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AUSCERT External Security Bulletin Redistribution
ESB-2009.0562 -- [OpenSolaris]
smbfs: Read-only Data Access
12 June 2009
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AusCERT Security Bulletin Summary
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Product: smbfs
Publisher: Sun Microsystems
Operating System: OpenSolaris
Impact: Read-only Data Access
Access: Existing Account
CVE Names: CVE-2009-2031
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-257548-1
Revision History: June 12 2009: Added CVE Reference
June 12 2009: Initial Release
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Solution Type: Sun Alert
Solution 257548 : A Security Vulnerability in OpenSolaris
smbfs(7FS) may Expose Data to Unauthorized Users
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
unauthorized 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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