b725ec3b2f47609222dabe34798d6e
        source rpm:
        ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/libc-2.1.3-202.src.rpm
          be466007d22952ae08809e4a13cf7f74
    
    
        SuSE-6.4
        ftp://ftp.suse.com/pub/suse/i386/update/6.4/a1/shlibs-2.1.3-204.i386.rpm
          9539d8a62365de6007fc6644ad41cfa6
        ftp://ftp.suse.com/pub/suse/i386/update/6.4/d1/libc-2.1.3-204.i386.rpm
          526f3261e684ecc94f7a3e5447cb47fa
        ftp://ftp.suse.com/pub/suse/i386/update/6.4/d2/libd-2.1.3-204.i386.rpm
          ac0d6067cff50b0b63ca3905a1c5728f
        source rpm:
        ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/libc-2.1.3-204.src.rpm
          0a0332bac56a42898b6e38caeaf8898b
    
    
    
    
        Sparc Platform:
    
        SuSE-7.3
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/a1/glibc-2.2.4-34.sparc.rpm
          ec7a28d3ecd776b855f658bfb5c5c906
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d1/glibc-devel-2.2.4-34.sparc.rpm
          c1b948813f902d357733bc05a844c991
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/d2/glibc-profile-2.2.4-34.sparc.rpm
          5c97f462e33a4d95ba740b82f57dde0c
        source rpm:
        ftp://ftp.suse.com/pub/suse/sparc/update/7.3/zq1/glibc-2.2.4-34.src.rpm
          1346299f187ceeaef241dbf45ff49f51
    
    
        SuSE-7.1
        ftp://ftp.suse.com/pub/suse/sparc/update/7.1/a1/glibc-2.2-18.sparc.rpm
          7562d1fce096b8b28205f1d35d7c127a
        ftp://ftp.suse.com/pub/suse/sparc/update/7.1/d1/glibc-devel-2.2-18.sparc.rpm
          49930f964d3e0269a1cd8d94c1989bc0
        ftp://ftp.suse.com/pub/suse/sparc/update/7.1/d2/glibc-profile-2.2-18.sparc.rpm
          0f5e8c3b667e0809213b3f54f1e50b13
        source rpm:
        ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/glibc-2.2-18.src.rpm
          c836663dd27b4ff476a12b1a8c0c9f90
    
    
        SuSE-7.0
        ftp://ftp.suse.com/pub/suse/sparc/update/7.0/a1/shlibs-2.1.3-160.sparc.rpm
          f2af7ef92554c60bd5a872de208d8b6f
        ftp://ftp.suse.com/pub/suse/sparc/update/7.0/d1/libc-2.1.3-160.sparc.rpm
          7bdb705c7ebd03f4adce09a6809892c2
        ftp://ftp.suse.com/pub/suse/sparc/update/7.0/d2/libd-2.1.3-160.sparc.rpm
          2b3306cb460f478db3429e23f823b995
        source rpm:
        ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/libc-2.1.3-160.src.rpm
          a64566e9fd63300019cfeef8f29f4818
    
    
    
    
        AXP Alpha Platform:
    
        SuSE-7.1
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/a1/glibc-2.2-26.alpha.rpm
          6c859b49dfd1bfcb6a3c641b684d043b
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/d1/glibc-devel-2.2-26.alpha.rpm
          650adc9694f047966d66ced86a4242b6
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/d2/glibc-profile-2.2-26.alpha.rpm
          c6b9e63c4cbfeb4319259ef69588d8ed
        source rpm:
        ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/glibc-2.2-26.src.rpm
          c793e9da8291e45b9323c4fa4e85de67
    
    
        SuSE-7.0
        ftp://ftp.suse.com/pub/suse/axp/update/7.0/a1/shlibs-2.1.3-203.alpha.rpm
          28e5a26227efba257f0c5aa81ecff74f
        ftp://ftp.suse.com/pub/suse/axp/update/7.0/d1/libc-2.1.3-203.alpha.rpm
          64ccdf133939fca4f47082c5092b348f
        ftp://ftp.suse.com/pub/suse/axp/update/7.0/d2/libd-2.1.3-203.alpha.rpm
          471b1a63ebdfcc9df3cf71423ac51b78
        source rpm:
        ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/libc-2.1.3-203.src.rpm
          08e3ef5b96cdd2a647bfd4db7a2cb55f
    
    
        SuSE-6.4
        ftp://ftp.suse.com/pub/suse/axp/update/6.4/a1/shlibs-2.1.3-204.alpha.rpm
          798f75dbfb95b6917f79ed26c48de2fe
        ftp://ftp.suse.com/pub/suse/axp/update/6.4/d1/libc-2.1.3-204.alpha.rpm
          0851f8afd4cf6316263128f406af1df3
        ftp://ftp.suse.com/pub/suse/axp/update/6.4/d2/libd-2.1.3-204.alpha.rpm
          95b0e06e0328d3a4422b9139c5955cc5
        source rpm:
        ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/libc-2.1.3-204.src.rpm
          d52cf0e58f6f8f9ef0749b2c0fca534a
    
    
    
    
        PPC Power PC Platform:
    
        SuSE-7.3
        The update packages are delayed and are currently being built. They
        will be available shortly at the same locations as the 7.1 packages,
        with the 7.3 path segment, respectively.
    
    
        SuSE-7.1
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/a1/glibc-2.2-25.ppc.rpm
          298ad3b4eaf87f3656e096d5eb4f4a4d
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/d1/glibc-devel-2.2-25.ppc.rpm
          6f31f5f7b055485f65e7c81ebf8f9d64
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/d2/glibc-profile-2.2-25.ppc.rpm
          26d70564073e77a610562acf5ae27f1f
        source rpm:
        ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/glibc-2.2-25.src.rpm
          b76a1624d9be6dbb63ceb8803a5ed07f
    
        SuSE-7.0
        ftp://ftp.suse.com/pub/suse/ppc/update/7.0/a1/shlibs-2.1.3-198.ppc.rpm
          472cb2d66abdfb2a523ba57e15613f04
        ftp://ftp.suse.com/pub/suse/ppc/update/7.0/d1/libc-2.1.3-198.ppc.rpm
          37e62fe7376e6f66defc6897abcae74d
        ftp://ftp.suse.com/pub/suse/ppc/update/7.0/d2/libd-2.1.3-198.ppc.rpm
          6e8b150fddc5ea7ab8799b021cb20311
        source rpm:
        ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/libc-2.1.3-198.src.rpm
          b7b73eeb4c091302fff48284f6894d9b
    
        SuSE-6.4
        The update packages are delayed and are currently being built. They
        will be available shortly at the same locations as the 7.0 packages,
        with the 6.4 path segment, respectively.
    
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - /bin/login vulnerabilities
        A buffer overflow vulnerability has been reported for System V derived
        implementations of the login program while it copies environment variables
        from the login prompt to the user's future environment. SuSE Linux
        distributions are unaffected by this problem. The login programs in
        SuSE Linux distributions before and including SuSE Linux 6.1 contain
        the environment copying feature. Versions shipped after (and including)
        SuSE Linux 6.2 use PAM (Pluggable Authentication Module) routines for
        logini- and password prompting. The PAM routines do not support
        environment passing.
    
    ______________________________________________________________________________
    
    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 securityat_private),
           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 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 "buildat_private" 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-securityat_private
            -   general/linux/SuSE security discussion.
                All SuSE security announcements are sent to this list.
                To subscribe, send an email to
                    <suse-security-subscribeat_private>.
    
        suse-security-announceat_private
            -   SuSE's announce-only mailing list.
                Only SuSE's security annoucements are sent to this list.
                To subscribe, send an email to
                    <suse-security-announce-subscribeat_private>.
    
        For general information or the frequently asked questions (faq)
        send mail to:
            <suse-security-infoat_private> or
            <suse-security-faqat_private> respectively.
    
        =====================================================================
        SuSE's security contact is <securityat_private> or <securityat_private>.
        The <securityat_private> 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 <securityat_private>
    pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <buildat_private>
    
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    This archive was generated by hypermail 2b30 : Mon Dec 24 2001 - 11:42:58 PST