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From: FreeBSD Security Advisories (security-advisoriesFreeBSD.org)
Date: Wed Feb 07 2001 - 13:42:07 CST

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    =============================================================================
    FreeBSD-SA-01:20 Security Advisory
                                                                    FreeBSD, Inc.

    Topic: mars_nwe contains potential remote root compromise

    Category: ports
    Module: mars_nwe
    Announced: 2001-02-07
    Credits: Przemyslaw Frasunek <venglinFREEBSD.LUBLIN.PL>
    Affects: Ports collection prior to the correction date.
    Corrected: 2001-01-30
    Vendor status: Vendor notified
    FreeBSD only: NO

    I. Background

    mars_nwe is a Novell Netware server emulator.

    II. Problem Description

    The mars_nwe port, versions prior to 0.99.b19_1, contains a remote
    format string vulerability. Because of this vulnerability, a
    malicious remote user sending specially-crafted packets may be able to
    execute arbitrary code on the local system, potentially gaining root
    access.

    The mars_nwe port is not installed by default, nor is it "part of
    FreeBSD" as such: it is part of the FreeBSD ports collection, which
    contains over 4500 third-party applications in a ready-to-install
    format. The ports collections shipped with FreeBSD 3.5.1 and 4.2
    contain this problem since it was discovered after the releases.

    FreeBSD makes no claim about the security of these third-party
    applications, although an effort is underway to provide a security
    audit of the most security-critical ports.

    III. Impact

    Malicious remote users may cause arbitrary code to be executed
    on the local system, potentially gaining root access.

    If you have not chosen to install the mars_nwe port/package, then
    your system is not vulnerable to this problem.

    IV. Workaround

    Deinstall the mars_nwe port/package, if you have installed it.

    V. Solution

    One of the following:

    1) Upgrade your entire ports collection and rebuild the mars_nwe port.

    2) Deinstall the old package and install a new package dated after the
    correction date, obtained from:

    [i386]
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/net/mars_nwe-0.99.b19_1.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/net/mars_nwe-0.99.b19_1.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/net/mars_nwe-0.99.b19_1.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/net/mars_nwe-0.99.b19_1.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/net/mars_nwe-0.99.b19_1.tgz

    [alpha]
    Packages are not automatically generated for the alpha architecture at
    this time due to lack of build resources.

    3) download a new port skeleton for the mars_nwe port from:

    http://www.freebsd.org/ports/

    and use it to rebuild the port.

    4) Use the portcheckout utility to automate option (3) above. The
    portcheckout port is available in /usr/ports/devel/portcheckout or the
    package can be obtained from:

    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/devel/portcheckout-2.0.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/devel/portcheckout-2.0.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/devel/portcheckout-2.0.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
    ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/devel/portcheckout-2.0.tgz

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