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                                   CERT-Renater

                        Note d'Information No. 2009/VULN246
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DATE                      : 15/06/2009

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : OpenSolaris running smbfs.

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http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-257548-1
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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
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   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
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   notification may only be used for the purposes contemplated by these
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   Copyright 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved


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