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PROGENY-SA-2001-06: Remote vulnerability in cfingerd


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Date: Thu, 19 Apr 2001 15:58:30 -0500
From: Progeny Security Team <[email protected]>
To: [email protected]
Subject: PROGENY-SA-2001-06: Remote vulnerability in cfingerd

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 ---------------------------------------------------------------------------
 PROGENY LINUX SYSTEMS -- SECURITY ADVISORY               PROGENY-SA-2001-06
 ---------------------------------------------------------------------------

    Topic:          Remote vulnerability in cfingerd

    Category:       net
    Module:         cfingerd
    Announced:      2001-04-11
    Credits:        Megyer Laszlo <[email protected]>
    Affects:        Progeny Debian (cfingerd prior to 1.4.1-1.1)
                    Debian GNU/Linux (cfingerd prior to 1.4.1-1.1)
    Vendor-Status:  New Version Released (cfingerd_1.4.1-1.1)
    Corrected:      2001-04-19
    Progeny Only:   NO

    $Id: PROGENY-SA-2001-06,v 1.5 2001/04/19 20:53:30 jdaily Exp $

 ---------------------------------------------------------------------------


SYNOPSIS

The cfingerd package, a customizable finger daemon, contains a remote
root vulnerability in Progeny versions prior to 1.4.1-1.1.


PROBLEM DESCRIPTION

The bug exists in main.c where it passes input from an ident string to
the printf()-like format specifier in syslog().  It is possible to
overwrite things in the daemon's memory space and thus obtain root.


IMPACT

This bug could enable an attacker to obtain root access on a machine
connected to a network.


SOLUTION

Upgrade to a fixed version of cfingerd.  You may use Progeny's
cfingerd package version 1.4.1-1.1 or greater.


WORKAROUND

cfingerd is often not an essential tool for a system.  If desired, one
may remove it from a Progeny Debian system instead of upgrading.  This
command may be used to remove cfingerd:

  dpkg --remove cfingerd


UPDATING VIA APT-GET

 1. Ensure that your /etc/apt/sources.list file has a URI for Progeny's
    security update repository:

        deb http://archive.progeny.com/progeny updates/newton/

 2. Update your cache of available packages for apt(8).

    Example:

        # apt-get update

 3. Using apt(8), install the new ssh package.  apt(8) will download
    the update, verify it's integrity with md5, and then install the
    package on your system with dpkg(8).

    Example:

        # apt-get install cfingerd


UPDATING VIA DPKG

 1. Using your preferred FTP/HTTP client to retrieve the following
    updated files from Progeny's update archive at:

    http://archive.progeny.com/pub/progeny/updates/newton/

    Filename                             MD5 Checksum
    ------------------------------------ --------------------------------
    cfingerd_1.4.1-1.1_i386.deb          91115911a62b234a355c3c48053af98c

    Example:

        # wget http://archive.progeny.com/progeny/updates/newton/cfingerd_1.4.1-1.1_i386.deb

 2. Use the md5sum command on the retrieved file to verify that it matches
    the md5sum provided in this advisory:

    Example:

        # md5sum cfingerd_1.4.1-1.1_i386.deb

 3. Then install the replacement package(s) using the dpkg command.

    Example:

        # dpkg --install cfingerd_1.4.1-1.1_i386.deb


MORE INFORMATION

This bug was originally documented in a post to the BUGTRAQ mailing
list, available at http://www.securityfocus.com/archive/1/176087.

Progeny advisories can be found at http://www.progeny.com/security/.

 ---------------------------------------------------------------------------

pub  1024D/F92D4D1F 2001-04-04 Progeny Security Team <[email protected]>

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