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=============================================================================
FreeBSD-EN-15:15.pkg                                            Errata Notice
                                                          The FreeBSD Project

Topic:          Insufficient check of unsupported pkg(7) signature methods

Category:       core
Module:         pkg
Announced:      2015-08-25
Credits:        Fabian Keil
Affects:        All supported versions of FreeBSD.
Corrected:      2015-08-19 18:32:36 UTC (stable/10, 10.2-STABLE)
                2015-08-25 20:48:51 UTC (releng/10.2, 10.2-RC3-p2)
                2015-08-25 20:48:51 UTC (releng/10.2, 10.2-RELEASE-p2)
                2015-08-25 20:48:58 UTC (releng/10.1, 10.1-RELEASE-p19)
                2015-08-19 18:33:25 UTC (stable/9, 9.3-STABLE)
                2015-08-25 20:49:05 UTC (releng/9.3, 9.3-RELEASE-p24)
CVE Name:       CVE-2015-5676

For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.freebsd.org/>.

I.   Background

The pkg(8) utility is the package management tool for FreeBSD.  The base
system includes a pkg(7) bootstrap utility used to install the latest pkg(8)
utility.

II.  Problem Description

When signature_type specified in pkg.conf(5) is set to an unsupported method,
the pkg(7) bootstrap utility would behave as if signature_type is set to
"none".

III. Impact

MITM attackers may be able to use this vulnerability and bypass validation,
installing their own version of pkg(8).

IV.  Workaround

No workaround is available, but the default FreeBSD configuration is not
affected because it uses "fingerprint" method.

V.   Solution

Perform one of the following:

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

2) To update your present 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

3) To update your present 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/EN-15:15/pkg.patch
# fetch https://security.FreeBSD.org/patches/EN-15:15/pkg.patch.asc
# gpg --verify pkg.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>.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/9/                                                         r286936
releng/9.3/                                                       r287147
stable/10/                                                        r286935
releng/10.1/                                                      r287146
releng/10.2/                                                      r287145
- -------------------------------------------------------------------------

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-2015-5676>

The latest revision of this Errata Notice is available at
https://security.FreeBSD.org/advisories/FreeBSD-EN-15:15.pkg.asc

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