FreeBSD Security Advisory FreeBSD-SA-14:26.ftp

2014-11-10T00:00:00
ID SECURITYVULNS:DOC:31363
Type securityvulns
Reporter Securityvulns
Modified 2014-11-10T00:00:00

Description

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============================================================================= 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:http://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 http://security.FreeBSD.org/patches/SA-14:26/ftp-8.patch

fetch http://security.FreeBSD.org/patches/SA-14:26/ftp-8.patch.asc

gpg --verify ftp-8.patch.asc

[All other versions]

fetch http://security.FreeBSD.org/patches/SA-14:26/ftp.patch

fetch http://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:http://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-8517>

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

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