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Bug 102452

Summary:	CAN-2003-0548/9 XDMCP GDM DoS
Product:	Red Hat Enterprise Linux 2.1	Reporter:	Mark J. Cox <mjc>
Component:	gdm	Assignee:	Havoc Pennington <hp>
Status:	CLOSED ERRATA	QA Contact:	Mike McLean <mikem>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	2.1	Keywords:	Security
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2003-08-21 16:10:02 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mark J. Cox 2003-08-15 11:35:50 UTC

Two bugs have been found in the X Display Manager Control Protocol (XDMCP)
which could allow a denial of service attack (DoS) by crashing the gdm
daemon. The Common Vulnerabilities and Exposures project (cve.mitre.org)
has assigned the names CAN-2003-0548 and CAN-2003-0549 to these issues.

This attack is only possible if XDMCP is enabled. XDMCP is not enabled by
default in Red Hat Enterprise Linux distributions. In addition is
documented best practise that XDMCP should only ever be run on trusted
networks.

Note that Red Hat Enterprise Linux 2.1 is not vulnerable to CAN-2003-0547,
a vulnerability that allows a local user to read any text file, as it did
not have the "examine session errors" feature (bug 102275)

Comment 1 Mark J. Cox 2003-08-21 16:10:02 UTC

An errata has been issued which should help the problem described in this bug report. 
This report is therefore being closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files, please follow the link below. You may reopen 
this bug report if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2003-259.html