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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2009.0261 -- [UNIX/Linux][FreeBSD] Local privilege escalation 23 March 2009 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: ktimer Publisher: FreeBSD Operating System: FreeBSD UNIX variants (UNIX, Linux, OSX) Impact: Root Compromise Access: Existing Account CVE Names: CVE-2009-1041 Original Bulletin: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-09:06.ktimer.asc Comment: This advisory references vulnerabilities in products which run on platforms other than FreeBSD. It is recommended that administrators running ktimer check for an updated version of the software for their operating system. - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 ============================================================================= FreeBSD-SA-09:06.ktimer Security Advisory The FreeBSD Project Topic: Local privilege escalation Category: core Module: kern Announced: 2009-03-23 Affects: FreeBSD 7.x Corrected: 2009-03-23 00:00:50 UTC (RELENG_7, 7.2-PRERELEASE) 2009-03-23 00:00:50 UTC (RELENG_7_1, 7.1-RELEASE-p4) 2009-03-23 00:00:50 UTC (RELENG_7_0, 7.0-RELEASE-p11) CVE Name: CVE-2009-1041 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://security.FreeBSD.org/>. I. Background In FreeBSD 7.0, support was introduced for per-process timers as defined in the POSIX realtime extensions. This allows a process to have a limited number of timers running at once, with various actions taken when each timer reaches zero. II. Problem Description An integer which specifies which timer a process wishes to operate upon is not properly bounds-checked. III. Impact An unprivileged process can overwrite an arbitrary location in kernel memory. This could be used to change the user ID of the process (in order to "become root"), to escape from a jail, or to bypass security mechanisms in other ways. IV. Workaround No workaround is available, but systems without untrusted local users are not vulnerable. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to 7-STABLE, or to the RELENG_7_1 or RELENG_7_0 security branch dated after the correction date. 2) To patch your present system: The following patch has been verified to apply to FreeBSD 7.0 and 7.1 systems. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch http://security.FreeBSD.org/patches/SA-09:06/ktimer.patch # fetch http://security.FreeBSD.org/patches/SA-09:06/ktimer.patch.asc b) Apply the patch. # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the revision numbers of each file that was corrected in FreeBSD. CVS: Branch Revision Path - - ------------------------------------------------------------------------- RELENG_7 src/sys/kern/kern_time.c 1.142.2.3 RELENG_7_1 src/UPDATING 1.507.2.13.2.7 src/sys/conf/newvers.sh 1.72.2.9.2.8 src/sys/kern/kern_time.c 1.142.2.2.2.2 RELENG_7_0 src/UPDATING 1.507.2.3.2.15 src/sys/conf/newvers.sh 1.72.2.5.2.15 src/sys/kern/kern_time.c 1.142.4.1 - - ------------------------------------------------------------------------- Subversion: Branch/path Revision - - ------------------------------------------------------------------------- stable/7/ r190301 releng/7.1/ r190301 releng/7.0/ r190301 - - ------------------------------------------------------------------------- VII. References http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1041 The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-06:09.ktimer.asc - -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAknG0hQACgkQFdaIBMps37JA4gCfaznvIWKB/AU0cv6ojZUhheD4 MuYAnAp3wuz3E7gIX6VK7PeUVnPp/41o =MPIX - -----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. NOTE: Third Party Rights 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 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 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 iD8DBQFJxunINVH5XJJInbgRAtegAJ0dtopbjlASdYG6/IQ33fsYjipLUACcCYEl vGa3yVq/WVTKXkLX4bzUNA8= =2Aw5 -----END PGP SIGNATURE-----