AUSCERT External Security Bulletin Redistribution

             SSRT3603 wu-ftpd off by one vulnerability (rev.1)
                             22 September 2003


        AusCERT Security Bulletin Summary

Product:                wu-ftpd
Publisher:              Hewlett-Packard
Operating System:       HP-UX 11.22
                        HP-UX 11.11
                        HP-UX 11.00
Platform:               HP9000 Series 700/800
Impact:                 Root Compromise
Access Required:        Remote
CVE Names:              CAN-2003-0466

Ref:                    AL-2003.13

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Hash: SHA1

**REVISED 01**
 Originally issued: 02 September 2003
 Last revised: 15 September 2003
 SSRT3603 wu-ftpd off by one vulnerability (rev.1)

NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.

The information in the following Security Bulletin should be
acted upon as soon as possible.  Hewlett-Packard Company will
not be liable for any consequences to any customer resulting
from customer's failure to fully implement instructions in this
Security Bulletin as soon as possible.

PROBLEM: The wu-ftpd program is potentially vulnerable to a buffer

IMPACT: Potential remote denial of service.

PLATFORM: HP-UX releases B.11.00, B.11.11, and B.11.22 running

SOLUTION: Install replacement ftpd file, web upgrade, or disable
          ftp write access.

 -->            B.11.00 - Install web upgrade.
 -->            B.11.11 - Install web upgrade.
 -->            B.11.22 - Install replacement ftpd file.

AVAILABILITY:  The files are available now via ftp.
 -->           The web upgrade is available on
 -->           software.hp.com.

CHANGE SUMMARY: Rev.01 - B.11.00 and B.11.11 web upgrades
                         are available.
 A. Background
    This potential vulnerability has been publicly reported:

    Note:  The vulnerability report above mentions a problem with
           realpath(3) in addition to the wu-ftpd problem.  The
           realpath(3) supplied with HP-UX is not vulnerable.
           Only the wu-ftpd is potentially vulnerable.


     The following is a list by HP-UX revision of
     affected filesets and the fileset revision or
     patch containing the fix.  To determine if a
     system has an affected version, search the
     output of "swlist -a revision -l fileset"
     for an affected fileset, then determine if
     a fixed revision or the applicable patch is

     HP-UX B.11.22
     fix: install ftpd.1122 or disable ftp write access

     HP-UX B.11.11
 --> fix: revision B. or subsequent
 -->      (WU-FTPD 2.6.1 from software.hp.com)

     HP-UX B.11.00
 --> fix: revision B. or subsequent
 -->      (WU-FTPD 2.6.1 from software.hp.com)


 B. Recommended solution

    Install replacement ftpd file, web upgrade,  or disable
    ftp write access.

    Wu-ftp may not be present on B.11.00 and B.11.11.
    Verify that a fileset containing wu-ftp is installed
    by running:

        swlist -l fileset | grep WUFTP-26.INETSVCS-FTP

**REVISED 01**
 -->For B.11.00 and B.11.11 install WU-FTPD 2.6.1 or subsequent
 -->from <http://software.hp.com>.

**REVISED 01**
 -->For B.11.22:

       a. Download the file from the following ftp site
          into a protected directory such as /etc.

        System:    hprc.external.hp.com  (
        Login:     wuftp
        Password:  wuftp

        FTP Access: ftp://wuftp:wuftp@hprc.external.hp.com/
                or: ftp://wuftp:wuftp@
                or: ftp hprc.external.hp.com

        Note: There is an ftp defect in IE5 that may result in
               a browser hang.  To work around this:
        - Select Tools -> Internet Options -> Advanced
        - Un-check the option:
        - Un-check the option:
                  [ ] Enable folder view for FTP sites

       b. Verify the cksum or the md5 sum.

          1095458663 553468 ftpd.1122

          MD5 (ftpd.1122) = c0bfdd16bc8218048e1e8ad7f4648632

     Note: If you wish to verify the md5 sum and you do not
           have a copy of md5, please refer to:
               Patch sums and the MD5 program
     Note: Using your itrc account security bulletins can be
          found here:

     c. Install the file.

        cd to the directory containing the new ftpd files.

        cp ftpd.1122 /usr/lbin/ftpd.1122
        cd /usr/lbin
        chown bin:bin ftpd.1122
        chmod 544 ftpd.1122
        mv ftpd ftpd.orig
        mv ftpd.1122 ftpd

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(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company.  Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.


Version: PGP Personal Security 7.0.3


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