-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

=============================================================================
FreeBSD-SA-14:26.ftp                                        Security Advisory
                                                          The FreeBSD Project

Topic:          Remote command execution in ftp(1)

Category:       core
Module:         ftp
Announced:      2014-11-04
Credits:        Jared McNeill, Alistair Crooks
Affects:        All supported versions of FreeBSD.
Corrected:      2014-11-04 23:29:57 UTC (stable/10, 10.1-PRERELEASE)
                2014-11-04 23:34:46 UTC (releng/10.1, 10.1-RC4-p1)
                2014-11-04 23:34:46 UTC (releng/10.1, 10.1-RC3-p1)
                2014-11-04 23:34:46 UTC (releng/10.1, 10.1-RC2-p3)
                2014-11-04 23:31:17 UTC (releng/10.0, 10.0-RELEASE-p12)
                2014-11-04 23:30:47 UTC (stable/9, 9.3-STABLE)
                2014-11-04 23:33:46 UTC (releng/9.3, 9.3-RELEASE-p5)
                2014-11-04 23:33:17 UTC (releng/9.2, 9.2-RELEASE-p15)
                2014-11-04 23:32:45 UTC (releng/9.1, 9.1-RELEASE-p22)
                2014-11-04 23:30:23 UTC (stable/8, 8.4-STABLE)
                2014-11-04 23:32:15 UTC (releng/8.4, 8.4-RELEASE-p19)
CVE Name:       CVE-2014-8517

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 ftp(1) userland utility is an interactive FTP client.  It can also
be used non-interactively, by providing a URL on the command line.  In
this mode, it supports HTTP in addition to FTP.

II.  Problem Description

A malicious HTTP server could cause ftp(1) to execute arbitrary
commands.

III. Impact

When operating on HTTP URIs, the ftp(1) client follows HTTP redirects,
and uses the part of the path after the last '/' from the last
resource it accesses as the output filename if '-o' is not specified.

If the output file name provided by the server begins with a pipe
('|'), the output is passed to popen(3), which might be used to
execute arbitrary commands on the ftp(1) client machine.

IV.  Workaround

No workaround is available.  Users are encouraged to replace ftp(1) in
non-interactive use by either fetch(1) or a third-party client such as
curl or wget.

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.

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

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 8]
# fetch https://security.FreeBSD.org/patches/SA-14:26/ftp-8.patch
# fetch https://security.FreeBSD.org/patches/SA-14:26/ftp-8.patch.asc
# gpg --verify ftp-8.patch.asc

[All other versions]
# fetch https://security.FreeBSD.org/patches/SA-14:26/ftp.patch
# fetch https://security.FreeBSD.org/patches/SA-14:26/ftp.patch.asc
# gpg --verify ftp.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile ftp.  Execute the following commands as root:

# cd /usr/src/usr.bin/ftp
# make && make install

VI.  Correction details

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

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/8/                                                         r274108
releng/8.4/                                                       r274111
stable/9/                                                         r274109
releng/9.1/                                                       r274112
releng/9.2/                                                       r274113
releng/9.3/                                                       r274114
stable/10/                                                        r274107
releng/10.0/                                                      r274110
releng/10.1/                                                      r274115
- -------------------------------------------------------------------------

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-2014-8517>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-14:26.ftpd.asc>
-----BEGIN PGP SIGNATURE-----
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=QT3h
-----END PGP SIGNATURE-----