You are here
Home > Preporuke > Sigurnosni nedostatak jezgre operacijskog sustava

Sigurnosni nedostatak jezgre operacijskog sustava

—–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 <URL:https://security.FreeBSD.org/>.

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
<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/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:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-5605>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-19:14.freebsd32.asc>
—–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—–
_______________________________________________
freebsd-security-notifications@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/freebsd-security-notifications
To unsubscribe, send any mail to “freebsd-security-notifications-unsubscribe@freebsd.org”

Top
More in Preporuke
Sigurnosni nedostatak programskog paketa telnet

Otkriven je sigurnosni nedostatak u programskom paketu telnet za operacijski sustav FreeBSD. Otkriveni nedostatak potencijalnim napadačima omogućuje izvršavanje proizvoljnog programskog...

Close