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AUSCERT External Security Bulletin Redistribution
ESB-2006.0492 -- [Solaris]
A Local Unprivileged User May be Able to Cause a Denial of Service (DoS) to
Solaris 10 Hosts via the "/net" Mount Point
24 July 2006
AusCERT Security Bulletin Summary
Product: Solaris 10
Publisher: Sun Microsystems
Operating System: Solaris 10
Impact: Denial of Service
Access: Existing Account
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Sun(sm) Alert Notification
* Sun Alert ID: 102286
* Synopsis: A Local Unprivileged User May be Able to Cause a Denial
of Service (DoS) to Solaris 10 Hosts via the "/net" Mount Point
* Category: Security, Availability
* Product: Solaris 10 Operating System
* BugIDs: 6336467
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 19-Jul-2006
* Date Closed: 19-Jul-2006
* Date Modified:
A security vulnerability in Solaris 10 may allow a local unprivileged
user the ability to panic the system using the special "/net" mount
point (or a similarly configured mount point which uses the "-hosts"
special map), creating a Denial of Service (DoS) condition.
2. Contributing Factors
This issue can occur in the following releases:
* Solaris 10 without patch 118833-11
* Solaris 10 without patch 118855-08
Note: Solaris 8 and Solaris 9 are not impacted by this issue.
This issue only affects systems which have the autofs(4) service
enabled and a "-hosts" entry in the "/etc/auto_master" file.
To determine if a system has the autofs(4) service enabled, the
svcs(1) command can be used:
$ svcs svc:/system/filesystem/autofs:default
STATE STIME FMRI
online Mar_20 svc:/system/filesystem/autofs:default
To determine if a "-hosts" entry is present in the "/etc/auto_master"
file, the grep(1) utility can be used:
$ grep -- -hosts /etc/auto_master
/net -hosts -nosuid,nobrowse
If the described issue occurs, the system will panic with a stack
trace similar to the following:
bad stack overflow at TL 1
To work around the described issue, comment out or remove the
following entry from the "/etc/auto_master" file:
/net -hosts -nosuid,nobrowse
Note: All mounts contained in the "/net" directory will need to be
unmounted, and the automount(1M) command will need to be used for the
above change to take effect.
If it's not possible to unmount any of the mounts in the "/net"
directory due to the file system being busy, then the system will need
to be rebooted after the "auto_master" file has been altered.
This issue is addressed in the following releases:
* Solaris 10 with patch 118833-11 or later
* Solaris 10 with patch 118855-08 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
notification may only be used for the purposes contemplated by these
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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