[Full-Disclosure] [RHSA-2003:057-06] Updated shadow-utils packages fix exposure

From: bugzilla@redhat.com
Date: 02/20/03

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    From: bugzilla@redhat.com
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    Date: Thu, 20 Feb 2003 13:26 -0500

                       Red Hat, Inc. Red Hat Security Advisory

    Synopsis: Updated shadow-utils packages fix exposure
    Advisory ID: RHSA-2003:057-06
    Issue date: 2003-02-12
    Updated on: 2003-02-18
    Product: Red Hat Linux
    Keywords: mail mailspool
    Cross references:
    CVE Names: CAN-2002-1509

    1. Topic:

    Updated shadow-utils packages correct a bug that caused the useradd tool to
    create mail spools with incorrect permissions.

    2. Relevant releases/architectures:

    Red Hat Linux 7.2 - i386, ia64
    Red Hat Linux 7.3 - i386
    Red Hat Linux 8.0 - i386

    3. Problem description:

    The shadow-utils package includes programs for converting UNIX password
    files to the shadow password format, plus programs for managing user and
    group accounts. One of these programs is useradd and is used to create or
    update new user information.

    When creating a user account, the version of useradd included in Red Hat
    Linux 7.2, 7.3, and 8.0 creates a mailbox file with incorrectly-set
    group ownership. Instead of setting the file's group ownership to the
    'mail' group, it is set to the user's primary group.

    On systems where other users share the same primary group, this would allow
    those users to be able to read and write other user mailboxes.

    These erratum packages contain an updated patch to useradd. Where a 'mail'
    group exists, mailboxes will be created with group 'mail' having read and
    write permissions. Otherwise the mailbox file will be created without
    group read and write permissions.

    All users of Red Hat Linux are advised to update to these erratum packages
    and to also check the /var/spool/mail directory to ensure that all mailbox
    files have appropriate permissions.

    4. Solution:

    Before applying this update, make sure all previously released errata
    relevant to your system have been applied.

    To update all RPMs for your particular architecture, run:

    rpm -Fvh [filenames]

    where [filenames] is a list of the RPMs you wish to upgrade. Only those
    RPMs which are currently installed will be updated. Those RPMs which are
    not installed but included in the list will not be updated. Note that you
    can also use wildcards (*.rpm) if your current directory *only* contains the
    desired RPMs.

    Please note that this update is also available via Red Hat Network. Many
    people find this an easier way to apply updates. To use Red Hat Network,
    launch the Red Hat Update Agent with the following command:


    This will start an interactive process that will result in the appropriate
    RPMs being upgraded on your system.

    5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):

    59810 - useradd creates mail writable for group!!! (PATCH in duplicate bug)

    6. RPMs required:

    Red Hat Linux 7.2:




    Red Hat Linux 7.3:



    Red Hat Linux 8.0:



    7. Verification:

    MD5 sum Package Name
    175d0d2e8a47c91a3746aca0054bc46b 7.2/en/os/SRPMS/shadow-utils-20000902-9.7.src.rpm
    f6d1854e5155dc933b01fd4b701edf2e 7.2/en/os/i386/shadow-utils-20000902-9.7.i386.rpm
    115bfb6de248ecf59a4a50d85c7cb43e 7.2/en/os/ia64/shadow-utils-20000902-9.7.ia64.rpm
    175d0d2e8a47c91a3746aca0054bc46b 7.3/en/os/SRPMS/shadow-utils-20000902-9.7.src.rpm
    f6d1854e5155dc933b01fd4b701edf2e 7.3/en/os/i386/shadow-utils-20000902-9.7.i386.rpm
    0a4abea30939daf0c2f432efca7e35e9 8.0/en/os/SRPMS/shadow-utils-20000902-12.8.src.rpm
    6dd61ab968afbc537e25faea914788bc 8.0/en/os/i386/shadow-utils-20000902-12.8.i386.rpm

    These packages are GPG signed by Red Hat, Inc. for security. Our key
    is available at http://www.redhat.com/about/contact/pgpkey.html

    You can verify each package with the following command:
        rpm --checksig -v <filename>

    If you only wish to verify that each package has not been corrupted or
    tampered with, examine only the md5sum with the following command:
        md5sum <filename>

    8. References:


    9. Contact:

    The Red Hat security contact is <security@redhat.com>. More contact
    details at http://www.redhat.com/solutions/security/news/contact.html

    Copyright 2003 Red Hat, Inc.

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