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  • FreeBSD Security Advisory FreeBSD-SA-23:12.msdosfs

    From FreeBSD Security Advisories@21:1/5 to All on Wed Oct 4 00:00:12 2023
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    ============================================================================= FreeBSD-SA-23:12.msdosfs Security Advisory
    The FreeBSD Project

    Topic: msdosfs data disclosure

    Category: core
    Module: msdosfs (FAT) file system driver
    Announced: 2023-10-03
    Credits: Maxim Suhanov
    Affects: All supported versions of FreeBSD.
    Corrected: 2023-07-18 05:46:13 UTC (stable/13, 13.2-STABLE)
    2023-10-03 21:23:40 UTC (releng/13.2, 13.2-RELEASE-p4)
    2023-09-11 18:51:21 UTC (stable/12, 12.4-STABLE)
    2023-10-03 22:15:40 UTC (releng/12.4, 12.4-RELEASE-p6)
    CVE Name: CVE-2023-5368

    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 msdosfs driver provides read and write access to MS-DOS (FAT) file
    systems. Systems may be configured to allow unprivileged users to have
    read and write access to mounted msdosfs file systems.

    II. Problem Description

    In certain cases using the truncate or ftruncate system call to extend a
    file size populates the additional space in the file with unallocated data
    from the underlying disk device, rather than zero bytes.

    III. Impact

    A user with write access to files on a msdosfs file system may be able to
    read unintended data (for example, from a previously deleted file).

    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,
    and reboot.

    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
    # 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.

    [FreeBSD 13.2]
    # fetch https://security.FreeBSD.org/patches/SA-23:12/msdosfs.13.2.patch
    # fetch https://security.FreeBSD.org/patches/SA-23:12/msdosfs.13.2.patch.asc
    # gpg --verify msdosfs.13.2.patch.asc

    [FreeBSD 12.4]
    # fetch https://security.FreeBSD.org/patches/SA-23:12/msdosfs.12.4.patch
    # fetch https://security.FreeBSD.org/patches/SA-23:12/msdosfs.12.4.patch.asc
    # gpg --verify msdosfs.12.4.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

    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/ 868f3eadc5e0 stable/13-n255824 releng/13.2/ 7d08a7e6908b releng/13.2-n254635 stable/12/ r373207 releng/12.4/ r373233
    - -------------------------------------------------------------------------

    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-2023-5368>

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-23:12.msdosfs.asc> -----BEGIN PGP SIGNATURE-----

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