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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2004.0338 -- NetBSD Security Advisory 2004-007 Systrace systrace_exit() local root 13 May 2004 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kernel Publisher: NetBSD Operating System: NetBSD-current NetBSD 2.0 branch Impact: Root Compromise Access Required: Existing Account - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- NetBSD Security Advisory 2004-007 ================================= Topic: Systrace systrace_exit() local root Version: NetBSD-current: source prior to Apr 16, 2004 netBSD 2.0 branch: source prior to Apr 16, 2004 netBSD 1.6.2: not affected NetBSD 1.6.1: not affected NetBSD 1.6: not affected NetBSD-1.5.3: not affected NetBSD-1.5.2: not affected NetBSD-1.5.1: not affected NetBSD-1.5: not affected Severity: local root exploit Fixed: NetBSD-current: Apr 17, 2004 NetBSD-2.0 branch: Apr 17, 2004 (2.0 will include the fix) Abstract ======== A local user that is allowed to use /dev/systrace can obtain root access. Technical Details ================= systrace_exit() did not check if the connection to systrace was owned by the super user, and would set euid to 0 on exit. Solutions and Workarounds ========================= *** Patching from sources: The fix for this issue is contained in the one file, sys/kern/kern_systrace.c The following table lists the fixed revisions and dates of this file for each branch: CVS branch revision date ------------- ----------- ---------------- HEAD 1.38 2004/04/17 netbsd-2-0 1.37.2.1 2004/04/17 The following instructions describe how to upgrade your kernel binaries by updating your source tree and rebuilding and installing a new version of the kernel. In these instructions, replace: BRANCH with the appropriate CVS branch (from the above table) ARCH with your architecture (from uname -m), and KERNCONF with the name of your kernel configuration file. To update from CVS, re-build, and re-install the kernel: # cd src # cvs update -d -P -r BRANCH sys/kern/sysv_shm.c # cd sys/arch/ARCH/conf # config KERNCONF # cd ../compile/KERNCONF # make depend;make # mv /netbsd /netbsd.old # cp netbsd / # reboot * Binary Patch: Binary patches are being provided, in the form of replacement kernels built with the patches from the GENERIC kernel configuration. If you use a custom kernel configuration, these may not be suitable for you. netbsd-current: Releng does not compile -current kernels during a release cycle. Users of -current are expected to be capable of upgrading from sources. netbsd-2-0: Retreive a kernel from: ftp://releng.netbsd.org/pub/NetBSD-daily/netbsd-2-0/DATE/ARCH/binary/kernel/ Where DATE is any available DATE later than 2004-04-17 Thanks To ========= Stefan Esser for detection and notification Niels Provos for patches Revision History ================ 2004-05-12 Initial release More Information ================ Advisories may be updated as new information becomes available. The most recent version of this advisory (PGP signed) can be found at ftp://ftp.NetBSD.org/pub/NetBSD/security/advisories/NetBSD-SA2004-007.txt.asc Information about NetBSD and NetBSD security can be found at http://www.NetBSD.org/ and http://www.NetBSD.org/Security/. Copyright 2004, The NetBSD Foundation, Inc. All Rights Reserved. Redistribution permitted only in full, unmodified form. $NetBSD: NetBSD-SA2004-007.txt,v 1.2 2004/05/12 15:39:10 david Exp $ - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (NetBSD) iQCVAwUBQKJFLz5Ru2/4N2IFAQEaTgQAhGSQG1/cWAjKSV95hZ5dej1tkA+eYEMO Y8EuSm80ebavAb4gJnvm5AcpnWu8THZgMdALNcJ+E7cK9wzCF8XfLHy/hHRPCcgr Q/2vtood5T/ZdDdWJ9RXPBxR6GtAGvHXdhBqHWxTdN8OmaX36N1TptQ4mI9QoeWf PTIeZpnsSBw= =RBZ+ - -----END PGP SIGNATURE----- - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. This security bulletin is provided as a service to AusCERT's members. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBQKMeFSh9+71yA2DNAQIUCAP+MGot7OkZUuHuySpSWehR7b/Kq1hizn16 SAoHH1EP4pB/xSQxfJ5vcCRqI89j4/YxJFA1xnS1VwiWriHgut+CuWlStnbXVE9g WtJ/yIncNWHSRQ6wOx7j8kHp8zYrdC9BnMkTMyY+hidIzSKL84c8Q2/4ap7quhqx cm8WtWZMP78= =+n/n -----END PGP SIGNATURE-----