-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-19:14.freebsd32 Security Advisory The FreeBSD Project Topic: Kernel memory disclosure in freebsd32_ioctl Category: core Module: kernel Announced: 2019-07-24 Credits: Ilja van Sprundel, IOActive Affects: FreeBSD 11.2 and FreeBSD 11.3 Corrected: 2019-07-22 18:14:34 UTC (stable/11, 11.2-STABLE) 2019-07-24 12:54:10 UTC (releng/11.2, 11.2-RELEASE-p12) 2019-07-24 12:54:10 UTC (releng/11.3, 11.3-RELEASE-p1) CVE Name: CVE-2019-5605 For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit . I. Background The FreeBSD kernel supports executing 32-bit applications on a 64-bit kernel, including the ioctl(2) interface. II. Problem Description Due to insufficient initialization of memory copied to userland in the components listed above small amounts of kernel memory may be disclosed to userland processes. III. Impact A user who can invoke 32-bit FreeBSD ioctls may be able to read the contents of small portions of kernel memory. Such memory might contain sensitive information, such as portions of the file cache or terminal buffers. This information might be directly useful, or it might be leveraged to obtain elevated privileges in some way; for example, a terminal buffer might include a user-entered password. IV. Workaround No workaround is available. V. Solution Upgrade your vulnerable system to a supported FreeBSD stable or release / security branch (releng) dated after the correction date. 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 # shutdown -r +10min "Security update" 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-19:14/freebsd32.patch # fetch https://security.FreeBSD.org/patches/SA-19:14/freebsd32.patch.asc # gpg --verify freebsd32.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 and reboot the system. VI. Correction details The following list contains the correction revision numbers for each affected branch. Branch/path Revision - ------------------------------------------------------------------------- stable/11/ r350217 releng/11.2/ r350283 releng/11.3/ r350283 - ------------------------------------------------------------------------- Note: This issue was addressed in a different way prior to the branch point for stable/12. As such, no patch is needed for FreeBSD 12.x. 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: VII. References The latest revision of this advisory is available at -----BEGIN PGP SIGNATURE----- iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl04WmNfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cIavw//emdRXVNpGREW1FfUvWmUPpdgk6rFck9nEG0KUKYCcfhqN83BN9XtqaWu lBQ1jbB/CsalwL6Gpn2yuMvgS8W4yUidyPHLpzuoAThlsy5bHID1/oRftJt0T0BS kHbTD0tTUt3QDV51FoLBjvXfjRRb8xJ+wIGJ0NzOscWgjgu6JPUysHEJD3+vSOKN X3qJd3zcoYqswcvuhoVE2cFrSaZKEyIi1pJVr9CGItQTWXIisgdXdGYTnBdZU8jq iJGaI1BXiNUl/p/21JA32T+ZD7cdMtx6KiuoKlY7Bzgj7Qk3XW7xsQsYu724LIJT pVhIxntMrQSak7wIaqNPGR/FgkkKDsoo6iCHXlGxXv6tLg7pnioZIaHhc5+UZqmT 8I0UogWhQZS03/nwFRVDLPp+ka2P0g2gsm/dX1UVuucMT+hGeqn2c/iaSU76duoR qavRPjLPJDnfVrpXhpqco9rq1+UwA/1uSNe0cFX0ArX040hCReDsMphcxgrkZ0sD u71Px2ZLE5rpWmFd8LD0X2y1l4OEcTmoTPUtJxHlVrMFztuNbAlRnyCxTV8c2uId zN44wRj6c2ZEV/w+kBVTV+L7NSt1eHDZ5tgUL7boEOylEgkHTl30aZ8nV2wvpaM3 1Y/IwBnGmI4iNLMnRoIDlac6rR3dMUS4gtH+lkfxlBri9Qc3Qso= =8LlB -----END PGP SIGNATURE-----