1. Forum
  2. Usenet
  3. COMP.UNIX.BSD.FREEBSD.ANN

  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-20:16.cryptodev

    From FreeBSD Security Advisories@21:1/5 to All on Tue May 12 20:00:03 2020
    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA512

    ============================================================================= FreeBSD-SA-20:16.cryptodev Security Advisory
    The FreeBSD Project

    Topic: Insufficient cryptodev MAC key length check

    Category: core
    Module: cryptodev
    Announced: 2020-05-12
    Credits: Yuval Kanarenstein
    Affects: FreeBSD 12.1
    Corrected: 2020-01-20 11:54:00 UTC (stable/12, 12.1-STABLE)
    2020-05-12 16:59:09 UTC (releng/12.1, 12.1-RELEASE-p5)
    CVE Name: CVE-2019-15880

    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 cryptodev module permits userland applications to offload cryptographic requests to device drivers in the kernel. Applications create sessions via file descriptors opened from /dev/crypto.

    II. Problem Description

    Requests to create cryptography sessions using a MAC did not validate the user-supplied MAC key length. The cryptodev module allocates a buffer whose size is this user-suppled length.

    III. Impact

    An unprivileged process can trigger a kernel panic.

    IV. Workaround

    Unload the cryptodev kernel module if it is loaded:

    # kldunload cryptodev

    Note that the cryptodev module is not loaded by default and is not
    used by most applications. Specificially, use of accelerated software cryptography (e.g. AES-NI) in userland applications via libraries such
    as OpenSSL does not make use of the cryptodev module.

    V. Solution

    Upgrade your vulnerable system to a supported FreeBSD stable or
    release / security branch (releng) dated after the correction date, and
    reboot the system.

    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 "Rebooting for a 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-20:16/cryptodev.patch
    # fetch https://security.FreeBSD.org/patches/SA-20:16/cryptodev.patch.asc
    # gpg --verify cryptodev.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/12/ r356911 releng/12.1/ r360977
    - -------------------------------------------------------------------------

    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-2019-15880>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:16.cryptodev.asc> -----BEGIN PGP SIGNATURE-----

    iQKTBAEBCgB9FiEE/A6HiuWv54gCjWNV05eS9J6n5cIFAl663tdfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEZD MEU4NzhBRTVBRkU3ODgwMjhENjM1NUQzOTc5MkY0OUVBN0U1QzIACgkQ05eS9J6n 5cKFbg/+Ou239S9yDp+FTyDlqq4w8p08kh8nHqB6FO6Q6aIxkEgSu/yO9IZsKSnM o05O8iOVOTRR5xSIBN/aW5d4adH81AV6X66NKUZ0bJwAp16v7YIyivY3ySLOB093 oOTy/wlv0jxAYVzOlqMTuVm4dr9dh+9I9kwF94SDY7/maY0pCuUmVCRi2Y5gvCqu LYkDdG0Mq0pka1sGY8aFvG63oMyZ98gkbBNk666SzJnBDq/QDSL0FASCgYDjG1fE R/BciJpucIFi3JPZgSaKi4j56HiN/LaX63A1rdjza3aRh/sLMr7+GHFI3sn474tu xrkRjwnxr7/dghjspHAvsv+8U1oRIGVxeyaQB+Hd4WvNcVzp2McNBJ9c/z7Ugt1r affyXl0JBBkdVa45xDf/weGwwxcmCWxXxv7gDPelf07p3MNjl5G3pPUCUoRA3XE5 Am1v5E0Eui5s/H4ncodY/ECIAHuOfenzdcpK5xCQUMHkgikfiLftNfLWSVOrqEJn Wxl8/ttKWLYYwYDSYrN0kNvQWc6LHsuA1I7Zt7wpRW09wB2OlZ7Hn2nZebTrXjKG P/AeGa+JVCJ2HZzj1+8qxcFHgq8IRINICvq743e2vIQak0KsgqmtvnLavAlv/p3d zPxFJOPAw0bhJj14qLT+cXGC9u3/qrZWWR0b4S7qeMlLG3Cw4fk=
    =j3X1
    -----END PGP SIGNATURE-----
    _______________________________________________
    freebsd-announce@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-announce
    To unsubscribe, send any mail to "freebsd-announce-unsubscribe@freebsd.org"

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)