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FreeBSD-SA-20:05.if_oce_ioctl Security Advisory
The FreeBSD Project

Topic: Insufficient oce(4) ioctl(2) privilege checking

Category: core
Module: oce(4)
Announced: 2020-03-19
Credits: Ilja Van Sprundel
Affects: All supported versions of FreeBSD.
Corrected: 2019-12-26 16:56:42 UTC (stable/12, 12.1-STABLE)
2020-03-19 16:48:29 UTC (releng/12.1, 12.1-RELEASE-p3)
2019-12-26 16:58:11 UTC (stable/11, 11.3-STABLE)
2020-03-19 16:48:29 UTC (releng/11.3, 11.3-RELEASE-p7)
CVE Name: CVE-2019-15876

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 primary interface used for network driver configuration is ioctl(2).
Several ioctl(2) commands are reserved for driver-specific purposes. For
instance, a driver may use one of these ioctls to implement an interface for
updating device firmware.

II. Problem Description

The driver-specific ioctl(2) command handlers in oce(4) failed to check
whether the caller has sufficient privileges to perform the corresponding
operation.

III. Impact

The oce(4) handler permits unprivileged users to send passthrough commands to
device firmware.

IV. Workaround

No workaround is available. Systems that do not contain devices driven by
oce(4) are unaffected.

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 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-20:05/if_oce_ioctl.patch
# fetch https://security.FreeBSD.org/patches/SA-20:05/if_oce_ioctl.patch.asc
# gpg –verify if_oce_ioctl.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/ r356089
releng/12.1/ r359139
stable/11/ r356090
releng/11.3/ r359139
– ————————————————————————-

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-2019-15876>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-20:05.if_oce_ioctl.asc>
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