SuSE: 2001:022 High Severity: xinetd Buffer Overflow Risk

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______________________________________________________________________________

                        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
      
      a8122710a857e49a356b0786c8aad9eb
    source rpm:
      
      90187bd35f931f07ba72b54c16c1549c

    SuSE-7.1
      
      346868fe76e17d17d87dadbac4c032bb
    source rpm:
      
      6656be9789888da5b1b37dc1aa9c69a9

    SuSE-7.0
      
      ff001b856db620213608dac1c88ebfbe
    source rpm:
      
      627d2f09d9d4607f31e1902eee4e0cb5

    SuSE-6.4
      
      ef4697d57a6ceb5e6a55bde51268b92a
    source rpm:
      
      1384b48ed19204324d4a8c2f75d3ea20

    SuSE-6.3
      
      3c29917f0688aa7509f98b0a00a38eed
    source rpm:
      
      b7f8cc1e5a7d3c2f6c56040c327a4b20


    Sparc Platform:

    SuSE-7.1
      
      a78dd53e2da211b8822b4ca86359a6e0
    source rpm:
      
      9b0acb0dacee2962f19057de43d9f421


    AXP Alpha Platform:

    SuSE-7.1
      
      bb2b45d56d2cf54733a20561c8a8e440
    source rpm:
      
      60610276aba8c103a43a40ea0366f675

    SuSE-7.0
      
      1e4f0685f380db64025837685f8e79c2
    source rpm:
      
      addfd497500387b4de4e2c77ff226e01

    SuSE-6.4
      
      f39287594d3297d2625f3878be6b7d98
    source rpm:
      
      ea727667791cd774a5df8bcb5b8b2870

    SuSE-6.3
      
      364120a5e0ba13587efba8c082faafa0
    source rpm:
      
      08c540c506809a9a5b080aa21fe97406


    PPC Power PC Platform:

    SuSE-7.1
      
      b73446661fe3f5967acd0242e83fb815
    source rpm:
      
      c89cb923d3c837e50e7f2efc2c9708d2

    SuSE-7.0
      
      01fec52a269c456636bcda0d8401b639
    source rpm:
      
      f91f365e3cbedc3de52aab7667db97b2

    SuSE-6.4
      
      ed8e343b428fe812502195a15d9c4219
    source 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 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   .


  - 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-subscribe@suse.com>.

    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
                <suse-security-announce-subscribe@suse.com>.

    For general information or the frequently asked questions (faq)
    send mail to:
        <suse-security-info@suse.com> or
        <suse-security-faq@suse.com> respectively.

    ==================================================    SuSE's security contact is <security@suse.com>.
    The <security@suse.com> 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 <security@suse.de>
pub  1024D/9C800ACA 2000-10-19 SuSE Package Signing Key <build@suse.de>

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