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Home » Hacking News » Hewlett Packard SSRT3603: wu-ftpd remote denial of service

Hewlett Packard SSRT3603: wu-ftpd remote denial of service

by Nikola Strahija on September 2nd, 2003 A vulnerability has been found in wu-ftpd daemon which could allow remote attackers to issue a denial of service attack.

Hash: SHA1

Originally issued: 02 September 2003
SSRT3603 wu-ftpd off by one vulnerability

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 or disable ftp write

Install replacement ftpd file.

AVAILABILITY: The files are available now via ftp.

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: install ftpd.1111 or disable ftp write access

HP-UX B.11.00
fix: install ftpd.1100 or disable ftp write access


B. Recommended solution

Install replacement ftpd file 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

Note: All the files mentioned for download below are
available from the following ftp site:

System: (
Login: wuftp
Password: wuftp

FTP Access: ftp://wuftp:[email protected]/
or: ftp://wuftp:[email protected]/
or: ftp

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

a. Download the files into a protected directory
such as /etc.

b. Verify the cksum or the md5 sum.

862512408 225280 ftpd.1100
4043866688 253952 ftpd.1111
1095458663 553468 ftpd.1122

MD5 (ftpd.1100) = a3d06c8ad592ae791b7214f9bcd0f4c8
MD5 (ftpd.1111) = d70906027286e656fe46f1137560e957
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 appropriate file.

cd to the directory containing the new ftpd files.

HP-UX B.11.00
cp ftpd.1100 /usr/lbin/ftpd.1100
cd /usr/lbin
chown bin:bin ftpd.1100
chmod 544 ftpd.1100
mv ftpd ftpd.orig
mv ftpd.1100 ftpd

HP-UX B.11.11
cp ftpd.1111 /usr/lbin/ftpd.1111
cd /usr/lbin
chown bin:bin ftpd.1111
chmod 544 ftpd.1111
mv ftpd ftpd.orig
mv ftpd.1111 ftpd

HP-UX B.11.22
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

C. To subscribe to automatically receive future NEW HP Security
Bulletins from the HP IT Resource Center via electronic
mail, do the following:

Use your browser to get to the HP IT Resource Center page

Use the 'Login' tab at the left side of the screen to login
using your ID and password. Use your existing login or the
"Register" button at the left to create a login, in order to
gain access to many areas of the ITRC. Remember to save the
User ID assigned to you, and your password.

In the left most frame select "Maintenance and Support".

Under the "Notifications" section (near the bottom of
the page), select "Support Information Digests".

To -subscribe- to future HP Security Bulletins or other
Technical Digests, click the check box (in the left column)
for the appropriate digest and then click the "Update
Subscriptions" button at the bottom of the page.


To -review- bulletins already released, select the link
(in the middle column) for the appropriate digest.

NOTE: Using your itrc account security bulletins can be
found here:

To -gain access- to the Security Patch Matrix, select
the link for "The Security Bulletins Archive". (near the
bottom of the page) Once in the archive the third link is
to the current Security Patch Matrix. Updated daily, this
matrix categorizes security patches by platform/OS release,
and by bulletin topic. Security Patch Check completely
automates the process of reviewing the patch matrix for
11.XX systems. Please note that installing the patches
listed in the Security Patch Matrix will completely
implement a security bulletin _only_ if the MANUAL ACTIONS
field specifies "No."

The Security Patch Check tool can verify that a security
bulletin has been implemented on HP-UX 11.XX systems providing
that the fix is completely implemented in a patch with no
manual actions required. The Security Patch Check tool cannot
verify fixes implemented via a product upgrade.

For information on the Security Patch Check tool, see:

The security patch matrix is also available via anonymous

On the "Support Information Digest Main" page:
click on the "HP Security Bulletin Archive".

The PGP key used to sign this bulletin is available from
several PGP Public Key servers. The key identification
information is:

HP Security Response Team (Security Bulletin signing only)

Fingerprint =
6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59

If you have problems locating the key please write to
[email protected] Please note that this key is
for signing bulletins only and is not the key returned
by sending 'get key' to [email protected]

D. To report new security vulnerabilities, send email to

[email protected]

Please encrypt any exploit information using the
security-alert PGP key, available from your local key
server, or by sending a message with a -subject- (not body)
of 'get key' (no quotes) to [email protected]


(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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