February 2006

ID: 00159
Ref: 157/2006
Date: 27 February 2006:11:23:08
Version: 1

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Title: Sun Microsystems Advisory: 102161 - Security Vulnerability in the hsfs(7FS) File System
Abstract:
Vendors affected: Sun
Operating systems affected: Sun
Applications affected: Sun

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Title
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Sun Microsystems Advisory: 102161 - Security Vulnerability in the hsfs(7FS)
File System

Detail
======

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.



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

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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:
* 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:
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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