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TUCoPS :: Unix :: General :: ciacj065.txt

WU-FTPD Vulnerability




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             __________________________________________________________

                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN
                             Wu-ftpd Vulnerability


September 1, 1999 17:00 GMT                                       Number J-065
______________________________________________________________________________
PROBLEM:        The WU-FTPD Development Group has been informed there is a
                vulnerability in some versions of wu-ftpd.
PLATFORM:       All platforms using:
                wu-ftpd-2.4.2-beta-18-vr4 through wu-ftpd-2.4.2-beta-18-vr15
                wu-ftpd-2.4.2-vr16 and wu-ftpd-2.4.2-vr17
                wu-ftpd-2.5.0
                BeroFTPD, all present versions
                Other derivatives of wu-ftpd may be effected.
DAMAGE:         Exploiting this vulnerability may lead to a root compromise.
SOLUTION:       Upgrade to latest version and apply patch.
______________________________________________________________________________
VULNERABILITY   Risk is high. Exploit information involving this vulnerability
ASSESSMENT:     has been made publicly available.   This vulnerability can
                lead to a root compromise.
______________________________________________________________________________


[  Start WU-FTPD Development Group Advisory  ]


                          WU-FTPD Security Update

The WU-FTPD Development Group has been informed there is a vulnerability in
some versions of wu-ftpd.

This vulnerability may allow local & remote users to gain root privileges.

Exploit information involving this vulnerability has been made publicly
available.

The WU-FTPD Development Group recommends sites take the steps outlined
below as soon as possible.

1.  Description

    Due to insufficient bounds checking on directory name lengths which can
    be supplied by users, it is possible to overwrite the static memory
    space of the wu-ftpd daemon while it is executing under certain
    configurations.  By having the ability to create directories and
    supplying carefully designed directory names to the wu-ftpd, users may
    gain privileged access.

2.  Impact

    This vulnerability may allow local & remote users to gain root
    privileges.

3.  Workarounds/Solution

    Sites may prevent the exploitation of the vulnerability in wu-ftpd by
    immediately upgrading and applying available patches.

3.1 Affected versions

    Versions known to be effected are:

        wu-ftpd-2.4.2-beta-18-vr4 through wu-ftpd-2.4.2-beta-18-vr15
        wu-ftpd-2.4.2-vr16 and wu-ftpd-2.4.2-vr17
        wu-ftpd-2.5.0

        BeroFTPD, all present versions

        Other derivatives of wu-ftpd may be effected.  See the workarrounds
        (section 3.3) to determine if a derivative is vulnerable.

    Versions know to be not effected are:

        NcFTPd, all versions.
        wu-ftpd-2.4.2 (final, from Academ)
        All Washington University versions.

        (Please note: ALL versions of WU-FTPD prior to
         wu-ftpd-2.4.2-beta-18-vr10 including all WU versions, and all
         Academ 2.4.1 and 2.4.2 betas, are vulnerable to a remote user
         root-leveraging attack. See CERT Advisory CA-99-03 'FTP Buffer
         Overflows' at
         http://www.cert.org/advisories/CA-99-03-FTP-Buffer-Overflows.html
         and section 3.2)

3.2 Upgrade to latest wu-ftpd and apply patch

    The latest version of wu-ftpd from the WU-FTPD Development Group is
    2.5.0; sites running earlier versions should upgrade to this version as
    soon as possible.

    The WU-FTPD Development Group has a patch available which corrects this
    vulnerabililty.  The patch is available directly from the WU-FTPD
    Development Group's primary distribution site, and will be propogating
    to its mirrors shortly.

    Several other patches to version 2.5.0 are also available.  The WU-FTPD
    Development Group recommends all available patches be applied.

    Patches for version 2.5.0 are available at the primary distribution
    site:

        ftp://ftp.wu-ftpd.org/pub/wu-ftpd/quickfixes/apply_to_2.5.0/

    The following patches are available:

        CRITICAL-SECURITY.PATCH



[  End WU-FTPD Development Group Advisory  ]

______________________________________________________________________________

CIAC wishes to acknowledge WU-FTPD Development Group 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), use one of the following methods to contact CIAC:

    1.  Call the CIAC voice number 925-422-8193 and leave a message, or

    2.  Call 888-449-8369 to send a Sky Page to the CIAC duty person or

    3.  Send e-mail to 4498369@skytel.com, or

    4.  Call 800-201-9288 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
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E-mail to       ciac-listproc@llnl.gov or majordomo@rumpole.llnl.gov:
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  e.g., subscribe ciac-bulletin

You will receive an acknowledgment email immediately with a confirmation
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If you include the word 'help' in the body of an email to the above address,
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PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
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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.

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