SuSE Security Announcement: screen

6 Sep 2000


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______________________________________________________________________________

                        SuSE Security Announcement

        Package:                screen
        Date:                   Wednesday, September 6th, 2000 19:35 MEST
        Affected SuSE versions: 5.3, 6.0, 6.1, 6.2, 6.3, 6.4, 7.0
        Vulnerability Type:     local root compromise
        Severity (1-10):        8
        SuSE default package:   yes
        Other affected systems: all linux systems with the screen program
                                installed suid root

    Content of this advisory:
        1) security vulnerability resolved: screen
           problem description, discussion, solution and upgrade information
        2) pending vulnerabilities, temporary workarounds
        3) standard appendix (further information)

<p>______________________________________________________________________________

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

    screen, a tty multiplexer, is installed suid root by default on SuSE
    Linux distributions. By supplying a thoughtfully designed string as
    the visual bell message, local users can obtain root privilege.
    Exploit information has been published on security forums.

    The temporary workaround for this problem would be to remove the suid
    bit from /usr/bin/screen*. This also requires mode changes in the
    /tmp/screens directory where the pipes for communication between
    the client and server part of screen are placed upon start of screen.

    SuSE provides an update for the vulnerable screen package. 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 package from locations desribed 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.

<p>    i386 Intel Platform:

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/ap1/screen-3.9.8-1.i386.rpm
      84b6330f0b9ac7600cc5ec53a9dfdbe9
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/7.0/zq1/screen-3.9.8-1.src.rpm
      883d80abf603a4eab2238a4e857301e2

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/ap1/screen-3.9.8-0.i386.rpm
      52f451ce0c8c49e02311dd16961aa028
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/6.4/zq1/screen-3.9.8-0.src.rpm
      a3cb0fb2c90664c6deb986fcbf4e74fd

    SuSE-6.3
    ftp://ftp.suse.com/pub/suse/i386/update/6.3/ap1/screen-3.9.8-0.i386.rpm
      2c244140d346b16a3d5fb77e2cf1f860
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/6.3/zq1/screen-3.9.8-0.src.rpm
      2c84eadb44a5694dc3088000fff5ec82

    SuSE-6.2
    ftp://ftp.suse.com/pub/suse/i386/update/6.2/ap1/screen-3.9.8-0.i386.rpm
      a72973a281467a1b390453ba2cbf3b59
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/6.2/zq1/screen-3.9.8-0.src.rpm
      a379e5b4ca81cf4118002c3064d1c3da

    SuSE-6.1
    ftp://ftp.suse.com/pub/suse/i386/update/6.1/ap1/screen-3.9.8-0.i386.rpm
      d64479b7ba3740299acf717fe36c3834
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/6.1/zq1/screen-3.9.8-0.src.rpm
      e0b08bc5887c40d9f6e3176936c7150b

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

    SuSE-5.3
    ftp://ftp.suse.com/pub/suse/i386/update/5.3/ap1/screen-3.9.8-0.i386.rpm
      cd3ef3bc018973d8907000a8a23bafb6
    source rpm:
    ftp://ftp.suse.com/pub/suse/i386/update/5.3/zq1/screen-3.9.8-0.src.rpm
      f94c9664219649a2f2100344a88cdd22

<p><p>    Sparc Platform:

    SuSE-7.0
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/ap1/screen-3.9.8-0.sparc.rpm
      3adce8a1bcf2464266d5db728b8d8af9
    source rpm:
    ftp://ftp.suse.com/pub/suse/sparc/update/7.0/zq1/screen-3.9.8-0.src.rpm
      26b1186598be0f873732fa5bf7b7b77b

<p><p>    AXP Alpha Platform:

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/ap1/screen-3.9.8-0.alpha.rpm
      aa64d979f33d3c03b5bc0c5074892df8
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/6.4/zq1/screen-3.9.8-0.src.rpm
      11f2261b54e8a329c8b0d1bfd9d0c96f

    SuSE-6.3
    ftp://ftp.suse.com/pub/suse/axp/update/6.3/ap1/screen-3.9.8-0.alpha.rpm
      8e5acd8e3fe9efa7d82e2710489c7300
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/6.3/zq1/screen-3.9.8-0.src.rpm
      6a1c04d9dd4f8c351e189a38f6f5d614

    SuSE-6.1
    ftp://ftp.suse.com/pub/suse/axp/update/6.1/ap1/screen-3.9.8-0.alpha.rpm
      54828e3e9f0c72cc022fb35660c687e8
    source rpm:
    ftp://ftp.suse.com/pub/suse/axp/update/6.1/zq1/screen-3.9.8-0.src.rpm
      e1ff18f05b40afa7849e7d07ae5b8755

<p>    PPC Power PC Platform:

    SuSE-6.4
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/ap1/screen-3.9.8-0.ppc.rpm
      7418b948cf1e92622814c8aae3fa9aa6
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/6.4/zq1/screen-3.9.8-0.src.rpm
      25c8979ec0f63f09a3e39cdadf2ef657

    SuSE-6.3
    ftp://ftp.suse.com/pub/suse/ppc/update/6.3/ap1/screen-3.9.8-0.ppc.rpm
      ea459ccb8c91b293e8b2b321df39be89
    source rpm:
    ftp://ftp.suse.com/pub/suse/ppc/update/6.3/zq1/screen-3.9.8-0.src.rpm
      aa87f61ec2fa912be6c83711c0630129

______________________________________________________________________________

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.

     - 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-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>.
    ===============================================

Regards,
Roman Drahtmüller.
- - -- 
 -                                                                      -
| Roman Drahtmüller      <draht@suse.de> //          "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 <security@suse.de>

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draht＠suse.de

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