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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.2789 Bhyve out-of-bounds read in XHCI device 26 July 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: bhyve Publisher: FreeBSD Operating System: FreeBSD Impact/Access: Denial of Service -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-5604 Original Bulletin: https://security.freebsd.org/advisories/FreeBSD-SA-19:16.bhyve.asc - --------------------------BEGIN INCLUDED TEXT-------------------- - -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:16.bhyve Security Advisory The FreeBSD Project Topic: Bhyve out-of-bounds read in XHCI device Category: core Module: bhyve Announced: 2019-07-24 Credits: Reno Robert Affects: All supported versions of FreeBSD. Corrected: 2019-07-23 17:48:37 UTC (stable/12, 12.0-STABLE) 2019-07-24 12:56:06 UTC (releng/12.0, 12.0-RELEASE-p8) 2019-07-23 17:48:37 UTC (stable/11, 11.2-STABLE) 2019-07-24 12:56:06 UTC (releng/11.2, 11.2-RELEASE-p12) 2019-07-24 12:56:06 UTC (releng/11.3, 11.3-RELEASE-p1) CVE Name: CVE-2019-5604 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 bhyve(8) is a hypervisor that supports running a variety of virtual machines (guests). bhyve includes an emulated XHCI device. II. Problem Description The pci_xhci_device_doorbell() function does not validate the 'epid' and 'streamid' provided by the guest, leading to an out-of-bounds read. III. Impact A misbehaving bhyve guest could crash the system or access memory that it should not be able to. IV. Workaround No workaround is available, however systems not using bhyve(8) for virtualization are not vulnerable. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. No reboot is required. Rather the bhyve(8) process for vulnerable virtual machines should be restarted. Perform one of the following: 1) 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 Restart any bhyve virtual machines or reboot the system. 2) 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-19:16/bhyve.patch # fetch https://security.FreeBSD.org/patches/SA-19:16/bhyve.patch.asc # gpg --verify bhyve.patch.asc b) Apply the patch. Execute the following commands as root: # cd /usr/src # patch < /path/to/patch c) Recompile the operating system using buildworld and installworld as described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>. Restart any bhyve virtual machines, or reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - - ------------------------------------------------------------------------- stable/12/ r350246 releng/12.0/ r350285 stable/11/ r350247 releng/11.2/ r350285 releng/11.3/ r350285 - - ------------------------------------------------------------------------- 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-2019-5604> The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:16.bhyve.asc> - -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl04WmtfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cI+Jw//TcrKrFaXkEJtqzspjoeK9YKwNwj30ewdb/Ph3GdcgVoQmfJVsWPcmcM9 +dewKdl7gGLhVhoJ+3f3oFzlDcqSxFLHcNwSW5J7P8Zt+7ZpQzwH8pfB6S8T1Nk6 77Sv5hYrjy8kdSh6Z/c8BkAQrhEFYO09xej8ekQ1B+iL2N4ErexpCNTMKlP96pGS 0/4tso5gdcwrc1t6HHGffFkjItgnE8Lvgr1ZsSHbcRGAc3nqy3n21U+VH+fecAzK 0NBO3HQeCbRIEdAms3jMLcAJGrs60VBN0nnWqLxlGBb10hY7Si0NkgbWOP2g/Elf J+K4SHTFXbhIGrpsrEdvSVPvytQ8gKOSys5luvtLjt0Yhll08eEUDVzaIk//Hsak BcUSlKHULLkVTJZvdZAHUMHJOMPpSAh61DuFcM+pxAt5E9rmgX+HnPBs1yLbgd23 NaQadFC126T+AW5W5GyOs2BIEo4bdTNHqONF7gmR4a5bv6/7GWZz/QNsep43jDZH 43lur9mts+/1LUCD1s4DkMniNMaGt28GMNa44PgQVzHI7NU/gdVe25TLnAv+X9lO aAkV/WAyszux/Io2G2DfJNTc8Am/xRzFBvmydOnbMtzw8X/xgxB1/0ysl51O9Bdw OhfpMygAsxbG0e8y5VuhpuoHd8/vIoBmA0z+u1tt4zxJIXgqSgE= =/161 - -----END PGP SIGNATURE----- - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXTo+d2aOgq3Tt24GAQhYqBAAwE1BrEah/DPMJmXgJlc79Pk8nxkCDJG8 Us9CHBdehivoWA9cliuh5Nm2PCyMRDXPW7LIPr6N4A8yqXKLvAOKhmUTTXqgafqC SpZsmifsHxImEk5AhFkZM7ulUjtj03TPR7qZ9YInIivJ+8PIgMeJTFBBa1BWTHEA 3CUS9tDveZulHCtQxSBkR5iOX7Abtqbs3ScRUVQPaR/0ej4k19Gm+ZzZy7UAUKAa dvQk/JDsMeF95/xDqxiXJsn2XHB4mu2aCM6hRtDuD01xef3SkurPQfdK5hGkKz+A F2RHu4TOfSOKkQWfXewNs8+1S66nL30cTfKXoyMnTRMpzcirPXQGQWyyL6+lwsMJ hTiQXBrouZzXo6j9SmB6+HSpXdGQodss0aF7uZ5SFuFuQ904E4eBsBA4qhPSyrSt Oe9g9QbkauYLHEIn5CcIooEXKG6Pj+ITIRhDT1ZcS79kNf517delPcwsCa/+QTzM dh6gxa0GkPcdmgeU4Wm/evLJz4t3CdaYTAZaGhM8wIeUeJBBPJQeOnUhF3LWcxzM u/w9dhXxj9RqtTTAoOfwOyppRmrRBLzsRz6YoNXp51MZ9a0Pn1KleYMlfP4tJmVN s0p6CZ3imVp7Got3fL1jM2AOqOdoWWDvx0dqydq1t7k6uQb0dMmGJxZYMnA0zTnR WuKieFw2Mb0= =5LZn -----END PGP SIGNATURE-----