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Progeny alert PROGENY-SA-2001-26 (cfingerd)

From:	 Progeny Security Team <security@progeny.com>
To:	 progeny-security-announce@lists.progeny.com,
	 progeny-debian@lists.progeny.com, bugtraq@securityfocus.com,
	 linuxlist@securityportal.com
Subject: PROGENY-SA-2001-26: Remote vulnerability in cfingerd
Date:	 Tue, 14 Aug 2001 16:25:45 -0500 (EST)
Cc:	 Progeny Security Team <security@progeny.com>

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 ---------------------------------------------------------------------------
 PROGENY SERVICE NETWORK -- SECURITY ADVISORY             PROGENY-SA-2001-26
 ---------------------------------------------------------------------------

    Synopsis:       Remote vulnerability in cfingerd

    Software:       cfingerd

    History:
         2001-06-21 Vulnerability announced
         2001-08-14 Update available in Progeny archive

    Credits:        Steven Van Acker <deepstar@ulyssis.org>

    Affects:        Progeny Debian (cfingerd prior to 1.4.1-1.2progeny1)

    Progeny Only:   NO

    Vendor-Status:  New Version Released
                    (cfingerd_1.4.1-1.2progeny1)


    $Progeny: security/advisory/PROGENY-SA-2001-26,v 1.13 2001/08/14 20:03:19 dsp Exp $

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


SUMMARY

The cfingerd package, a customizable finger daemon, contains a local
root vulnerability in Progeny versions prior to 1.4.1-1.2progeny1.

cfingerd is not installed by default on Progeny systems.

DETAILED DESCRIPTION

When the option ALLOW_LINE_PARSING is set (it is set by default), a
buffer overflow can occur.  This may be exploited by local users to gain
elevated privileges.  Additionally, a printf call in util.c did not
protect against printf format attacks.

SOLUTION (See also: UPDATING VIA APT-GET)

Upgrade to a fixed version of cfingerd.  Version 1.4.1-1.2progeny1
corrects the problem. For your convenience, you may upgrade to the
cfingerd_1.4.1-1.2progeny1 package.


UPDATING VIA APT-GET

 1. Ensure that your /etc/apt/sources.list file has a URI for Progeny's
    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 package. apt(8) will download the
    update, verify its integrity with md5, and then install the
    package on your system with dpkg(8).

    Example:

        # apt-get install cfingerd


UPDATING VIA DPKG

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

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

    MD5 Checksum                     Filename
    -------------------------------- ------------------------------------- 
    14a8b47a807d9a2ae19b6e89b1dbcea6 cfingerd_1.4.1-1.2progeny1_i386.deb

    Example:

        $ wget \
        http://archive.progeny.com/progeny/updates/newton/cfingerd_1.4.1-1.2progeny1_i386.deb

 2. Use the md5sum(1) command on the retrieved files to verify that
    they match the MD5 checksum provided in this advisory:

    Example:

        $ md5sum cfingerd_1.4.1-1.2progeny1_i386.deb

 3. Then install the replacement package(s) using dpkg(8).

    Example:

        # dpkg --install cfingerd_1.4.1-1.2progeny1_i386.deb


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

MORE INFORMATION

This bug was originally documented in a post to the BUGTRAQ mailing
list, available at http://www.securityfocus.com/archive/1/192844

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


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

pub  1024D/F92D4D1F 2001-04-04 Progeny Security Team <security@progeny.com>

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