-----BEGIN PGP SIGNED MESSAGE----- [ For Public Release ] __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN SunOS chkey Vulnerability (Update to vendor patches in H-59) June 25, 1997 16:00 GMT Number H-73 ______________________________________________________________________________ PROBLEM: A buffer overflow vulnerability has been identified in the chkey program. PLATFORM: SunOS versions 5.3-5.5.1 (Solaris 2.3-2.5.1) for SPARC and PC. DAMAGE: This vulnerability may allow local users to gain root privileges. SOLUTION: Apply vendor patches or workarounds. ______________________________________________________________________________ VULNERABILITY Sun strongly recommends that you install the patches listed in ASSESSMENT: section 4 immediately on systems running SunOS 5.5.1, 5.5, and 5.4. Sun also strong recommends that you install the workaround listed in section 5 immediately on systems running SunOS 5.3. ______________________________________________________________________________ [ Start Sun Microsystems Advisory ] - ------------------------------------------------------------------------------ Sun Microsystems, Inc. Security Bulletin Bulletin Number: #00144 Date: June 24 1997 Cross-Ref: AUSCERT AA 97.18 Title: Vulnerability in chkey - ------------------------------------------------------------------------------ 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, and 2.4, (SunOS 5.5.1, 5.5, and 5.4), that relate to a vulnerability in the chkey program. Sun estimates that the release of a patch for Solaris 2.3 (SunOS 5.3) that relate to the same vulnerability will be available within 16 weeks of the date of this bulletin. Sun strongly recommends that you install the patches listed in section 4 immediately on systems running SunOS 5.5.1, 5.5, and 5.4. Sun also strongly recommends that you install the workaround listed in section 5 immediately on systems running SunOS 5.3. Exploit information for chkey 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, and 5.3. Not vulnerable: All other supported versions of SunOS The vulnerability is fixed in the upcoming release of Solaris. 3. Understanding the Vulnerability The program chkey is used to change a user's secure RPC Diffie-Hellman public key and secret key pair. Due to insufficient bounds checking on arguments passed to the chkey program, it is possible to overwrite the internal data space of chkey while it is executing. As chkey has setuid root permissions, this vulnerability may allow non-privileged users to gain root access. 4. Workaround Sun recommends, as a workaround, the installation of a wrapper that was developed by AUSCERT (see AUSCERT Advisory AA-97.18). AUSCERT maintains an FTP service at ftp://ftp/auscert/org.au/pub and a World Wide Web service at http://www.auscert.org.au. 5. List of Patches The vulnerability in chkey is fixed by the following patches: OS version Patch ID ---------- -------- SunOS 5.5.1 104968-01 SunOS 5.5.1_x86 104969-01 SunOS 5.5 104971-01 SunOS 5.5_x86 104972-01 SunOS 5.4 104973-01 SunOS 5.4_x86 104974-01 SunOS 5.3 101318-89 (to be released in 16 weeks) 6. Checksum Table The checksum table below shows the BSD checksums (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: ftp://sunsolve1.sun.com/pub/patches/patches.html These checksums may not apply if you obtain patches from your answer centers. File Name BSD SVR4 MD5 - --------------- --------- --------- -------------------------------- 104968-01.tar.Z 42439 112 58380 224 D468EDAF62453686D9744601BC69B52B 104969-01.tar.Z 29618 112 5311 224 4C6F5D9D18A38BD8B54B76B8137F63BD 104971-01.tar.Z 31970 112 5776 223 34AD0B220C2495B73DBC621D88CF988B 104972-01.tar.Z 49195 112 35168 224 D6CF025F259437335625EF325196F51D 104973-01.tar.Z 64330 115 23425 230 D50F404FC7DB918DB556F38F7DBF8816 104974-01.tar.Z 54484 112 33221 223 42B484654CD4C7F8EB7A9B54BC9061FB - ------------------------------------------------------------------------------ Sun acknowledges with thanks AUSCERT for their assistance in the preparation of this bulletin. Sun and AUSCERT are members of FIRST, the Forum of Incident Response and Security Teams. For more information about FIRST, visit the FIRST web site at "http://www.first.org/". - ------------------------------------------------------------------------------ APPENDICES A. Patches listed in this bulletin are available to all Sun customers via World Wide Web at: ftp://sunsolve1.sun.com/pub/patches/patches.html 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: http://sunsolve1.sun.com/sunsolve/secbulletins 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. 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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, Inc. & AUSCERT 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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