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AUSCERT External Security Bulletin Redistribution
ESB-2005.0579 -- Sun Alert Notification 101478
Security Vulnerability Involving the Common Desktop Environment (CDE)
dtlogin(1X) Command When Parsing XDMCP Requests (CERT VU#179804)
22 July 2005
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AusCERT Security Bulletin Summary
---------------------------------
Product: dtlogin
Publisher: Sun Microsystems
Operating System: Solaris 9
Solaris 8
Solaris 7
Impact: Root Compromise
Denial of Service
Access: Remote/Unauthenticated
CVE Names: CAN-2004-0368
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-101478-1
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Sun(sm) Alert Notification
* Sun Alert ID: 101478 (formerly 57539)
* Synopsis: Security Vulnerability Involving the Common Desktop
Environment (CDE) dtlogin(1X) Command When Parsing XDMCP Requests
(CERT VU#179804)
* Category: Availability
* Product: Solaris 9 Operating System, Solaris 7 Operating System,
Solaris 8 Operating System
* BugIDs: 5022437
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 07-May-2004, 03-Aug-2004
* Date Closed: 03-Aug-2004
* Date Modified: 10-May-2004, 11-Jun-2004, 03-Aug-2004
1. Impact
A local or remote unprivileged user may be able to gain unauthorized
root privileges or cause a denial of service due to a "double-free"
vulnerability in the CDE login service dtlogin(1X) which can be
triggered when parsing invalid X Display Manager Control Protocol
(XDMCP) packets. If the dtlogin(1X) program is killed, users will be
unable to login on any Sun Ray devices attached to the server, and the
console will display the command line login prompt.
This issue is also described in CERT Vulnerability VU #179804 (see
http://www.kb.cert.org/vuls/id/179804)
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 7 without patch 107180-31
* Solaris 8 without patch 108919-21
* Solaris 9 without patch 112807-09
x86 Platform
* Solaris 7 wthout patch 107181-31
* Solaris 8 without patch 108920-21
* Solaris 9 without patch 114210-08
This issue may occur on systems running dtlogin(1X). To determine if
dtlogin(1X) is running on a system, use the "ps" command as shown
below:
% ps -ef | grep dtlogin
3. Symptoms
If an application core file is captured for this issue, it will be
found in "/core" and will contain a stack trace similar to the
following:
core 'core' of 2999: /usr/dt/bin/dtlogin -daemon
ff310dd8 XdmcpDisposeARRAY8 (0, 0, fef66fc0, fef6a680, ff080fe4, 0) + 4
ff310e74 XdmcpDisposeARRAYofARRAY8 (ffbffb70, 0, 0, 0, ffbffc44, ff) + 1c
00025528 request_respond (ffbffc44, 20, 6, ffbffbfc, 6, 0) + 464
00024398 ProcessRequestSocket (6, 43c00, 1ac, ffbffc44, 270, 18) + 244
00023f68 WaitForSomething (40, 20, 3f400, 6, 3ec00, 1) + 208
000190e8 main (2, 0, 48618, 48400, ffbffe7c, 48400) + 338
00015b68 _start (0, 0, 0, 0, 0, 0) + 10
4. Relief/Workaround
If dtlogin(1X) exits unexpectedly, it may be restarted using the
following command as root:
# /etc/init.d/dtlogin start
To reduce the possibility of the described issue from occurring,
network administrators should block UDP(7P) packets to port 177 across
any firewall where XDMCP remote session service is not required.
If no graphical login access is required for local console users, Sun
Ray devices, or remote XDMCP sessions, dtlogin(1X) may be disabled
completely by running the following command as root:
# /usr/dt/bin/dtconfig -d
and then stop the currently running dtlogin:
# /usr/dt/bin/dtconfig -kill
If XDMCP remote session access to a machine is not required at all,
but graphical login access for the console and/or Sun Ray devices is
required, dtlogin(1X) can be configured to not listen for XDMCP
connections by editing the "/etc/dt/config/Xconfig file" and removing
the "#" symbol at the beginning of the following line:
# Dtlogin.requestPort 0
If the "/etc/dt/config/Xconfig" file does not exist, create it by
doing the following:
# mkdir -p /etc/dt/config
# cp /usr/dt/config/Xconfig /etc/dt/config
# /etc/init.d/dtlogin reset
Note: Controlling access via the access control list in the "Xaccess"
file is not effective at preventing this issue.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 7 with patch 107180-31 or later
* Solaris 8 with patch 108919-21 or later
* Solaris 9 with patch 112807-09 or later
x86 Platform
* Solaris 7 with patch 107181-31 or later
* Solaris 8 with patch 108920-21 or later
* Solaris 9 with patch 114210-08 or later
Change History
10-May-2004:
* Updated Contributing Factors and Resolution sections
11-Jun-2004:
* Updated Relief/Workaround section
03-Aug-2004:
* State: Resolved
* Updated Contributing Factors and Resolution sections
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2005 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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