-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
=============================================================================
FreeBSD-SA-15:14.bsdpatch Security Advisory
The FreeBSD Project
Topic: shell injection vulnerability in patch(1)
Category: contrib
Module: patch
Announced: 2015-07-28
Credits: Martin Natano
Affects: FreeBSD 10.x.
Corrected: 2015-07-28 19:58:44 UTC (stable/10, 10.2-PRERELEASE)
2015-07-28 19:58:44 UTC (stable/10, 10.2-BETA2-p2)
2015-07-28 19:59:04 UTC (releng/10.2, 10.2-RC1-p1)
2015-07-28 19:59:11 UTC (releng/10.1, 10.1-RELEASE-p16)
CVE Name: CVE-2015-1416
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 patch(1) utility takes a patch file produced by the diff(1) program and
apply the differences to an original file, producing a patched version.
The patch(1) utility supports certain version control systems, namely SCCS
and RCS, and attempts to get or check out the file before applying a patch,
if the original file do not already exist.
II. Problem Description
Due to insufficient sanitization of the input patch stream, it is possible
for a patch file to cause patch(1) to run commands in addition to the desired
SCCS or RCS commands.
III. Impact
This issue could be exploited to execute arbitrary commands as the user
invoking patch(1) against a specically crafted patch file, which could be
leveraged to obtain elevated privileges.
IV. Workaround
No workaround is available, but systems where a privileged user does not
make use of patches without proper validation are not affected.
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.
A reboot is not required after updating.
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
A reboot is not required after updating.
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 https://security.FreeBSD.org/patches/SA-15:14/bsdpatch.patch
# fetch https://security.FreeBSD.org/patches/SA-15:14/bsdpatch.patch.asc
# gpg --verify bsdpatch.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/10/ r285976
releng/10.1/ r285978
releng/10.2/ r285979
- -------------------------------------------------------------------------
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-2015-1416>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-15:14.bsdpatch.asc>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.1.6 (FreeBSD)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=JTtx
-----END PGP SIGNATURE-----
