Operating System:

[Solaris]

Published:

27 February 2006

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                        ESB-2006.0144 -- [Solaris]
            Security Vulnerability in the hsfs(7FS) File System
                             27 February 2006

===========================================================================

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

Publisher:         Sun Microsystems
Operating System:  Solaris 10 and prior
Impact:            Root Compromise
                   Denial of Service
Access:            Existing Account

Original Bulletin: 
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102161-1

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Sun(sm) Alert Notification
     * Sun Alert ID: 102161
     * Synopsis: Security Vulnerability in the hsfs(7FS) File System
     * Category: Security
     * Product: Solaris 9 Operating System, Solaris 10 Operating System,
       Solaris 8 Operating System
     * BugIDs: 6244328
     * Avoidance: Patch, Workaround
     * State: Resolved
     * Date Released: 24-Feb-2006
     * Date Closed: 24-Feb-2006
     * Date Modified: 

1. Impact

   A security vulnerability in the Solaris file system driver for
   hsfs(7FS) file systems may allow local unprivileged users the
   ability to panic the system, creating a Denial of Service (DoS)
   condition, and/or execute arbitrary code with elevated privileges.

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 8 without patch 109764-06
     * Solaris 9 without patch 116047-03
     * Solaris 10 without patch 119596-03

   x86 Platform
     * Solaris 8 without patch 109765-06
     * Solaris 9 without patch 121995-01
     * Solaris 10 without patch 118813-03

3. Symptoms

   If the described issue occurs, the system will panic with BAD TRAPs at
   various locations in the hsfs(7FS) module. There are many potential
   stack traces, but the most frequent panic has a stack trace similar to
   the following:
    <trap>genunix:segmap_getmapflt+0x30([ ... ])
    genunix:fbread+0x60([ ... ])
    hsfs:hs_dirlook+0x1e0()
    hsfs:hsfs_lookup([ ... ])
    genunix:lookuppnvp+0x2ac([ ... ])
    genunix:lookuppnat+0x124([ ... ])
    genunix:lookupnameat+0xb0([ ... ])
    genunix:lookupname([ ... ])
    genunix:chdir+0x14([ ... ])
    unix:syscall_trap32+0xa8()

   Note: The above example is only one of several failure modes (the most
   pervasive)that may be seen. 

4. Relief/Workaround

   To work around the described issue, sites may choose to disable the
   use of CDROM media by removing the references to the hsfs(7FS) file
   system from "/etc/vold.conf" and commenting out the lines in
   "/etc/rmmount.conf" referring to the hsfs(7FS) file system.

   To identify the references to the hsfs(7FS) file system, the following
   command can be run:
    $ grep hsfs /etc/vold.conf /etc/rmmount.conf
    /etc/vold.conf:unsafe ufs hsfs pcfs udfs
    /etc/rmmount.conf:ident hsfs ident_hsfs.so cdrom
    /etc/rmmount.conf:mount * hsfs udfs ufs -o nosuid

   To disallow CDROM access for unprivileged users, do the following:

   Replace the lines:
    /etc/vold.conf:unsafe ufs hsfs pcfs udfs
    /etc/rmmount.conf:ident hsfs ident_hsfs.so cdrom
    /etc/rmmount.conf:mount * hsfs udfs ufs -o nosuid

   With:
    /etc/vold.conf:unsafe ufs pcfs udfs
    /etc/rmmount.conf:#ident hsfs ident_hsfs.so cdrom
    /etc/rmmount.conf:#mount * hsfs udfs ufs -o nosuid

   Note: The example shown above is on an unmodified Solaris 9 system.

5. Resolution

   This issue is addressed in the following releases:

   SPARC platform
     * Solaris 8 with patch 109764-06 or later
     * Solaris 9 with patch 116047-03 or later
     * Solaris 10 with patch 119596-03 or later

   x86 Platform
     * Solaris 8 with patch 109765-06 or later
     * Solaris 9 with patch 121995-01 or later
     * Solaris 10 with patch 118813-03 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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