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