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Mandrake Linux Security Update Advisory: gdm

Aug 21, 2001, 16:30 (0 Talkback[s])
Date: Mon, 20 Aug 2001 17:10:15 -0600
From: Linux Mandrake Security Team <security@linux-mandrake.com>
Subject: MDKSA-2001:070 - gdm update


                Mandrake Linux Security Update Advisory

Package name:           gdm
Date:                   August 20th, 2001
Advisory ID:            MDKSA-2001:070

Affected versions:      8.0

Problem Description:

 A buffer overrun exists in the XDMCP handling code used in gdm.  By
 sending a properly crafted XDMCP message, it is possible for a remote
 attacker to execute arbitrary commands as root on the susceptible
 machine.  By default, XDMCP is disabled in gdm.conf on Mandrake Linux.



Please verify the update prior to upgrading to ensure the integrity of
the downloaded package.  You can do this with the command:
  rpm --checksig package.rpm
You can get the GPG public key of the Mandrake Linux Security Team at
If you use MandrakeUpdate, the verification of md5 checksum and GPG
signature is performed automatically for you.

Mandrake Linux 8.0:
41c178fc24d9acb2ead1438e837f0325  8.0/RPMS/gdm-
1688432b516b398ad1c20ac80c1d028f  8.0/SRPMS/gdm-

Bug IDs fixed (see https://qa.mandrakesoft.com for more information):


To upgrade automatically, use MandrakeUpdate.

If you want to upgrade manually, download the updated package from one
of our FTP server mirrors and upgrade with "rpm -Fvh *.rpm".

You can download the updates directly from one of the mirror sites
listed at:


Updated packages are available in the "updates/[ver]/RPMS/" directory.
For example, if you are looking for an updated RPM package for
Mandrake Linux 8.0, look for it in "updates/8.0/RPMS/".  Updated source
RPMs are available as well, but you generally do not need to download

Please be aware that sometimes it takes the mirrors a few hours to

You can view other security advisories for Mandrake Linux at:


If you want to report vulnerabilities, please contact


Mandrake Linux has two security-related mailing list services that
anyone can subscribe to:


  Mandrake Linux's security announcements mailing list.  Only
  announcements are sent to this list and it is read-only.


  Mandrake Linux's security discussion mailing list.  This list is open
  to anyone to discuss Mandrake Linux security specifically and Linux
  security in general.

To subscribe to either list, send a message to
with "subscribe [listname]" in the body of the message.

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Optionally, you can use the web interface to subscribe to or unsubscribe
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