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Home » Hacking News » Hewlett Packard HPSBUX0304-254: SMB/CIFS remote root compromise

Hewlett Packard HPSBUX0304-254: SMB/CIFS remote root compromise

by Nikola Strahija on April 14th, 2003 A vulnerability has been found in CIFS server version A.01.09.02 and prior which, if exploited, may allow remote attackers to gain root access.


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Source: HEWLETT-PACKARD COMPANY
SECURITY BULLETIN: HPSBUX0304-254
Originally issued: 09 April 2003
SSRT3536 Potential Security Vulnerability in CIFS/9000 Server
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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.

-----------------------------------------------------------------
PROBLEM: CIFS/9000 Server is potentially vulnerable to altered
SMB/CIFS network messages.

IMPACT: Potential remote root access.

PLATFORM: All HP9000 servers running CIFS/9000 Server versions up
through A.01.09.02 on HP-UX 11.0, 11.11(11i), and 11.22

SOLUTION: HP-UX 11.0/11.11
Download and install the smbd.11.00.r1 file containing
the fix. This file must be manually installed on the
CIFS Server version A.01.09.01 or A.01.09.02

HP-UX 11.22
The CIFS Server must be disabled until the new
CIFS/9000 Server version A.01.09.03 is available on
software.hp.com


MANUAL ACTIONS: Yes - NonUpdate

HP-UX 11.0/11.11
Install the smbd.11.00.r1 file.

HP-UX 11.22
Disable the CIFS/9000 Server.

AVAILABILITY: The temporary fix, smbd.11.00.r1, is available now.
This bulletin will be revised when web upgrades
are available.
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A. Background

Note: Although having similar descriptions, this is a
different vulnerability from that described in
HPSBUX0303-251:
SSRT3509 Potential Security Vulnerability
in CIFS/9000 Server
Using the fix described in this bulletin will correct
both vulnerabilities.


Note: The following are not vulnerable:

HP OpenVMS
HP NonStop Servers
HP Secure Web Servers for HP Tru64 UNIX
HP Secure Web Servers for HP Tru64 OpenVMS

As further information becomes available HP
will provide notice of the availability of any
additional Samba updates through standard security
bulletin announcements and information will be
available from your normal HP Services support channel.

CIFS Server version A.01.09.02 and prior may allow modified
SMB/CIFS messages to cause smbd to overwrite portions of its
own process address space. This could potentially be
exploited to gain root access remotely.

The latest version of CIFS Server adds checks for proper
SMB/CIFS messages to prevent invalid smbd memory accesses.

B. Recommended solution

If /opt/samba/bin/smbd is present on a system the following
instructions should be followed.

HP-UX 11.0/11.11
================
Update to version A.01.09.02 (available on software.hp.com)
if running versions of CIFS Server prior to A.01.09.01 .
Then download and install the fixed smbd as detailed below.

When available on software.hp.com, install the complete CIFS
Server 2.2e package (version A.01.09.03) to update the entire
product.


Instructions for installing the fixed smbd:

NOTE: If CIFS Server version A.01.09.03 is already installed,
this fixed smbd is not needed.

1. Update to CIFS Server version A.01.09.02 if necessary.
The CIFS Server is available on software.hp.com

2. Download new smbd.11.00.r1.gz binary file:

System: hprc.external.hp.com (192.170.19.51)
Login: samba
Password: samba

FTP Access: ftp://samba:[email protected]/
or: ftp://samba:[email protected]/
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:
[ ] Enable folder view for FTP sites

3. Unpack the file with gunzip and verify the cksum or
the md5 sum:

cksum:
638984860 2555904 smbd.11.00.r1

MD5 (smbd.11.00.r1) = 1b9aed7552aa94d86e8bbe47cda16778

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

4. Replace current smbd file with new version:

Back up the original smbd file : /opt/samba/bin/smbd

Stop CIFS/9000 Server if it is running.

Copy the downloaded smbd.11.00.r1 to /opt/samba/bin/smbd
Note: smbd.11.00.r1 is for both HP-UX 11.00 and
HP-UX 11.11 (11i).

Restart CIFS/9000 Server if it had been running.


HP-UX 11.22
===========
Disable the CIFS/9000 Server.

When available on software.hp.com, update to CIFS/9000 Server
version A.01.09.03


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)

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]



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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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