-----BEGIN PGP SIGNED MESSAGE-----
__________________________________________________________
The U.S. Department of Energy
Computer Incident Advisory Capability
___ __ __ _ ___
/ | /_\ /
\___ __|__ / \ \___
__________________________________________________________
INFORMATION BULLETIN
Buffer Overflows in Various FTP Servers
February 16, 1999 19:00 GMT Number J-029
______________________________________________________________________________
PROBLEM: Vulnerabilities have been identified in various FTP servers.
PLATFORM: Any server running ProFTPD (1.2.Opre1) or Wuarchive ftpd
(2.4.2-academ[BETA-18]).
DAMAGE: If exploited, a buffer overflow may occur which can lead to a
root compromise.
SOLUTION: Check below to see if there are patches, updates, or workaround
from your software vendor.
______________________________________________________________________________
VULNERABILITY The risk is high since the buffer overflow condition can lead
ASSESSMENT: to root compromise.
______________________________________________________________________________
[ Start Netect, Inc. Advisory ]
Netect, Inc.
General Public Security Advisory
% Advisory: palmetto.ftpd
% Issue date: February 9, 1999
% Contact: Jordan Ritter
% Revision: February 11, 1999
% Update: Appendices A and B corrected.
[Topic]
Remote buffer overflows in various FTP servers leads to potential root
compromise.
[Affected Systems]
Any server running the latest version of ProFTPD (1.2.0pre1) or the
latest version of Wuarchive ftpd (2.4.2-academ[BETA-18]). wu-ftpd is
installed and enabled by default on most Linux variants such as RedHat
and Slackware Linux. ProFTPD is new software recently adopted by many
major internet companies for its improved performance and reliability.
Investigation of this vulnerability is ongoing; the below lists
software and operating systems for which Netect has definitive
information.
[Overview]
Software that implements FTP is called an "ftp server", "ftp daemon",
or "ftpd". On most vulnerable systems, the ftpd software is enabled
and installed by default.
There is a general class of vulnerability that exists in several
popular ftp servers. Due to insufficient bounds checking, it is
possible to subvert an ftp server by corrupting its internal stack
space. By supplying carefully designed commands to the ftp server,
intruders can force the the server to execute arbitrary commands with
root privilege.
On most vulnerable systems, the ftpd software is installed and enabled
by default.
[Impact]
Intruders who are able to exploit this vulnerability can ultimately
gain interactive access to the remote ftp server with root privilege.
[Solution]
Currently there are several ways to exploit the ftp servers in
question. One temporary workaround against an anonymous attack is to
disable any world writable directories the user may have access to by
making them read only. This will prevent an attacker from building an
unusually large path, which is required in order to execute these
particular attacks.
The permanent solution is to install a patch from your Vendor, or
locate one provided by the Software's author or maintainer. See
Appendices A and B for more specific information.
Netect strongly encourages immediate upgrade and/or patching where
available.
Netect provides a strong software solution for the automatic detection
and removal of security vulnerabilities. Current HackerShield
customers can protect themselves from this vulnerability by either
visiting the Netect website and downloading the latest RapidFire(tm)
update, or by enabling automatic RapidFire(tm) updates (no user
intervention required).
Interested in protecting your network today? Visit the Netect website
at http://www.netect.com/ and download a FREE 30 day copy of
HackerShield, complete with all the latest RapidFire(tm) updates to
safeguard your network from hackers.
[Appendix A, Software Information]
% ProFTPD
Current version: 1.2.0pre1, released October 19, 1998.
All versions prior to 1.2.0pre1: vulnerable.
Fix: will be incorporated into 1.2.0pre2.
Currently recommended action: upgrade to the new version when it
becomes available, or apply the version 1.2.0pre1 patch found at:
ftp://ftp.proftpd.org/patches/proftpd-1.2.0pre1-path_exploit2.patch
% wu-ftpd
Current version: 2.4.2 (beta 18), unknown release date.
All versions through 2.4.2 (beta 18): vulnerability dependant upon
target platform, probably vulnerable either due to OS-provided
runtime vulnerability or through use of replacement code supplied
with the source kit. No patches have been made available.
Fix: unknown.
Currently recommended action: Upgrade to wu-ftpd VR series.
% wu-ftpd VR series
Current version: 2.4.2 (beta 18) VR13, released January 28, 1999.
All versions prior to 2.4.2 (beta 18) VR10: vulnerable.
Fix: incorporated into VR10, released November 1, 1998.
Available from:
ftp://ftp.vr.net/pub/wu-ftpd/
Filenames:
wu-ftpd-2.4.2-beta-18-vr13.tar.Z
wu-ftpd-2.4.2-beta-18-vr13.tar.gz
% BeroFTPD [NOT vulnerable]
Current version: 1.3.3, released February 7, 1999.
All versions prior to 1.2.0: vulnerable.
Fix: incorporated into 1.2.0, released October 26, 1998.
Available from:
ftp://ftp.croftj.net/usr/bero/BeroFTPD/
ftp://ftp.sunet.se/pub/nir/ftp/servers/BeroFTPD/
ftp://sunsite.cnlab-switch.ch/mirror/BeroFTPD/
Filename:
BeroFTPD-1.3.3.tar.gz
% NcFTPd [NOT vulnerable]
Current version: 2.4.0, released February 6, 1999.
All versions prior to 2.3.4: unknown.
Available from:
http://www.ncftp.com/download/
Notes:
% NcFTPd 2.3.4 (libc5) ftp server has a remotely exploitable bug
that results in the loss of the server's ability to log
activity.
% This bug cannot be exploited to gain unintended or privileged
access to a system running the NcFTPd 2.3.4 (libc5) ftp
server, as tested.
% The bug was reproducible only on a libc5 Linux system. The
Linux glibc version of NcFTPd 2.3.4 ftp server is NOT
vulnerable.
% The bug does not appear to be present in version NcFTPd 2.3.5 or
later. Affected users may upgrade free of charge to the latest
version.
Thanks go to Gregory Lundberg for providing the information regarding
wu-ftpd and BeroFTPD.
[Appendix B, Vendors]
% RedHat Software, Inc.
% RedHat Version 5.2 and previous versions ARE vulnerable.
Updates will be available from:
ftp://updates.redhat.com/5.2//
Filename:
wu-ftpd-2.4.2b18-2.1..rpm
% Walnut Creek CDROM and Patrick Volkerding
% Slackware All versions ARE vulnerable.
Updates will be available from:
ftp://ftp.cdrom.com/pub/linux/slackware-3.6/slakware/n8/
ftp://ftp.cdrom.com/pub/linux/slackware-current/slakware/n8/
Filenames
tcpip1.tgz (3.6) [971a5f57bec8894364c1e0d358ffbfd4]
tcpip1.tgz (current) [e1e9a9a50ad65bab1e120a7bf60f6011]
Notes:
% The md5 checksums are current for the above mentioned Revision
date only.
% Caldera Systems, Inc.
% OpenLinux Latest version IS vulnerable
Updates will be available from:
ftp://ftp.calderasystems.com/pub/OpenLinux/updates/
% SCO
% UnixWare Version 7.0.1 and earlier (except 2.1.x) IS vulnerable.
% OpenServer Versions 5.0.5 and earlier IS vulnerable.
% CMW+ Version 3.0 is NOT vulnerable.
% Open Desktop/Server Version 3.0 is NOT vulnerable.
Binary versions of ftpd will be available shortly from the SCO ftp
site:
ftp://ftp.sco.com/SSE/sse021.ltr - cover letter
ftp://ftp.sco.com/SSE/sse021.tar.Z - replacement binaries
Notes:
This fix is a binary for the following SCO operating systems:
% SCO UnixWare 7.0.1 and earlier releases (not UnixWare 2.1.x)
% SCO OpenServer 5.0.5 and earlier releases
For the latest security bulletins and patches for SCO products,
please refer to http://www.sco.com/security/.
% IBM Corporation
% AIX Versions 4.1.x, 4.2.x, and 4.3.x ARE NOT vulnerable.
% Hewlett-Packard
% HPUX Versions 10.x and 11.x ARE NOT vulnerable.
HP is continuing their investigation.
% Sun Microsystems, Inc.
% SunOS All versions ARE NOT vulnerable.
% Solaris All versions ARE NOT vulnerable.
% Microsoft, Inc.
% IIS Versions 3.0 and 4.0 ARE NOT vulnerable.
% Compaq Computer Corporation
% Digital UNIX V40b - V40e ARE NOT vulnerable.
% TCP/IP(UCX) for OpenVMS V4.1, V4.2, V5.0 ARE NOT vulnerable.
% Silicon Graphics, Inc. (SGI)
% IRIX and Unicos
Currently, Silicon Graphics, Inc. is investigating and no further
information is available for public release at this time.
As further information becomes available, additional advisories
will be issued via the normal SGI security information distribution
method including the wiretap mailing list.
Silicon Graphics Security Headquarters
http://www.sgi.com/Support/security/
% NetBSD
% NetBSD All versions ARE NOT vulnerable.
[Appendix C, Netect Contact Information]
Copyright (c) 1999 by Netect, Inc.
The information contained herein is the property of Netect, Inc.
The contact for this advisory is Jordan Ritter . PGP
signed/encrypted email is preferred.
Visit http://www.netect.com/ for more information.
[ End Netect, Inc. Advisory ]
______________________________________________________________________________
CIAC wishes to acknowledge the contributions of Netect, Inc. for the
information contained in this bulletin.
______________________________________________________________________________
CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.
CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
Voice: +1 925-422-8193
FAX: +1 925-423-8002
STU-III: +1 925-423-2604
E-mail: ciac@llnl.gov
For emergencies and off-hour assistance, DOE, DOE contractor sites,
and the NIH may contact CIAC 24-hours a day. During off hours (5PM -
8AM PST), call the CIAC voice number 925-422-8193 and leave a message,
or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two
Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC
duty person, and the secondary PIN number, 8550074 is for the CIAC
Project Leader.
Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.
World Wide Web: http://www.ciac.org/
(or http://ciac.llnl.gov -- they're the same machine)
Anonymous FTP: ftp.ciac.org
(or ciac.llnl.gov -- they're the same machine)
Modem access: +1 (925) 423-4753 (28.8K baud)
+1 (925) 423-3331 (28.8K baud)
CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
information and Bulletins, important computer security information;
2. SPI-ANNOUNCE for official news about Security Profile Inspector
(SPI) software updates, new features, distribution and
availability;
3. SPI-NOTES, for discussion of problems and solutions regarding the
use of SPI products.
Our mailing lists are managed by a public domain software package
called Majordomo, which ignores E-mail header subject lines. To
subscribe (add yourself) to one of our mailing lists, send the
following request as the E-mail message body, substituting
ciac-bulletin, spi-announce OR spi-notes for list-name:
E-mail to ciac-listproc@llnl.gov or majordomo@rumpole.llnl.gov:
subscribe list-name
e.g., subscribe ciac-bulletin
You will receive an acknowledgment email immediately with a confirmation
that you will need to mail back to the addresses above, as per the
instructions in the email. This is a partial protection to make sure
you are really the one who asked to be signed up for the list in question.
If you include the word 'help' in the body of an email to the above address,
it will also send back an information file on how to subscribe/unsubscribe,
get past issues of CIAC bulletins via email, etc.
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins. If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
Incident Response and Security Teams (FIRST) is a world-wide
organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at http://www.first.org/.
This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
usefulness of any information, apparatus, product, or process
disclosed, or represents that its use would not infringe privately
owned rights. Reference herein to any specific commercial products,
process, or service by trade name, trademark, manufacturer, or
otherwise, does not necessarily constitute or imply its endorsement,
recommendation or favoring by the United States Government or the
University of California. The views and opinions of authors expressed
herein do not necessarily state or reflect those of the United States
Government or the University of California, and shall not be used for
advertising or product endorsement purposes.
LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC)
J-019: Intelligent Peripherals Create Security Risk
J-020: SGI IRIX fcagent daemon Vulnerability
J-021: Sun Solaris Vulnerabilities ( dtmail, passwd )
J-022: HP-UX Vulnerabilities ( snmp, sendmail, remote network command )
J-023: Cisco IOS Syslog Denial-of-Service Vulnerability
J-024: Windows NT Remote Explorer
J-025: W97M.Footprint Macro Virus Detected
J-026: HP-UX rpc.pcnfsd Vulnerability
J-027: Digital Unix Vulnerabilities ( at , inc )
J-028: Sun Solaris Vulnerabilities (sdtcm_convert, man/catman, CDE)
-----BEGIN PGP SIGNATURE-----
Version: 4.0 Business Edition
iQCVAwUBNsntQbnzJzdsy3QZAQHdJAQAvz25CC8FLsRTJArLkUc6kPABrPOj/aI6
vCVFuqadCzYAa7dCC217DS95IiQPFNd11A5QtQnhVBRkBVpDzEOW3lR+tVEobZtZ
nV8DRe000PxmttepPWE82+h0TgvQjxhuZR5nK2sd9pM6U87axKhvGTgpQOpjgsLw
JbwTr5xfrRc=
=CwwA
-----END PGP SIGNATURE-----
TUCoPS is optimized to look best in Firefox® on a widescreen monitor (1440x900 or better).
Site design & layout copyright © 1986-2024 AOH
