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Neohapsis > Archives > Bugtraq> 2001-04

From: secureCONECTIVA.COM.BR
Date: Mon Apr 09 2001 - 13:22:55 CDT

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : xntp3
SUMMARY : Remote buffer overflow
DATE : 2001-04-09 15:07:00
ID : CLA-2001:392
RELEVANT
RELEASES : 4.0, 4.0es, 4.1, 4.2, 5.0, prg graficos, ecommerce, 5.1, 6.0

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DESCRIPTION
"xntp3" is a package used to syncronize clocks between computers on a
network.
Przemyslaw Frasunek published an exploit that demonstrates a buffer
overflow vulnerability in that package. This vulnerability can be
exploited remotely and is aggravated by the fact that the xntpd
daemon runs as root.

SOLUTION
All users of the xntp3 package should upgrade immediately.
The update for Conectiva Linux 6.0 incorporates a patch from Chris
Wing for CAEN-Linux that allows the xntpd daemon to run as a regular
user and still be able to set the system clock.
Conectiva Linux 6.0 users using apt-get to update their systems
should execute the following command:

apt-get install xntp3

instead of the usual "apt-get upgrade". This is necessary because
this update, besides fixing the security problem, requires a new
package, libcap. This library (which in turn uses capabilities) is
used by xntpd so that it can set the system clock without being root.

ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:
- add the following line to /etc/apt/sources.list if it is not there yet
(you may also use linuxconf to do this):

rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

- run: apt-get update
- after that, execute: apt-get upgrade

Detailed instructions reagarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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subscribe: conectiva-updates-subscribepapaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribepapaleguas.conectiva.com.br
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