Note: This is an archival copy of Security Sun Alert 257548 as previously published on
Latest version of this security advisory is available from as Sun Alert 1020395.1.
Article ID : 1020395.1
Article Type : Sun Alerts (SURE)
Last reviewed : 2009-06-09
Audience : PUBLIC
Copyright Notice: Copyright © 2010, Oracle Corporation and/or its affiliates.

A Security Vulnerability in OpenSolaris smbfs(7FS) may Expose Data to Unauthorized Users


Release Phase

Bug Id


Date of Resolved Release

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
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
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 1009886.1.

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