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===========================================================================
	      AUSCERT External Security Bulletin Redistribution

                  ESB-2000.163 -- FreeBSD-SA-00:29.wu-ftpd
                wu-ftpd port contains remote root compromise
                                 7 July 2000

===========================================================================

	AusCERT Security Bulletin Summary
	---------------------------------

Product:		wu-ftpd
Vendor:			FreeBSD Ports Collection
Operating System:	FreeBSD
			Linux
                        Unix
Platform:               N/A

Impact:                 Root Compromise
Access Required:        Remote

Ref:			AA-2000.02
			AL-2000.09	

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FreeBSD-SA-00:29                                           Security Advisory
                                                                FreeBSD, Inc.

Topic:          wu-ftpd port contains remote root compromise

Category:       ports
Module:         wu-ftpd
Announced:      2000-07-05
Credits:        tf8 <tf8@ZOLO.FREELSD.NET>
Affects:        Ports collection.
Corrected:      2000-06-24
Vendor status:  Contacted
FreeBSD only:   NO

I.   Background

wu-ftpd is a popular FTP server.

II.  Problem Description

The wu-ftpd port, versions 2.6.0 and below, contains a vulnerability
which allows remote anonymous FTP users to execute arbitrary code as
root on the local machine, by inserting string-formatting operators
into command input, which are incorrectly parsed by the FTP server.

The wu-ftpd port is not installed by default, nor is it "part of
FreeBSD" as such: it is part of the FreeBSD ports collection, which
contains over 3400 third-party applications in a ready-to-install
format. The ports collections shipped with FreeBSD 3.5 and 4.0 contains
this problem since it was discovered after the release.

FreeBSD makes no claim about the security of these third-party
applications, although an effort is underway to provide a security
audit of the most security-critical ports.

III. Impact

Remote anonymous FTP users can cause arbitrary commands to be executed
as root on the local machine.

If you have not chosen to install the wu-ftpd port/package, then
your system is not vulnerable to this problem.

IV.  Workaround

Deinstall the wu-ftpd port/package, if you you have installed it.

V.   Solution

One of the following:

1) Upgrade your entire ports collection and rebuild the wu-ftpd port.

2) Deinstall the old package and install a new package dated after the
correction date, obtained from:

ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-3-stable/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-4-stable/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/ftp/wu-ftpd-2.6.0.tar.gz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/alpha/packages-5-current/ftp/wu-ftpd-2.6.0.tar.gz

NOTE: It may be several days before updated packages are available. Be
sure to check the file creation date on the package, because the
version number of the software has not changed.

3) download a new port skeleton for the wu-ftpd port from:

http://www.freebsd.org/ports/

and use it to rebuild the port.

4) Use the portcheckout utility to automate option (3) above. The
portcheckout port is available in /usr/ports/devel/portcheckout or the
package can be obtained from:

ftp://ftp.freebsd.org/pub/FreeBSD/ports/packages/devel/portcheckout-1.0.tgz

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