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Four Vulnerabilities in the Common Desktop Environment



Four Vulnerabilities in the Common Desktop Environment Privacy and Legal Notice

CIAC INFORMATION BULLETIN

K-001: Four Vulnerabilities in the Common Desktop Environment

(Updates to CERT Advisory CA-99-11)

October 11, 1999 16:00 GMT, Updated December 29, 1999
PROBLEM:       Multiple vulnerabilities exist in some distributions of the
               Common Desktop Environment (CDE).
PLATFORM:      Any system running the Common Desktop Environment (CDE).
DAMAGE:        Each vulnerability may allow arbitrary code on a vulnerable
               system to be run as root by a local user. The ToolTalk
               ttsession vulnerability may also allow arbitrary code to be run
               as root by a remote user.
SOLUTION:      Apply available vendor patches.

VULNERABILITY Risk is high. These vulnerabilities have been published on the ASSESSMENT: internet. Each vulnerability, independent of the others, can lead to a total system compromise.
Appended on December 29, 1999 with additional patch updates from Sun Microsystems. [Start CERT Advisory] CERT Advisory CA-99-11 Four Vulnerabilities in the Common Desktop Environment Original release date: September 13, 1999 Last revised: October 04, 1999 Updated vendor information for Sun Microsystems, Inc. Source: CERT/CC A complete revision history is at the end of this file. Systems Affected * Systems running the Common Desktop Environment (CDE) I. Description Multiple vulnerabilities have been identified in some distributions of the Common Desktop Environment (CDE). These vulnerabilities are different from those discussed in CA-98.02. We recommend that you install appropriate vendor patches as soon as possible (see Section III below). Until you can do so, we encourage you to disable or uninstall vulnerable copies of the CDE package. Note that disabling these programs will severely affect the utility of the CDE environment. At this time, the CERT/CC has not received any reports of these vulnerabilities being exploited by intruders. Vulnerability #1: ToolTalk ttsession uses weak RPC authentication mechanism The ToolTalk messaging server ttsession allows independent applications to communicate without having direct knowledge of each other. Applications can communicate through an associated ttsession which delivers messages via RPC calls between interested agents. On many systems, ttsession uses AUTH_UNIX authentication (a client-based security option) by default. When messages are received, ttsession uses certain environment variables supplied by the client to determine how the message is handled. Because of this, the ttsession process can be manipulated to execute unauthorized arbitrary programs with the privileges of the running ttsession. Vulnerability #2: CDE dtspcd relies on file-system based authentication The network daemon dtspcd (a CDE desktop subprocess control program) accepts CDE requests from clients to execute commands and launch applications remotely. When a client makes a request, the dtspcd daemon asks the client to create a file that has a predictable name so that the daemon can authenticate the request. If a local user can manipulate the files used for authentication, then that user can craft arbitrary commands that may run as root. Vulnerability #3: CDE dtaction buffer overflow The dtaction utility allows applications or shell scripts that otherwise are not connected into the CDE development environment, to request that CDE actions be performed. A buffer overflow can occur in some implementations of dtaction when a username argument greater than 1024 bytes is used. Vulnerability #4: CDE ToolTalk shared library buffer overflow in TT_SESSION There is a vulnerability in some implementations of the ToolTalk shared library which allows the TT_SESSION environment variable buffer to overflow. A setuid root program using a vulnerable ToolTalk library, such as dtsession, can be exploited to run arbitrary code as root. II. Impact Vulnerability #1: ToolTalk ttsession uses weak RPC authentication mechanism A local or remote user may be able to use this vulnerability to run commands on a vulnerable system with the same privileges of the attacked ttsession. For this attack to work, a ttsession must be actively running on the system attacked. The ttsession daemon is started whenever a user logs in using the CDE desktop, or upon interaction with CDE at some future point. Vulnerability #2: CDE dtspcd relies on file-system based authentication A vulnerable dtspcd may allow a local user to run arbitrary commands as root. Vulnerability #3: CDE dtaction buffer overflow A local user may be able to exploit this vulnerability to execute arbitrary code with root privileges. Vulnerability #4: CDE ToolTalk shared library buffer overflow in TT_SESSION A local user may be able to exploit this vulnerability to execute arbitrary code with root privileges. III. Solution Install appropriate patches from your vendor We recommend installing vendor patches as soon as possible and disabling the vulnerable programs until you can do so (or uninstalling the entire CDE package if not needed). Note that disabling these programs will severely affect the utility of the CDE environment. Appendix A contains information provided by vendors for this advisory. We will update the appendix as we receive more information. If you do not see your vendor's name, the CERT/CC did not hear from that vendor. Please contact your vendor directly. Appendix A. Vendor Information Compaq Computer Corporation Problem #1 CDE ToolTalk session daemon & ToolTalk shared library overflow This potential security problem has been resolved and a patch for this problem has been made available for Tru64 UNIX V4.0D, V4.0E, V4.0F and V5.0. This patch can be installed on: V4.0D-F, all patch kits V5.0, all patch kits *This solution will be included in a future distributed release of Compaq's Tru64/ DIGITAL UNIX. This patch may be obtained from the World Wide Web at the following FTP address: http://www.service.digital.com/patches The patch file name is SSRT0617_ttsession.tar.Z Problem #2 Compaq's Tru64/DIGITAL UNIX is not vulnerable. Problem #3 CDE dtaction buffer overflow This potential security problem has been resolved and a patch for this problem has been made available for Tru64 UNIX V4.0D, V4.0E and V4.0F. This patch can be installed on: V4.0D Patch kit BL11 or BL12 V4.0E Patch kit BL1 or BL12 V4.0F Patch kit BL1 *This solution will be included in a future distributed release of Compaq's Tru64/ DIGITAL UNIX. This patch may be obtained from the World Wide Web at the following FTP address: http://www.service.digital.com/patches The patch file name is SSRT0615U_dtaction.tar.Z Problem #4 CDE ToolTalk shared library overflow See solution fix described in Problem #1. Data General DG/UX is not subject to any of these vulnerabilities. Fujitsu Fujitsu's UXP/V operating system is not vulnerable to any of these vulnerabilities. Hewlett-Packard Company HP-9000 Series 700/800 HP-UX releases 10.X and 11.0 systems with CDE patches previously recommended in HP Security Bulletins are not vulnerable to vulnerabilities #2, #3, and #4. All HP-UX 10.X and 11.0 systems running CDE are vulnerable to vulnerability #1. [Start Hewlett-Packard Company Update] HP Support Information Digests ============================================================================== o HP Electronic Support Center World Wide Web Service --------------------------------------------------- If you subscribed through the HP Electronic Support Center and would like to be REMOVED from this mailing list, access the HP Electronic Support Center on the World Wide Web at: http://us-support.external.hp.com Login using your HP Electronic Support Center User ID and Password. Then select Support Information Digests. You may then unsubscribe from the appropriate digest. ============================================================================== Digest Name: Daily Security Bulletins Digest Created: Mon Sep 20 3:00:03 PDT 1999 Table of Contents: Document ID Title --------------- ----------- HPSBUX9909-103 Security Vulnerability in CDE ttsession (Rev.01) The documents are listed below. ------------------------------------------------------------------------------ Document ID: HPSBUX9909-103 Date Loaded: 19990919 Title: Security Vulnerability in CDE ttsession (Rev.01) ------------------------------------------------------------------------- **REVISED 01** HEWLETT-PACKARD COMPANY SECURITY BULLETIN: #00103, 14 Sep. 99 Last Revised: 20 Sep. 99 ------------------------------------------------------------------------- The information in the following Security Bulletin should be acted upon as soon as possible. Hewlett-Packard Company will not be liable for any consequences to any customer resulting from customer's failure to fully implement instructions in this Security Bulletin as soon as possible. ------------------------------------------------------------------------- PROBLEM: ttsession uses weak RPC authentication mechanism PLATFORM: HP-9000 Series 700/800 HP-UX releases 10.X & 11.00 running CDE. DAMAGE: Allows remote and local users to execute programs with the privileges of the running ttsession. SOLUTION: **REVISED 01** Install the applicable patch. AVAILABILITY: The patches for 10.2X and 11.00 are available now. NOTE: This bulletin will be revised when other patches are available. CHANGE SUMMARY: This revision affects only HP-UX release 10.24. ------------------------------------------------------------------------- I. A. Background This problem has been reported in CERT Advisory CA-99-11. The advisory reports four vulnerabilities: #1: ToolTalk ttsession uses weak RPC authentication mechanism #2: CDE dtspcd relies on file-system based authentication #3: CDE dtaction buffer overflow #4: CDE ToolTalk shared library buffer overflow in TT_SESSION With the patches recommended in previous security bulletins HP-UX releases 10.X and 11.00 are not vulnerable to #2, #3, nor #4. To avoid vulnerability #1 install the applicable patch below. B. Fixing the problem - Install the applicable patch: HP-UX release 10.10 In progress; HP-UX release 10.20 PHSS_19747; ------->>>> HP-UX release 10.24 PHSS_19819; HP-UX release 11.00 PHSS_19748. Note: HP-UX release 10.30 was a development release prior to the availability of HP-UX release 11.00. HP-UX release 10.30 will not be patched. C. To subscribe to automatically receive future NEW HP Security Bulletins from the HP Electronic Support Center via electronic mail, do the following: Use your browser to get to the HP Electronic Support Center page at: http://us-support.external.hp.com (for US, Canada, Asia-Pacific, & Latin-America) http://europe-support.external.hp.com (for Europe) Login with your user ID and password (or register for one). Remember to save the User ID assigned to you, and your password. Once you are in the Main Menu: To -subscribe- to future HP Security Bulletins, click on "Support Information Digests". To -review- bulletins already released from the main Menu, click on the "Search Technical Knowledge Database." Near the bottom of the next page, click on "Browse the HP Security Bulletin Archive". Once in the archive there is another link to our current Security Patch Matrix. Updated daily, this matrix categorizes security patches by platform/OS release, and by bulletin topic. The security patch matrix is also available via anonymous ftp: us-ffs.external.hp.com ~ftp/export/patches/hp-ux_patch_matrix D. To report new security vulnerabilities, send email to security-alert@hp.com Please encrypt any exploit information using the security-alert PGP key, available from your local key server, or by sending a message with a -subject- (not body) of 'get key' (no quotes) to security-alert@hp.com. Permission is granted for copying and circulating this Bulletin to Hewlett-Packard (HP) customers (or the Internet community) for the purpose of alerting them to problems, if and only if, the Bulletin is not edited or changed in any way, is attributed to HP, and provided such reproduction and/or distribution is performed for non-commercial purposes. Any other use of this information is prohibited. HP is not liable for any misuse of this information by any third party. ________________________________________________________________________ -----End of Document ID: HPSBUX9909-103-------------------------------------- [End Hewlett-Packard Company Update] IBM Corporation All releases of AIX version 4 are vulnerable to vulnerabilities #1, #3, and #4. AIX is not vulnerable to #2. The following APARs will be available soon: AIX 4.1.x: IY03125 IY03847 AIX 4.2.x: IY03105 IY03848 AIX 4.3.x: IY02944 IY03849 Customers that do not require the CDE desktop functionality can disable CDE by restricting access to the CDE daemons and removing the dt entry from /etc/inittab. Run the following commands as root to disable CDE: # /usr/dt/bin/dtconfig -d # chsubserver -d -v dtspc # chsubserver -d -v ttdbserver # chsubserver -d -v cmsd # chown root.system /usr/dt/bin/* # chmod 0 /usr/dt/bin/* For customers that require the CDE desktop functionality, a temporary fix is available via anonymous ftp from: ftp://aix.software.ib m.com/aix/efixes/security/cdecert.tar.Z Filename sum md5 ================================================================= dtaction_4.1 32885 18 82af470bbbd334b240e874ff6745d8ca dtaction_4.2 52162 18 b10f21abf55afc461882183fbd30e602 dtaction_4.3 56550 19 6bde84b975db2506ab0cbf9906c275ed libtt.a_4.1 29234 2132 f5d5a59956deb8b1e8b3a14e94507152 libtt.a_4.2 21934 2132 73f32a73873caff06057db17552b8560 libtt.a_4.3 12154 2118 b0d14b9fe4a483333d64d7fd695f084d ttauth 56348 31 495828ea74ec4c8f012efc2a9e6fa731 ttsession_4.1 19528 337 bfac4a06b90cbccc0cd494a44bd0ebc9 ttsession_4.2 46431 338 05949a483c4e390403055ff6961b0816 ttsession_4.3 54031 339 e1338b3167c7edf899a33520a3adb060 NOTE - This temporary fix has not been fully regression tested. Use the following steps (as root) to install the temporary fix. 1. Uncompress and extract the fix. # uncompress < cdecert.tar.Z | tar xf - # cd cdecert 2. Replace the vulnerable executables with the temporary fix for your version of AIX. # (cd /usr/dt/lib && mv libtt.a libtt.a.before_security_fix) # (cd /usr/dt/bin && mv ttsession ttsession.before_security_fix) # (cd /usr/dt/bin && mv dtaction dtaction.before_security_fix) # chown root.system /usr/dt/lib/libtt.a.before_security_fix # chown root.system /usr/dt/bin/ttsession.before_security_fix # chown root.system /usr/dt/bin/dtaction.before_security_fix # chmod 0 /usr/dt/lib/libtt.a.before_security_fix # chmod 0 /usr/dt/bin/ttsession.before_security_fix # chmod 0 /usr/dt/bin/dtaction.before_security_fix # cp ./libtt.a_ /usr/dt/lib/libtt.a # cp ./ttsession_ /usr/dt/bin/ttsession # cp ./dtaction_ /usr/dt/bin/dtaction # cp ./ttauth /usr/dt/bin/ttauth # chmod 555 /usr/dt/lib/libtt.a # chmod 555 /usr/dt/bin/ttsession # chmod 555 /usr/dt/bin/dtaction # chmod 555 /usr/dt/bin/ttauth IBM AIX APARs may be ordered using Electronic Fix Distribution (via the FixDist program), or from the IBM Support Center. For more information on FixDist, and to obtain fixes via the Internet, please reference http://techsu pport.services.ibm.com/support/rs6000.support/downloads or send electronic mail to "aixserv@austin.ibm.com" with the word "FixDist" in the "Subject:" line. To facilitate ease of ordering all security related APARs for each AIX release, security fixes are periodically bundled into a cumulative APAR. For more information on these cumulative APARs including last update and list of individual fixes, send electronic mail to "aixserv@austin.ibm.com" with the word "subscribe Security_APARs" in the "Subject:" line. Santa Cruz Operation, Inc. SCO is investigating these vulnerabilities on SCO UnixWare 7. Other SCO products (OpenServer 5.0.x, UnixWare 2.1.x, Open Server / Open Desktop 3.0 and CMW+) are not vulnerable as CDE is not a component of these releases. SCO will make patches and status information available at http://www.sco.com/security. Silicon Graphics, Inc. SGI acknowledges the CDE vulnerabilities reported and is currently investigating. No further information is available at this time. As further information becomes available, additional advisories will be issued via the normal SGI security information distribution methods including the wiretap mailing list. Until SGI has more definitive information to provide, customers are encouraged to assume all security vulnerabilities as exploitable and take appropriate steps according to local site security policies and requirements. The SGI Security Headquarters Web page is accessible at the URL http://www.sgi.com/Support/secur ity/security.html Sun Microsystems, Inc. Vulnerability #1: Systems running Solaris 7, 2.6, and systems running Solaris 2.5.1, 2.5, and 2.4 installed with CDE are vulnerable if the UNIX authentication mechanism (default) is used. Sun recommends that sites using CDE use DES as the authentication mechanism. To set the authentication mechanism to DES, use the ttsession command with the '-a' option and specify 'des' as the argument (see ttsession(1) for more information). The use of DES authentication also requires that the system uses Secure NFS, NIS+, or keylogin. For more information about Secure NFS, NIS+, or keylogin, please see the System Administration Guide, Volume II. Information is also available at: http://docs.sun.com:80/ab2/coll.47.8/SYSADV2/@Ab2PageView/34908?DwebQuery=s ecure+rpc Sun is producing patches for this vulnerability that will not require the use of the DES authentication mechanism. Vulnerability #2: The following patches are available: CDE version SunOS version Patch ID ___________ _____________ _________ 1.3 5.7 108221-01 1.3_x86 5.7_x86 108222-01 1.2 5.6 108199-01 1.2_x86 5.6_x86 108200-01 1.0.2 5.5.1, 5.5, 5.4 108205-01 1.0.2_x86 5.5.1_x86, 5.5_x86, 5.4_x86 108206-01 1.0.1 5.5, 5.4 108252-01 1.0.1_x86 5.5_x86, 5.4_x86 108253-01 Vulnerability #3: The following patches are available: CDE version SunOS version Patch ID ___________ _____________ _________ 1.3 5.7 108219-01 1.3_x86 5.7_x86 108220-01 1.2 5.6 108201-01 1.2_x86 5.6_x86 108202-01 Patches for CDE versions 1.0.2 and 1.0.1 are in progress. Vulnerability #4: The following patches are available: SunOS version Patch ID _____________ _________ 5.7 107893-02 5.7_x86 107894-02 Patches for other supported versions are in progress. _____________________________________________________________________________ The CERT Coordination Center would like to thank Job de Haas for reporting these vulnerabilities and working with the vendors to effect fixes. We would also like to thank Solutions Atlantic for their efforts in coordinating vendor solutions. ______________________________________________________________________________ This document is available from: http://www.cert.org/advisories/CA-99-11- CDE.html _____________________________________________________________________________ 2Revision History Oct 04, 1999: Updated vendor information for Sun Microsystems, Inc. Oct 01, 1999: Added vendor information for Data General Sep 13, 1999: Initial release [End CERT Advisory] [ Start Sun Microsystems Advisory ] ________________________________________________________________________________ Sun Microsystems, Inc. Security Bulletin Bulletin Number: #00192 Date: December 29, 1999 Cross-Ref: CERT CA-99-11 Title: CDE and OpenWindows ________________________________________________________________________________ The information contained in this Security Bulletin is provided "AS IS." Sun makes no warranties of any kind whatsoever with respect to the information contained in this Security Bulletin. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY WARRANTY OF NON-INFRINGEMENT OR IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE HEREBY DISCLAIMED AND EXCLUDED TO THE EXTENT ALLOWED BY APPLICABLE LAW. IN NO EVENT WILL SUN MICROSYSTEMS, INC. BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES HOWEVER CAUSED AND REGARDLESS OF ANY THEORY OF LIABILITY ARISING OUT OF THE USE OF OR INABILITY TO USE THE INFORMATION CONTAINED IN THIS SECURITY BULLETIN, EVEN IF SUN MICROSYSTEMS, INC. HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. If any of the above provisions are held to be in violation of applicable law, void, or unenforceable in any jurisdiction, then such provisions are waived to the extent necessary for this disclaimer to be otherwise enforceable in such jurisdiction. ________________________________________________________________________________ 1. Bulletin Topics Sun announces the release of patches for Solaris(tm) 7, 2.6, 2.5.1, 2.5, 2.4, 2.3 (SunOS(tm) 5.7, 5.6, 5.5.1, 5.5, 5.4, 5.3), and SunOS 4.1.4, and 4.1.3_U1 which relate to various vulnerabilities in CDE and OpenWindows. Sun recommends that you install the patches listed in section 4 immediately on systems running SunOS 5.7, 5.6, 5.5.1, 5.5, 5.4, 5.3, 4.1.4, and 4.1.3_U1. 2. Who is Affected Vulnerable: SunOS 5.7, 5.7_x86, 5.6, 5.6_x86, 5.5.1, 5.5, 5.4, 5.3, 4.1.4, and 4.1.3_U1. Not vulnerable: All other supported versions of SunOS. 3. Understanding the Vulnerabilities The following vulnerabilities have been identified. 3.1 ToolTalk ttsession default authentication mechanism insecure The ToolTalk messaging utility, ttsession, allows independent applications to communicate without having direct knowledge of each other. The ttsession daemon is started automatically by any program that needs to send or receive a ToolTalk message. It uses AUTH_UNIX authentication by default. A local or remote attacker may manipulate certain environment variables (which are used by ttsession to determine how client messages are handled) to execute arbitrary commands with the privileges of the running ttsession. 3.2 CDE dtspcd relies on file-system based authentication The CDE desktop subprocess control program (dtspcd) is a network daemon that accepts requests from clients to execute commands and launch applications remotely. By manipulating predictable files used for authentication, a local attacker may exploit this vulnerability to execute arbitrary commands and gain root access. 3.3 CDE dtaction buffer overflow The dtaction utility allows applications or shell scripts, which are otherwise not connected into the CDE user environment, to request CDE actions be performed. A buffer overflow vulnerability has been discovered which may be exploited by a local attacker to execute arbitrary instructions and gain root access. 3.4 CDE ToolTalk shared library buffer overflow in TT_SESSION A buffer overflow vulnerability has been discovered in the ToolTalk shared library which may be exploited by a local attacker to execute arbitrary instructions and gain root access. 4. List of Patches Patches for vulnerability described in section 3.1 SunOS version Patch ID _____________ _________ 5.7 107893-04 5.7_x86 107894-04 5.6 105802-11 5.6_x86 105803-13 5.5.1 104489-10 5.5.1_x86 105496-08 5.5 104428-08 5.5_x86 105495-06 5.4 102734-05 108636-01 (see Note 1) 5.4_x86 108641-01 108637-01 (see Note 1) 5.3 Patch will be available in 2 weeks 4.1.4, 4.1.3_U1 Patch will be available in 2 weeks Note 1: Install patch if CDE 1.0.2 or 1.0.1 is installed. Patches for vulnerability described in section 3.2 CDE version SunOS version Patch ID ___________ _____________ _________ 1.3 5.7 108221-01 1.3_x86 5.7_x86 108222-01 1.2 5.6 108199-01 1.2_x86 5.6_x86 108200-01 1.0.2 5.5.1, 5.5, 5.4 108205-01 1.0.2_x86 5.5.1_x86, 5.5_x86, 5.4_x86 108206-01 1.0.1 5.5, 5.4 108252-01 1.0.1_x86 5.5_x86, 5.4_x86 108253-01 Patches for vulnerability described in section 3.3 CDE version SunOS version Patch ID ___________ _____________ _________ 1.3 5.7 108219-01 1.3_x86 5.7_x86 108220-01 1.2 5.6 108201-01 1.2_x86 5.6_x86 108202-01 1.0.2 5.5.1, 5.5, 5.4 108289-02 1.0.2_x86 5.5.1_x86, 5.5_x86, 5.4_x86 108290-03 1.0.1 5.5, 5.4 108254-01 1.0.1_x86 5.5_x86, 5.4_x86 108255-01 Patches for vulnerability described in section 3.4 SunOS version Patch ID _____________ _________ 5.7 107893-04 5.7_x86 107894-04 5.6 105802-11 5.6_x86 105803-13 5.5.1 104489-10 5.5.1_x86 105496-08 5.5 104428-08 5.5_x86 105495-06 5.4 102734-05 108636-01 (see Note 2) 5.4_x86 108641-01 108637-01 (see Note 2) 5.3 101495-04 4.1.4, 4.1.3_U1 100626-10 Note 2: Install patch if CDE 1.0.2 or 1.0.1 is installed. _______________________________________________________________________________ APPENDICES A. Patches listed in this bulletin are available to all Sun customers at: http://sunsolve.sun.com/pub-cgi/show.pl?target=patches/patch-license&nav=pub-patches B. Checksums for the patches listed in this bulletin are available at: ftp://sunsolve.sun.com/pub/patches/CH ECKSUMS C. Sun security bulletins are available at: http://sunsolve.sun.com/pub-cgi/sec Bulletin.pl D. Sun Security Coordination Team's PGP key is available at: http://sunsolve.sun.com/pgpkey.txt E. To report or inquire about a security problem with Sun software, contact one or more of the following: - Your local Sun Solution Center - Your representative computer security response team, such as CERT - Sun Security Coordination Team. Send email to: security-alert@sun.com F. To receive information or subscribe to our CWS (Customer Warning System) mailing list, send email to: security-alert@sun.com with a subject line (not body) containing one of the following commands: Command Information Returned/Action Taken _______ _________________________________ help An explanation of how to get information key Sun Security Coordination Team's PGP key list A list of current security topics query [topic] The email is treated as an inquiry and is forwarded to the Security Coordination Team report [topic] The email is treated as a security report and is forwarded to the Security Coordination Team. Please encrypt sensitive mail using Sun Security Coordination Team's PGP key send topic A short status summary or bulletin. For example, to retrieve a Security Bulletin #00138, supply the following in the subject line (not body): send #138 subscribe Sender is added to our mailing list. To subscribe, supply the following in the subject line (not body): subscribe cws your-email-address Note that your-email-address should be substituted by your email address. unsubscribe Sender is removed from the CWS mailing list. ________________________________________________________________________________ Copyright 1999 Sun Microsystems, Inc. All rights reserved. Sun, Sun Microsystems, Solaris and SunOS are trademarks or registered trademarks of Sun Microsystems, Inc. in the United States and other countries. This Security Bulletin may be reproduced and distributed, provided that this Security Bulletin is not modified in any way and is attributed to Sun Microsystems, Inc. and provided that such reproduction and distribution is performed for non-commercial purposes. [ End Sun Microsystems Advisory ]

CIAC wishes to acknowledge the contributions of CERT Coordination Center, Hewlett-Packard Company, and Sun Microsystems for the information contained in this bulletin.

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