Bug 102452 - CAN-2003-0548/9 XDMCP GDM DoS
CAN-2003-0548/9 XDMCP GDM DoS
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 2.1
Classification: Red Hat
Component: gdm (Show other bugs)
2.1
All Linux
medium Severity medium
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Assigned To: Havoc Pennington
Mike McLean
: Security
Depends On:
Blocks:
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Reported: 2003-08-15 07:35 EDT by Mark J. Cox (Product Security)
Modified: 2007-11-30 17:06 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2003-08-21 12:10:02 EDT
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Description Mark J. Cox (Product Security) 2003-08-15 07:35:50 EDT
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 (Product Security) 2003-08-21 12:10:02 EDT
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

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