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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgendes Sun Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.

Sun Bug ID 6800703 – Preisgabe von Informationen im Solaris smbfs(7FS)
Dateisystem

Ein Fehler im Solaris smbfs(7FS) Dateisystem erlaubt es bei Verwendung
der Default Rechte fuer smbfs Mounts jedem lokalen Benutzer,
saemtliche Dateien des betroffenen Dateisystems zu lesen. Ein lokaler
Angreifer kann so an evtl. vertrauliche Informationen gelangen.

Betroffen sind die folgenden Software Pakete und Plattformen:

OpenSolaris

SPARC Plattform
* OpenSolaris basierend auf den Builds snv_84 bis snv_110

x86 Plattform
* OpenSolaris basierend auf den Builds snv_84 bis snv_110

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

Weiterhin existieren Workarounds:

Als Workaround koennen die Rechte fuer smbfs Mounts geaendert werden
bzw. vorhandene Dateisysteme mit restriktiveren Rechten gemountet
werden, z.B. mit

# mount -F smbfs -o dirperms=700,fileperms=600 …

Hersteller Advisory:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-257548-1

(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
Klaus Moeller, DFN-CERT

– —
Dipl. Inform. Klaus Moeller (Incident Response Team)
Phone: +49 40 808077-555, Fax: +49 40 808077-556

DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrase 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski

Solution Type Sun Alert
Solution 257548 : A Security Vulnerability in OpenSolaris smbfs(7FS)
may Expose Data to Unauthorized Users
Related Categories

* Home>Content>Sun Alert Criteria Categories>Security
* Home>Content>Sun Alert Release Phase>Resolved

Bug ID
6800703

Product
OpenSolaris

Date of Resolved Release
10-Jun-2009

SA Document Body
A security vulnerability in OpenSolaris smbfs(7FS) may expose data to unauthori
zed users:

1. Impact
Information disclosure security vulnerability in OpenSolaris smbfs(7FS)
when using default mount permissions may allow a local unprivileged
user unauthorized access to read contents of the files and list
directories on a CIFS (Common Internet File System) mounted volume.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* OpenSolaris based upon builds snv_84 through snv_110

x86 Platform
* OpenSolaris based upon builds snv_84 through snv_110

Note 1: Solaris 8, 9 and 10 are not impacted by this issue.
Note 2: OpenSolaris distributions may include additional bug fixes
above and beyond the build from which it was derived. To determine the
base build of OpenSolaris, the following command can be used:
$ uname -v
snv_86

Note 3: This issue only affects systems which are setup to allow
mouting of CIFS shares. This can be determined by checking the status
of the “svc:/network/smb/client” service using a command such as the
following:
$ svcs svc:/network/smb/client:default
STATE STIME FMRI
disabled 14:22:02 svc:/network/smb/client:default

To determine if a mounted CIFS volume is vulnerable, first locate the
mount point of any CIFS volumes on the host using a command such as the
following:
# mount -v | grep smbfs
//server/share on /mnt type smbfs
remote/read/write/setuid/devices/intr/noxattr/dev=6480002 on Wed Jun 10 11:
42:10 2009

and then check the permissions of all the directories and files located
on the mounted volume by using the “ls” command similar to the
following:
# ls -ld /mnt
drwxr-xr-x 1 root root 16384 Apr 9 18:20 /mnt

The output from the above command will indicate which users and groups
have permission to access the contents of the examined directory.

3. Symptoms
There are no predictable symptoms that would indicate the described
vulnerability has been exploited.
4. Workaround
To work around the described issue, first unmount the affected share,
and remount it with options to set the permissions of the CIFS mount
point to 700 by using the following command:
# mount -F smbfs -o dirperms=700,fileperms=600 …

5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* OpenSolaris based upon builds snv_111 or later

x86 Platform
* OpenSolaris based upon builds snv_111 or later

For more information on Security Sun Alerts, see Technical Instruction
ID 213557.
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 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
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