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  • [FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-21:14.ggatec

    From FreeBSD Security Advisories@21:1/5 to All on Fri Sep 17 15:45:18 2021
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    ============================================================================= FreeBSD-SA-21:14.ggatec Security Advisory
    The FreeBSD Project

    Topic: Remote code execution in ggatec(8)

    Category: core
    Module: ggatec
    Announced: 2021-08-24
    Credits: Johannes Totz
    Affects: All supported versions of FreeBSD.
    Corrected: 2021-08-24 17:50:50 UTC (stable/13, 13.0-STABLE)
    2021-08-24 17:37:45 UTC (releng/13.0, 13.0-RELEASE-p4)
    2021-08-24 18:30:13 UTC (stable/12, 12.2-STABLE)
    2021-08-24 18:32:15 UTC (releng/12.2, 12.2-RELEASE-p10)
    2021-08-24 18:29:35 UTC (stable/11, 11.4-STABLE)
    2021-08-24 18:31:29 UTC (releng/11.4, 11.4-RELEASE-p13)
    CVE Name: CVE-2021-29630

    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

    GEOM Gate is a GEOM module that reflects I/O requests into user mode where
    the ggatec(8) daemon fowards those requests to ggated(8), possibly over the network to another machine.

    II. Problem Description

    The ggatec(8) daemon does not validate the size of a response before writing
    it to a fixed-sized buffer. This allows to overwrite the stack of ggatec(8).

    III. Impact

    A malicious ggated(8) or an attacker in a priviledged network position can overwrite the stack with crafted content and potentially execute arbitrary code.

    IV. Workaround

    No workaround is available but systems not using ggatec(8) are not affected. Neither ggatec(8) nor ggated(8) are enabled by default and need explicit configuration by the super-user.

    V. Solution

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

    Restart any ggatec(8) instances. Existing ggate devices can be kept alive
    and restarted with `ggatec rescue`.

    Perform one of the following:

    1) To update your vulnerable system via a binary patch:

    Systems running a RELEASE version of FreeBSD on the amd64, i386, or
    (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility:

    # freebsd-update fetch
    # freebsd-update install

    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-21:14/ggatec.patch
    # fetch https://security.FreeBSD.org/patches/SA-21:14/ggatec.patch.asc
    # gpg --verify ggatec.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 the applicable daemons, or reboot the system.

    VI. Correction details

    This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches:

    Branch/path Hash Revision
    - ------------------------------------------------------------------------- stable/13/ 0729ba2f49c9 stable/13-n246938 releng/13.0/ c8a2cc4ba845 releng/13.0-n244757 stable/12/ r370383 releng/12.2/ r370394 stable/11/ r370381 releng/11.4/ r370387
    - -------------------------------------------------------------------------

    For FreeBSD 13 and later:

    Run the following command to see which files were modified by a
    particular commit:

    # git show --stat <commit hash>

    Or visit the following URL, replacing NNNNNN with the hash:

    <URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>

    To determine the commit count in a working tree (for comparison against
    nNNNNNN in the table above), run:

    # git rev-list --count --first-parent HEAD

    For FreeBSD 12 and earlier:

    Run the following command to see which files were modified by a particular revision, replacing NNNNNN with the revision number:

    # 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-2021-29630>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-21:14.ggatec.asc> -----BEGIN PGP SIGNATURE-----

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