OSEC

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Subject: Conectiva Linux Security Announcement - gdm
From: Sergio Bruder (bruderCONECTIVA.COM.BR)
Date: Wed Jun 07 2000 - 08:41:02 CDT


CONECTIVA LINUX SECURITY ANNOUNCEMENT

PACKAGE: gdm

SUMMARY : Remote buffer overflow
DATE : 2000-JUN-06
AFFECTED CONECTIVA VERSIONS : 4.1, 4.2 and 5.0

DESCRIPTION
The gdm program is on of the graphical login choices available
for Conectiva Linux users. A serious vulnerability has been found
in this program during the XDMCP protocol processing that could
lead to remote root compromise.
In order to exploit this vulnerability, the XDMCP option has to
be explicitly enabled in /etc/X11/gdm/gdm.conf. All Conectiva
Linux versions ship with this options DISABLED by default.

SOLUTION
If you need to use XDMCP, then you MUST upgrade the gdm program
to the latest release following the links below. If XDMCP is
disabled in /etc/X11/gdm/gdm.conf, then this vulnerability cannot
be exploited.

DIRECT DOWNLOAD LINKS TO UPDATED PACKAGES:
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.1/i386/gdm-2.0beta4-2cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.2/i386/gdm-2.0beta4-2cl.i386.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/5.0/i386/gdm-2.0beta4-2cl.i386.rpm

SOURCE RPM PACKAGES ARE ALSO AVAILABLE:
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.1/SRPMS/gdm-2.0beta4-2cl.src.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/4.2/SRPMS/gdm-2.0beta4-2cl.src.rpm
ftp://ftp.conectiva.com.br/pub/conectiva/atualizacoes/5.0/SRPMS/gdm-2.0beta4-2cl.src.rpm

All packages are signed with Conectiva's PGP key. The key can be obtained at
http://www.conectiva.com.br/conectiva/contato.html

Information on how to install and/or update packages, and mirror
sites, can be found at http://www.conectiva.com.br/atualizacoes

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