SuSE: 'xinetd' buffer overflow

    Date29 Jun 2001
    CategorySuSE
    2686
    Posted ByLinuxSecurity Advisories
    Zen-parse has reported a bug to Bugtraq which allows remote attackers to overflow a buffer in the logging routine of xinetd.
    
    ______________________________________________________________________________
    
                            SuSE Security Announcement
    
            Package:                xinetd
            Announcement-ID:        SuSE-SA:2001:022
            Date:                   Friday, June 29th 2001, 13:26:55 CEST
            Affected SuSE versions: (6.0, 6.1, 6.2), 6.3, 6.4, 7.0, 7.1, 7.2
            Vulnerability Type:     remote code execution
            Severity (1-10):        7
            SuSE default package:   yes
            Other affected systems: All systems using xinetd
    
        Content of this advisory:
            1) security vulnerability resolved: xinetd buffer-overflows
               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
    
        Zen-parse has reported a bug to Bugtraq which allows remote attackers
        to overflow a buffer in the logging routine of xinetd. During investigation
        we found that more problems exist within xinetd. Xinetd provides its own
        string-handling (snprintf()-like functions) routines and fails to handle
        length arguments of 0 properly. Instead of an immediate return it assumes
        'no limit' for writing characters to the target-buffer. This can lead
        to overflows and arbitrary remote code-execution. Additionally xinetd
        now sets the correct umask before starting other deamons.
        Please update the packages immediately, kill the old deamon and start
        the new xinetd deamon with the
    
              /etc/rc.d/xinetd start
    
        command again if you need it running.
    
        Regardless of the bugs in xinetd, please make sure you only run as many
        services as needed.
    
    
        i386 Intel Platform:
    
        SuSE-7.2
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/n2/xinetd-2.1.8.8p3-139.i386.rpm
          a8122710a857e49a356b0786c8aad9eb
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.2/zq1/xinetd-2.1.8.8p3-139.src.rpm
          90187bd35f931f07ba72b54c16c1549c
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/n2/xinetd-2.1.8.8p3-140.i386.rpm
          346868fe76e17d17d87dadbac4c032bb
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.1/zq1/xinetd-2.1.8.8p3-140.src.rpm
          6656be9789888da5b1b37dc1aa9c69a9
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/n1/xinetd-2.1.8.8p3-140.i386.rpm
          ff001b856db620213608dac1c88ebfbe
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/xinetd-2.1.8.8p3-140.src.rpm
          627d2f09d9d4607f31e1902eee4e0cb5
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/n1/xinetd-2.1.8.8p3-139.i386.rpm
          ef4697d57a6ceb5e6a55bde51268b92a
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/xinetd-2.1.8.8p3-139.src.rpm
          1384b48ed19204324d4a8c2f75d3ea20
    
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/n1/xinetd-2.1.8.8p3-141.i386.rpm
          3c29917f0688aa7509f98b0a00a38eed
        source rpm:
         ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/xinetd-2.1.8.8p3-141.src.rpm
          b7f8cc1e5a7d3c2f6c56040c327a4b20
    
    
        Sparc Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/n2/xinetd-2.1.8.8p3-89.sparc.rpm
          a78dd53e2da211b8822b4ca86359a6e0
        source rpm:
         ftp://ftp.suse.com/pub/suse/sparc/update/7.1/zq1/xinetd-2.1.8.8p3-89.src.rpm
          9b0acb0dacee2962f19057de43d9f421
    
    
        AXP Alpha Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/n2/xinetd-2.1.8.8p3-96.alpha.rpm
          bb2b45d56d2cf54733a20561c8a8e440
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.1/zq1/xinetd-2.1.8.8p3-96.src.rpm
          60610276aba8c103a43a40ea0366f675
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/n1/xinetd-2.1.8.8p3-96.alpha.rpm
          1e4f0685f380db64025837685f8e79c2
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/7.0/zq1/xinetd-2.1.8.8p3-96.src.rpm
          addfd497500387b4de4e2c77ff226e01
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/n1/xinetd-2.1.8.8p3-95.alpha.rpm
          f39287594d3297d2625f3878be6b7d98
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/xinetd-2.1.8.8p3-95.src.rpm
          ea727667791cd774a5df8bcb5b8b2870
    
        SuSE-6.3
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/n1/xinetd-2.1.8.8p3-95.alpha.rpm
          364120a5e0ba13587efba8c082faafa0
        source rpm:
         ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/xinetd-2.1.8.8p3-95.src.rpm
          08c540c506809a9a5b080aa21fe97406
    
    
        PPC Power PC Platform:
    
        SuSE-7.1
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/n2/xinetd-2.1.8.8p3-102.ppc.rpm
          b73446661fe3f5967acd0242e83fb815
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.1/zq1/xinetd-2.1.8.8p3-102.src.rpm
          c89cb923d3c837e50e7f2efc2c9708d2
    
        SuSE-7.0
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/n1/xinetd-2.1.8.8p3-101.ppc.rpm
          01fec52a269c456636bcda0d8401b639
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/7.0/zq1/xinetd-2.1.8.8p3-101.src.rpm
          f91f365e3cbedc3de52aab7667db97b2
    
        SuSE-6.4
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/n1/xinetd-2.1.8.8p3-101.ppc.rpm
          ed8e343b428fe812502195a15d9c4219
        source rpm:
         ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/xinetd-2.1.8.8p3-101.src.rpm
          a340276cec8a5dedcbcd29e199bef6a1
    
    
    ______________________________________________________________________________
    
    2)  Pending vulnerabilities in SuSE Distributions and Workarounds:
    
        - rxvt
    
          The rxvt program contains a buffer-overflow which allows an attacker
          to locally execute arbitrary code under a different group-id. Please
          update to the newest rxvt packages.
    
        - dqs
    
          The dsh-program, shipped with the dqs package contains a buffer-overflow
          which allows local attackers to execute arbitrary code as root.
          Please update to the newest packages.
    
        - pcp
    
          A /tmp - race has been found in the pcp package which allows
          a local attacker to escalate his priviledges.
    
          Affected versions: 7.1, 7.2.
    
          We thank Mark Goodwin and Keith Owens from SGI who quickly responded
          to SuSE in this issue and who released a fixed version of the SGI
          Performance Co-Pilot in response to the security problem. Future SuSE
          Linux releases will include the most recent version of the package.
    
          Workaround: chmod a-s `rpm -ql pcp` /nosuchfile
          update-package does the same.
    
    
    ______________________________________________________________________________
    
    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 This email address is being protected from spambots. You need JavaScript enabled to view it.),
           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 "This email address is being protected from spambots. You need JavaScript enabled to view it." 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:
    
        This email address is being protected from spambots. You need JavaScript enabled to view it.
            -   general/linux/SuSE security discussion.
                All SuSE security announcements are sent to this list.
                To subscribe, send an email to
                    <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
    
        This email address is being protected from spambots. You need JavaScript enabled to view it.
            -   SuSE's announce-only mailing list.
                Only SuSE's security annoucements are sent to this list.
                To subscribe, send an email to
                    <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
    
        For general information or the frequently asked questions (faq)
        send mail to:
            <This email address is being protected from spambots. You need JavaScript enabled to view it.> or
            <This email address is being protected from spambots. You need JavaScript enabled to view it.> respectively.
    
        ===================================================
        SuSE's security contact is <This email address is being protected from spambots. You need JavaScript enabled to view it.>.
        The <This email address is being protected from spambots. You need JavaScript enabled to view it.> 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 <This email address is being protected from spambots. You need JavaScript enabled to view it.>
    pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <This email address is being protected from spambots. You need JavaScript enabled to view it.>
    
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