Bugtraq: FreeBSD Security Advisory FreeBSD-SA-16:19.sendmsg

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FreeBSD-SA-16:19.sendmsg Security Advisory

The FreeBSD Project

Topic: Incorrect argument handling in sendmsg(2)

Category: core

Module: kernel

Announced: 2016-05-17

Credits: CTurt and the HardenedBSD team

Affects: FreeBSD 10.x

Corrected: 2016-05-17 22:30:43 UTC (stable/10, 10.3-STABLE)

2016-05-17 22:28:27 UTC (releng/10.3, 10.3-RELEASE-p3)

2016-05-17 22:28:20 UTC (releng/10.2, 10.2-RELEASE-p17)

2016-05-17 22:28:11 UTC (releng/10.1, 10.1-RELEASE-p34)

CVE Name: CVE-2016-1887

For general information regarding FreeBSD Security Advisories,

including descriptions of the fields above, security branches, and the

following sections, please visit

I. Background

The sendmsg(2) system call allows to send data to a socket. The data

may be accompanied by optional ancillary data.

II. Problem Description

Incorrect argument handling in the socket code allows malicious local

user to overwrite large portion of the kernel memory.

III. Impact

Malicious local user may crash kernel or execute arbitrary code in the kernel,

potentially gaining superuser privileges.

IV. Workaround

No workaround is available.

V. Solution

Perform one of the following:

1) Upgrade your vulnerable system to a supported FreeBSD stable or

release / security branch (releng) dated after the correction date.

Reboot is required.

2) 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

Reboot is required.

3) 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 http://ift.tt/1Tj8iMF

# fetch http://ift.tt/1W1Gcep

# gpg --verify sendmsg.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

system.

VI. Correction details

The following list contains the correction revision numbers for each

affected branch.

Branch/path Revision

- ------------------------------------------------------------------------

-

stable/10/ r300093

releng/10.1/ r300085

releng/10.2/ r300086

releng/10.3/ r300087

- ------------------------------------------------------------------------

-

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:

VII. References

The latest revision of this advisory is available at

c>

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