[Full-Disclosure] [RHSA-2004:175-01] Updated utempter package fixes vulnerability

bugzilla_at_redhat.com
Date: 04/30/04

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    To: redhat-watch-list@redhat.com, bugtraq@securityfocus.com, full-disclosure@lists.netsys.com
Date: Fri, 30 Apr 2004 15:32 -0400

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                       Red Hat Security Advisory

    Synopsis: Updated utempter package fixes vulnerability
    Advisory ID: RHSA-2004:175-01
    Issue date: 2004-04-30
    Updated on: 2004-04-30
    Product: Red Hat Linux
    Keywords:
    Cross references:
    Obsoletes:
    CVE Names: CAN-2004-0233
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    1. Topic:

    An updated utempter package that fixes a potential symlink vulnerability is
    now available.

    2. Relevant releases/architectures:

    Red Hat Linux 9 - i386

    3. Problem description:

    Utempter is a utility that allows terminal applications such as xterm and
    screen to update utmp and wtmp without requiring root privileges.

    Steve Grubb discovered a flaw in Utempter which allowed device names
    containing directory traversal sequences such as '/../'. In combination
    with an application that trusts the utmp or wtmp files, this could allow a
    local attacker the ability to overwrite privileged files using a symlink.

    Users should upgrade to this new version of utempter, which fixes this
    vulnerability.

    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:

    up2date

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

    If up2date fails to connect to Red Hat Network due to SSL
    Certificate Errors, you need to install a version of the
    up2date client with an updated certificate. The latest version of
    up2date is available from the Red Hat FTP site and may also be
    downloaded directly from the RHN website:

    https://rhn.redhat.com/help/latest-up2date.pxt

    5. RPMs required:

    Red Hat Linux 9:

    SRPMS:
    ftp://updates.redhat.com/9/en/os/SRPMS/utempter-0.5.5-2.RHL9.0.src.rpm

    i386:
    ftp://updates.redhat.com/9/en/os/i386/utempter-0.5.5-2.RHL9.0.i386.rpm

    6. Verification:

    MD5 sum Package Name
    - --------------------------------------------------------------------------

    b7f13df830c3f64eef6c6895edfb3b1f 9/en/os/SRPMS/utempter-0.5.5-2.RHL9.0.src.rpm
    b207cd5661c7d687c3503399ce3bb611 9/en/os/i386/utempter-0.5.5-2.RHL9.0.i386.rpm

    These packages are GPG signed by Red Hat for security. Our key is
    available from https://www.redhat.com/security/team/key.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>

    7. References:

    http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0233

    8. Contact:

    The Red Hat security contact is <secalert@redhat.com>. More contact
    details at https://www.redhat.com/security/team/contact.html

    Copyright 2004 Red Hat, Inc.
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