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AUSCERT External Security Bulletin Redistribution
ESB-2007.0779 -- [Solaris]
Security Vulnerability in the Solaris Auditing (BSM) Related to Network
Auditing May Lead to Denial of Service (DoS)
12 October 2007
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AusCERT Security Bulletin Summary
---------------------------------
Product: Solaris Auditing (BSM)
Publisher: Sun Microsystems
Operating System: Solaris 10 Operating System
Impact: Denial of Service
Access: Existing Account
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-103096-1
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Sun(sm) Alert Notification
* Sun Alert ID: 103096
* Synopsis: Security Vulnerability in the Solaris Auditing (BSM)
Related to Network Auditing May Lead to Denial of Service (DoS)
* Category: Security
* Product: Solaris 10 Operating System
* BugIDs: 6573175
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 10-Oct-2007
* Date Closed: 10-Oct-2007
* Date Modified:
1. Impact
A security vulnerability in the Solaris Auditing (BSM) included with
Solaris 10 may allow a local unprivileged user to cause a system panic
on hosts which are configured to audit networking events. This would
result in a Denial of Service (DoS) to the system as a whole.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 127111-01
x86 Platform
* Solaris 10 without patch 127112-01
Note: Solaris 8 and Solaris 9 are not impacted by this issue.
This issue only affects hosts which have Solaris Auditing enabled (see
bsmconv(1M)) and are configured to audit networking events (those
included in the "nt" auditing class).
To determine if Solaris Auditing is enabled on a system, a command
such as the following can be used to search the "/etc/system" file for
a reference to the "c2audit" kernel module:
$ grep c2audit /etc/system
set c2audit:audit_load = 1
To determine which audit classes have been configured on the system,
consult the audit_control(4) and audit_user(4) files. Note also that
it is possible to enable audit classes for individual processes using
the auditconfig(1M) command.
A command such as the following can be run as root to determine which
classes are enabled for a specific process:
# auditconfig -getpinfo <process id> | grep 'mask'
process preselection mask = lo,nt(0x1100,0x1100)
This command should be applied to all processes, or at least any
processes which may have had their audit preselection mask modified by
a system administrator.
3. Symptoms
If this issue has been exploited to cause a Denial of Service (DoS),
the system will panic in the au_getsonode() function.
The following is an example of a stack trace which may result from
this issue:
au_getsonode+0x20(3, d07c3eb0, 0)
auf_bind+0x33(d0c1e198, 0, d07c3f28)
audit_finish+0xdc(180, e8, 0, d07c3f28)
[...]
4. Relief/Workaround
To work around this issue, auditing of the "nt" class can be disabled.
This can be done by modifying the audit_control(4) and audit_user(4)
files and then either rebooting the system or modifying the audit
preselection mask of running processes on the system using
auditconfig(1M) with the "-setpmask" argument.
Note: Applying this workaround will reduce the thoroughness of the
auditing data produced on the host as network events will no longer be
audited.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 127111-01 or later
x86 Platform
* Solaris 10 with patch 127112-01 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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