Note: This is an archival copy of Security Sun Alert 238251 as previously published on http://sunsolve.sun.com.
Latest version of this security advisory is available from http://support.oracle.com as Sun Alert 1019295.1.
Article ID : 1019295.1
Article Type : Sun Alerts (SURE)
Last reviewed : 2010-01-19
Audience : PUBLIC
Copyright Notice: Copyright © 2010, Oracle Corporation and/or its affiliates.

A Security Vulnerability in samba(7) Domain logons may allow execution of Arbitrary code with Root privileges



Category
Security

Release Phase
Resolved

Bug Id
6640253

Product
Solaris 9 Operating System
Solaris 10 Operating System
SAMBA

Date of Workaround Release
30-May-2008

Date of Resolved Release
11-Jun-2008

A Security Vulnerability in samba(7) Domain logons may allow execution of Arbitrary code with Root privileges

1. Impact

A stack-based buffer overflow security vulnerability exists in the send_mailslot function in nmbd(8) in Samba 3.0.0 through 3.0.27a when the "domain logons" option is enabled. This vulnerability may allow a remote unprivileged user the ability to execute arbitrary code as "root" user via a GETDC mailslot request composed of a long GETDC string following an offset username in a SAMLOGON logon request.

More info on this issue can be found in the following document:


2. Contributing Factors

This issue can occur in the following releases:

SPARC Platform
  • Solaris 9 without patch 114684-11
  • Solaris 10 without patch 119757-10
x86 Platform
  • Solaris 9 without patch 114685-11
  • Solaris 10 without patch 119758-10
with the following versions of Samba software:
  • Samba 3.0.0 through 3.0.27a

Note: Solaris 8 does not include the Samba software and is therefore not affected by this issue.

To determine the version of Samba installed on a system, the following command can be run:

% /usr/sfw/sbin/smbd -V
Version  3.0.4

This issue only affects systems configured as Samba servers that have enabled the netlogon service for Windows 9X network logons.

To determine if a system is configured as a Samba server, the following command can be run to check for processes related to Samba:

% ps -ef | grep mbd
root   317     1   0   May 26 ?           0:01 /usr/sfw/sbin/smbd -D
root   325   317   0   May 26 ?           0:00 /usr/sfw/sbin/smbd -D
root   314     1   0   May 26 ?           0:27 /usr/sfw/sbin/nmbd -D
root 28369 17382   0 23:17:46 pts/2       0:00 grep mbd

If the output shows "smbd" or "nmbd" running as a daemon (with the -D parameter), the system is configured as a Samba server.

To determine if the Samba server has enabled the netlogon service for Windows 9X network logons, the following steps may be employed:

1. Verify that the process "/usr/sfw/sbin/nmbd -D" is running. This may be done using the ps(1) command as shown above.

2. Verify that the "domain logons" configuration parameter is set to "yes" to provide the netlogon service for Windows 9X network logons. This may be verified looking into the /etc/sfw/smb.conf file.

For more details, please see the Samba documentation at:

http://us1.samba.org/samba/docs/man/manpages-3/smb.conf.5.html#DOMAINLOGONS

3. Symptoms

There are no predictable symptoms that would indicate the described vulnerability has been exploited to run arbitrary code.

4. Workaround

To work around the described issue, the netlogon service for Windows 9X network logons may be stopped. This can be achieved by modifying the "domain logons" entry in the /etc/sfw/smb.conf file to "no". The Samba server must be restarted after making this modification for the changes to take effect. This may be done using the following command (as 'root' user):

On Solaris 9:

# /etc/init.d/samba stop
# /etc/init.d/samba start

On Solaris 10:

# svcadm disable wins
# svcadm enable wins

5. Resolution

This issue is addressed in the following releases:

SPARC Platform
  • Solaris 9 with patch 114684-11 or later
  • Solaris 10 with patch 119757-10 or later
x86 Platform
  • Solaris 9 with patch 114685-11 or later
  • Solaris 10 with patch 119758-10 or later

For more information on Security Sun Alerts, see 1009886.1.

This Sun Alert notification is being provided to you on an "AS IS" basis. This Sun Alert notification may contain information provided by third parties. The issues described in this Sun Alert notification may or may not impact your system(s). Sun makes no representations, warranties, or guarantees as to the information contained herein. ANY AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN. This Sun Alert notification contains Sun proprietary and confidential information. It is being provided to you pursuant to the provisions of your agreement to purchase services from Sun, or, if you do not have such an agreement, the Sun.com Terms of Use. This Sun Alert notification may only be used for the purposes contemplated by these agreements.

Copyright 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, CA 95054 U.S.A. All rights reserved.


Modification History
11-Jun-2008: Updated Contributing Factors and Resolution sections; RESOLVED


References

119757-10
119758-10
114684-11
114685-11





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