(FreeBSD Issues Fix) WU-FTPD File Globbing Character Bug Allows Remote Users to Obtain Root-Level Privileges on the Server
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SecurityTracker Alert ID: 1002898 |
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SecurityTracker URL: http://securitytracker.com/id/1002898
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Dec 4 2001
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Impact:
Execution of arbitrary code via network, Root access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): 2.6.1-18 and prior
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Description:
Red Hat reported a vulnerability in the WU-FTPD FTP server. An error in expanding (globbing) file names may allow remote users to execute arbitrary code on the FTP server.
It is reported that a remote user with access to an FTP server account (including anonymous access) can specify a "file globbing" pattern where the server will attempt to find matching files based on the pattern. If a malformed globbing pattern is used, the remote user can trigger the vulnerability and cause the process to overwrite memory that was not properly allocated, creating a heap overwrite condition. This may allow the remote user to execute arbitrary code on the server with the privileges of the FTP server (which is typically root level privileges).
If the globbing pattern is '~{', the error can be triggered.
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Impact:
A remote user with access to the FTP server, including anonymous access, can execute arbitrary code on the server with the permissions of the FTP server (which is typically root level privileges).
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Solution:
The vendor has released a fix and recommends one of the following steps:
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:
[i386]
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/ftp/wu-ftpd-2.6.1_7.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/ftp/wu-ftpd-2.6.1_7.tgz
[alpha]
Packages are not automatically generated for the alpha architecture at this time due to lack of build resources
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/i386/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
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Vendor URL: www.wu-ftpd.org/ (Links to External Site)
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Cause:
Boundary error, Exception handling error
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Underlying OS:
UNIX (FreeBSD)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Tue, 4 Dec 2001 10:54:18 -0800 (PST)
Subject: FreeBSD Ports Security Advisory FreeBSD-SA-01:64.wu-ftpd
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-----BEGIN PGP SIGNED MESSAGE-----
=============================================================================
FreeBSD-SA-01:64 Security Advisory
FreeBSD, Inc.
Topic: wu-ftpd port contains remote root compromise
Category: ports
Module: wu-ftpd
Announced: 2001-12-04
Credits: CORE Security Technologies
Contact: Ivan Arce (iarce@corest.com)
Affects: Ports collection prior to the correction date
Corrected: 2001-11-28 10:52:26 UTC
FreeBSD only: NO
I. Background
wu-ftpd is a popular full-featured FTP server.
II. Problem Description
The wu-ftpd port, versions prior to wu-ftpd-2.6.1_7, contains a
vulnerability which allows FTP users, both anonymous FTP users and
those with valid accounts, to execute arbitrary code as root on
the local machine. This may be accomplished by inserting invalid
globbing parameters which are incorrectly parsed by the FTP server
into command input.
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 6000 third-party applications in a ready-to-install
format. The ports collection shipped with FreeBSD 4.4 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
FTP users, including 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 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:
[i386]
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-4-stable/ftp/wu-ftpd-2.6.1_7.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/ftp/wu-ftpd-2.6.1_7.tgz
[alpha]
Packages are not automatically generated for the alpha architecture at
this time due to lack of build resources
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/i386/packages-4-stable/devel/portcheckout-2.0.tgz
ftp://ftp.FreeBSD.org/pub/FreeBSD/ports/i386/packages-5-current/devel/portcheckout-2.0.tgz
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in the FreeBSD ports collection.
Path Revision
- -------------------------------------------------------------------------
ports/ftp/wu-ftpd/Makefile 1.41
ports/ftp/wu-ftpd/files/patch-ap 1.2
- -------------------------------------------------------------------------
VII. References
<URL:http://www.securityfocus.com/archive/1/242750>
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