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AUSCERT External Security Bulletin Redistribution
ESB-2006.0493 -- [Solaris]
Local Users May be Able to Hang Systems That Have Loaded The
Kernel Debugger kmdb(1)
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: 102512
* Synopsis: Local Users May be Able to Hang Systems That Have Loaded
The Kernel Debugger kmdb(1)
* Category: Security
* Product: Solaris 10 Operating System
* BugIDs: 6296934
* Avoidance: Patch
* State: Resolved
* Date Released: 19-Jul-2006
* Date Closed: 19-Jul-2006
* Date Modified:
A local unprivileged user may be able to hang an x86 system that has
loaded the kernel debugger kmdb(1). The ability to hang a system is a
type of Denial of Service (DoS).
2. Contributing Factors
This issue can occur in the following release:
* Solaris 10 without patch 118855-15
Note 1: This issue does not affect the SPARC platform.
Note 2: This issue does not affect Solaris 8 or 9.
Note 3: This issue only affects systems which have loaded the kernel
debugger, kmdb(1). In order to determine if a system has loaded
kmdb(1) the following command can be used:
$ modinfo | grep kmdb
178 f7d54ce8 3b8 171 1 kmdb (kmdb driver 1.3)
If the system has not loaded kmdb(1), no output will be seen.
If the described issue occurs, the system will hang and be
inaccessible both locally and via the network.
There is no workaround. Please see the "Resolution" section below.
This issue is addressed in the following release:
* Solaris 10 with patch 118855-15 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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