-----BEGIN PGP SIGNED MESSAGE----- [ For Public Release ] __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SunOS Vulnerability in x-lock (Update to Bulletin H-54, Vulnerability in x-lock) August 13, 1997 19:00 GMT Number H-95 ______________________________________________________________________________ PROBLEM: A buffer overflow condition exists in some implementations of xlock. PLATFORM: Solaris 2.x, SunOS 4.1.4, 4.1.3_U1, SunOS 5.x. DAMAGE: Local users may gain root privileges. SOLUTION: Apply patches listed below. ______________________________________________________________________________ VULNERABILITY Exploit information involving this vulnerability has been made ASSESSMENT: publicly available. Sun STRONGLY RECOMMENDS that you install the patches immediately. ______________________________________________________________________________ [ Start Sun Microsystems Advisory ] ______________________________________________________________________________ Sun Microsystems, Inc. Security Bulletin Bulletin Number: #00150 Date: August 12, 1997 Cross-Ref: CERT CA-97.13 Title: Vulnerability in xlock ______________________________________________________________________________ Permission is granted for the redistribution of this Bulletin, so long as the Bulletin is not edited and is attributed to Sun Microsystems. Portions may also be excerpted for re-use in other security advisories so long as proper attribution is included. Any other use of this information without the express written consent of Sun Microsystems is prohibited. Sun Microsystems expressly disclaims all liability for any misuse of this information by any third party. ______________________________________________________________________________ 1. Bulletins Topics Sun announces the release of patches for Solaris 2.5.1, 2.5, 2.4, 2.3, (SunOS 5.5.1, 5.5, 5.4, 5.3), SunOS 4.1.4, and 4.1.3_U1, which relate to a vulnerability in the xlock program. Sun strongly recommends that you install the patches listed in section 4 immediately on systems running SunOS 5.5.1, 5.5, 5.4, 5.3, 4.1.4, and 4.1.3_U1. Exploit information is publicly available. 2. Who is Affected Vulnerable: SunOS versions 5.5.1, 5.5.1_x86, 5.5, 5.5_x86, 5.4, 5.4_x86, 5.3, 4.1.4, and 4.1.3_U1 The vulnerability is fixed in the upcoming release of Solaris. 3. Understanding the Vulnerability The xlock program locks the local X display until the user supplies a password. Due to insufficient bounds checking on arguments supplied to xlock it is possible to overwrite the stack space of the xlock program. As xlock is setuid root, this vulnerability may be exploited by users on a system to gain root access. 4. List of Patches The vulnerability in xlock is fixed by the following patches: OS version Patch ID __________ ________ SunOS 5.5.1 103566-20 SunOS 5.5.1_x86 105109-01 SunOS 5.5 103210-20 SunOS 5.5_x86 105108-01 SunOS 5.4 102057-38 SunOS 5.4_x86 105110-01 SunOS 5.3 101362-50 SunOS 4.1.4 100478-02 SunOS 4.1.3_U1 100478-02 5. Checksum Table The checksum table below shows the BSD checksums (SunOS 4.1.x: /bin/sum; SunOS 5.x: /usr/ucb/sum), SVR4 checksums (SunOS 5.x: /usr/bin/sum), and the MD5 digital signatures for the above-mentioned patches that are available from: These checksums may not apply if you obtain patches from your answer centers. File Name BSD SVR4 MD5 _______________ _________ __________ _______________________________ 103566-20.tar.Z 01319 3189 4044 6378 D7534B10A32CC600972973B39850A622 105109-01.tar.Z 44172 144 14499 287 16CEC591C71EE814E8475EC62EAF2903 103210-20.tar.Z 45065 3270 36740 6540 E413A4D5CD4A43F3ACDDDF3E78628099 105108-01.tar.Z 55743 143 43259 286 8EA202FF2C7D2FEA47424FBA53F11FA2 102057-38.tar.Z 09646 1909 60808 3817 D3C1FEB1C242DDD68BAA4F56DB70CD3F 105110-01.tar.Z 05813 130 30121 260 2CE9A43C4F38D787AFAAE92E57287553 101362-50.tar.Z 12142 6482 58259 12964 887B3277462D9051D4630C7A753855C3 100478-02.tar.Z 09802 60 47925 120 1981F145B09AAAC7B73193FF82DDF8D5 ______________________________________________________________________________ APPENDICES A. Patches listed in this bulletin are available to all Sun customers via World Wide Web at: Customers with Sun support contracts can also obtain patches from local Sun answer centers and SunSITEs worldwide. B. Sun security bulletins are available via World Wide Web at: C. To report or inquire about a security problem with Sun software, contact one or more of the following: - Your local Sun answer centers - Your representative computer security response team, such as CERT - Sun Security Coordination Team. Send email to: security-alert@sun.com D. 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 Coordinaton Team. 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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. ______________________________________________________________________________ [End Sun Microsystems Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of Sun Microsystems for the information contained in this bulletin. ______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. 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If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. 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LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) H-85: INN News Server Vulnerabilities H-86: ld.so Vulnerability H-87: HP-UX rlogin Vulnerability H-88: SGI IRIX talkd Vulnerability H-89: SunSO talkd Buffer Overrun Vulnerability H-90: SunOS, Solaris NIS+ Vulnerability H-91: HP-UX Large UID's and GID's Vulnerability H-92: HP-UX X11/Motif Lib & Novell Netware Vulerabilities H-93: SGI IRIX ordist Buffer Overrun Vulnerability H-94: Vulnerability in ps -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBM/IurrnzJzdsy3QZAQFVYQQA33HnSPZoQSysPgRhfLvP4Htdcb25jxca nmI7O8sNXSlMgsxghcYzS8P0sqJUDeMQctZFYBSSVZE3vqz/k8WdfuQlrIi2Ye7L nL0LoT3iZqbeCUGbyvYylSMwNmuq1EQTMFOVNFevZ59lW1vrdciVof37BmP51+QO xp7ooT9+OzU= =jUHJ -----END PGP SIGNATURE-----