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