Bugtraq: FreeBSD Security Advisory FreeBSD-SA-16:22.libarchive

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FreeBSD-SA-16:22.libarchive Security Advisory

The FreeBSD Project

Topic: Directory traversal in cpio(1)

Category: contrib

Module: libarchive

Announced: 2016-05-31

Credits: Alexander Cherepanov

Affects: All supported versions of FreeBSD

Corrected: 2016-05-21 09:03:45 UTC (stable/10, 10.3-STABLE)

2016-05-31 16:35:03 UTC (releng/10.3, 10.3-RELEASE-p4)

2016-05-31 16:33:56 UTC (releng/10.2, 10.2-RELEASE-p18)

2016-05-31 16:32:42 UTC (releng/10.1, 10.1-RELEASE-p35)

2016-05-21 09:27:30 UTC (stable/9, 9.3-STABLE)

2016-05-31 16:23:56 UTC (releng/9.3, 9.3-RELEASE-p43)

CVE Name: CVE-2015-2304

For general information regarding FreeBSD Security Advisories,

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

following sections, please visit <URL:http://ift.tt/1W1G8vo;.

I. Background

The libarchive(3) library provides a flexible interface for reading and

writing streaming archive files such as tar(1) and cpio(1), and has been the

basis for the FreeBSD implementation of the tar(1) and cpio(1) utilities

since FreeBSD 5.3.

II. Problem Description

The cpio(1) tool from the libarchive(3) bundle is vulnerable to a directory

traversal problem via absolute paths in an archive file.

III. Impact

A malicious archive file being unpacked can overwrite an arbitrary file on

a filesystem, if the owner of the cpio process has write access to it.

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 not 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 not 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.

[FreeBSD 10.x]

# fetch http://ift.tt/1O2JWd8

# fetch http://ift.tt/1r1kQQR

# gpg --verify libarchive-10.patch.asc

[FreeBSD 9.3]

# fetch http://ift.tt/1O2K7oW

# fetch http://ift.tt/1r1kWry

# gpg --verify libarchive-9.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:http://ift.tt/1Us7cAG;.

VI. Correction details

The following list contains the correction revision numbers for each

affected branch.

Branch/path Revision

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

-

stable/9/ r300363

releng/9.3/ r301044

stable/10/ r300361

releng/10.1/ r301046

releng/10.2/ r301047

releng/10.3/ r301048

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

-

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:http://ift.tt/1Tj8sDF;

VII. References

<URL:http://ift.tt/1r1kHwF;

The latest revision of this advisory is available at

<URL:http://ift.tt/1O2K0tB

.asc>

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