Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2003.0668 -- HEWLETT-PACKARD COMPANY SECURITY BULLETIN
SSRT3603 wu-ftpd off by one vulnerability (rev.1)
22 September 2003
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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
ESB-2003.0613
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**REVISED 01**
Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0309-277
Originally issued: 02 September 2003
Last revised: 15 September 2003
SSRT3603 wu-ftpd off by one vulnerability (rev.1)
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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.
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PROBLEM: The wu-ftpd program is potentially vulnerable to a buffer
overflow.
IMPACT: Potential remote denial of service.
PLATFORM: HP-UX releases B.11.00, B.11.11, and B.11.22 running
wu-ftpd.
SOLUTION: Install replacement ftpd file, web upgrade, or disable
ftp write access.
MANUAL ACTIONS: Yes - NonUpdate
--> 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.
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A. Background
This potential vulnerability has been publicly reported:
<http://www.kb.cert.org/vuls/id/743092>
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.
AFFECTED VERSIONS
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
installed.
HP-UX B.11.22
=============
InternetSrvcs.INETSVCS2-RUN
fix: install ftpd.1122 or disable ftp write access
HP-UX B.11.11
=============
WUFTP-26.INETSVCS-FTP
--> fix: revision B.11.11.01.003 or subsequent
--> (WU-FTPD 2.6.1 from software.hp.com)
HP-UX B.11.00
=============
WUFTP-26.INETSVCS-FTP
--> fix: revision B.11.00.01.003 or subsequent
--> (WU-FTPD 2.6.1 from software.hp.com)
END AFFECTED VERSIONS
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 (192.170.19.51)
Login: wuftp
Password: wuftp
FTP Access: ftp://wuftp:wuftp@hprc.external.hp.com/
or: ftp://wuftp:wuftp@192.170.19.51/
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.
cksum:
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:
HPSBUX9408-016
Patch sums and the MD5 program
Note: Using your itrc account security bulletins can be
found here:
http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin
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
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
at:
http://itrc.hp.com
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.
or
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:
http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin
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:
http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
displayProductInfo.pl?productNumber=B6834AA
The security patch matrix is also available via anonymous
ftp:
ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/
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:
2D2A7D59
HP Security Response Team (Security Bulletin signing only)
<security-alert@hp.com>
Fingerprint =
6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59
If you have problems locating the key please write to
security-alert@hp.com. Please note that this key is
for signing bulletins only and is not the key returned
by sending 'get key' to security-alert@hp.com.
D. To report new security vulnerabilities, send email to
security-alert@hp.com
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 security-alert@hp.com.
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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.
________________________________________________________________
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