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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2914 Information leak in kldstat(2) 16 November 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: kldstat Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Access Privileged Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-1088 Original Bulletin: https://security.freebsd.org/advisories/FreeBSD-SA-17:10.kldstat.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-17:10.kldstat Security Advisory The FreeBSD Project Topic: Information leak in kldstat(2) Category: core Module: kernel Announced: 2017-11-15 Credits: TJ Corley Affects: All supported versions of FreeBSD. Corrected: 2017-11-15 22:34:15 UTC (stable/11, 11.1-STABLE) 2017-11-15 22:49:47 UTC (releng/11.1, 11.1-RELEASE-p4) 2017-11-15 22:50:20 UTC (releng/11.0, 11.0-RELEASE-p15) 2017-11-15 22:35:16 UTC (stable/10, 10.4-STABLE) 2017-11-15 22:50:47 UTC (releng/10.4, 10.4-RELEASE-p3) 2017-11-15 22:51:08 UTC (releng/10.3, 10.3-RELEASE-p24) CVE Name: CVE-2017-1088 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>. I. Background The kldstat(2) syscall provides information about loaded kld files. The syscall takes a userland argument of struct kld_file_stat which is then filled with data about the kld file requested. II. Problem Description The kernel does not properly clear the memory of the kld_file_stat structure before filling the data. Since the structure filled by the kernel is allocated on the kernel stack and copied to userspace, a leak of information from the kernel stack is possible. III. Impact Some bytes from the kernel stack can be observed in userspace. IV. Workaround No workaround is available. V. Solution Perform one of the following: 1) Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. Afterward, reboot the system. 2) To update your vulnerable system via a binary patch: Systems running a RELEASE version of FreeBSD on the i386 or amd64 platforms can be updated via the freebsd-update(8) utility: # freebsd-update fetch # freebsd-update install Afterward, reboot the system. 3) To update your vulnerable system via a source code patch: The following patches have been verified to apply to the applicable FreeBSD release branches. a) Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility. # fetch https://security.FreeBSD.org/patches/SA-17:10/kldstat.patch # fetch https://security.FreeBSD.org/patches/SA-17:10/kldstat.patch.asc # gpg --verify kldstat.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/10/ r325867 releng/10.3/ r325878 releng/10.4/ r325877 stable/11/ r325866 releng/11.0/ r325876 releng/11.1/ r325875 - - ------------------------------------------------------------------------- To see which files were modified by a particular revision, run the following command, replacing NNNNNN with the revision number, on a machine with Subversion installed: # svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base Or visit the following URL, replacing NNNNNN with the revision number: <URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN> VII. References <URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1088> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-17:10.kldstat.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEEHPf/b631yp++G4yy7Wfs1l3PaucFAloMxhRfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldDFD RjdGRjZGQURGNUNBOUZCRTFCOENCMkVENjdFQ0Q2NURDRjZBRTcACgkQ7Wfs1l3P audjZhAA29uguakBjkQtnAlWceN0BOQlkp03iYQh61dFpdH98f7RQcr5cq77XKrM pkONtdEVbZNF9g6sly6n9dq5ivAuC9K1KGPtylMcPzHLTzDtV1B13vk2iwwgqkZ7 GgB+m305kcL85knaASn3PBYwKTKzGOrhZFUZuTTI4VAnbbEmIwTHnJlVHvNwFDIj je1XxdDBr4jq7SdCZH8YW9LZAMDi9b+0hg72u20ZQ66uNeadxN4i9DuWtMeHJHb7 2aZRtHhdw4imryUpHM4FnCp5zp9V87Gyv4wy7IrkOKYtbl4nWqxqVakL7T9yVmY5 Q4cGqreYq8bF2aM3LyT26VmDfMOovovHJpCRHf9fvlIMj6ajS39FKWMkEeU23ykg EiTNk090h/G3REWiPnWjbxt8VGnFGyLe3K1VQqUvS+LlQ4lc45WCJnEHcpbvXT/E TNTQ/85nE4BklV1d9wiLy26C21W92IguZam0HdRYJHgEc9Mug+62MfqDzHf0w5HP 3pu8IV5KMwEjGxzaiDMETIZU+K5fkdzPDNBhscxZ6OOab4zQ0+pZgdT1CSbXV6Ru xuOjSyBdz5vVdbq/298VJJ7hNyoP1MgnyaxPrG2ImNDKjUGqbtOgv0m3ISqtsyfs pEvyO2MxWWZqdNhtGJuQpOYyzAMxfJdmdOz1PMFFayQiBR7F0ao= =N2rs - -----END PGP SIGNATURE----- _______________________________________________ freebsd-security-notifications@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-security-notifications To unsubscribe, send any mail to "freebsd-security-notifications-unsubscribe@freebsd.org" - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== 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). 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