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             AUSCERT External Security Bulletin Redistribution

                        ESB-2007.0073 -- [Solaris]
 A Security Vulnerability in the Solaris 10 Loopback FileSystem (LOFS) May
       Allow Files in a Non-global Zone to be Moved or Renamed From
                           a Read-Only Fileystem
                              5 February 2007

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              Loopback File System
Publisher:            Sun Microsystems
Operating System:     Solaris 10
Impact:               Denial of Service
                      Reduced Security
Access:               Existing Account

Original Bulletin:
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102699-1

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Sun(sm) Alert Notification
     * Sun Alert ID: 102699
     * Synopsis: A Security Vulnerability in the Solaris 10 Loopback
       FileSystem (LOFS) May Allow Files in a Non-global Zone to be Moved
       or Renamed From a Read-Only Fileystem
     * Category: Security
     * Product: Solaris 10 Operating System
     * BugIDs: 6366432
     * Avoidance: Patch
     * State: Resolved
     * Date Released: 01-Feb-2007
     * Date Closed: 01-Feb-2007
     * Date Modified: 

1. Impact

   Local privileged users inside a non-global zone may be able to move or
   rename files which are part of a read-only mounted loopback file
   system (see lofs(7FS)). This filesystem may be shared with the global
   zone, which would result in the files being removed from the global
   zone also.  This can result in a Denial of Service (DoS) to the
   non-global zone and the global zone.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 10 without patch 118833-28

   x86 Platform
     * Solaris 10 without patch 118855-28

   Note: Solaris 8 and Solaris 9 are not impacted by this issue.

   This issue only impacts systems which have non-global zones configured
   with the read-only LOFS root filesystem using the root filesystem of
   the global zone as the underlying filesystem.

   To determine if a system is configured with non-global zones utilizing
   read-only loopback filesystems the following commands can be run from
   the global zone:

   1. Display the name of the current zones on the system:
    $ zoneadm list -cv
    ID NAME             STATUS         PATH
    0 global           running        /
    2 localzone1       running        /zones/localzone1
    3 localzone2       running        /export/localzone2

   2. Search the mounted file system table file (mnttab(4)) for read-only
   and loopback entries for the path to the non-global zones (as listed
   under the "PATH" heading above):
    $ egrep "(/zones/localzone1|/export/localzone2).*lofs.*ro"
    /lib - /zones/localzone1/root/lib lofs - no ro,nodevices,nosub
    /usr - /export/localzone2/root/usr lofs - no ro,nodevices,nosub

   Any pathname which is found by the egrep(1) command is affected by
   this issue.

3. Symptoms

   If this issue has been exploited, the user may notice files missing or
   moved out of the affected filesystem, either in the global zone or in
   the non-global zone. Services which depend on these files may no
   longer be available. 

4. Relief/Workaround

   There is no workaround. Please see the "Resolution" section below.

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform
     * Solaris 10 with patch 118833-28 or later

   x86 Platform
     * Solaris 10 with patch 118855-28 or later

   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 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
   Clara, CA 95054 U.S.A. All rights reserved

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