Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2016.0667
Security Bulletin: Vulnerability in Install of Informix
Dynamic Server on Windows (CVE-2016-0226)
11 March 2016
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: IBM Informix Servers
Publisher: IBM
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Resolution: Mitigation
CVE Names: CVE-2016-0226
Original Bulletin:
http://www.ibm.com/support/docview.wss?uid=swg21978598
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletin: Vulnerability in Install of Informix Dynamic Server on
Windows (CVE-2016-0226)
Document information
More support for:
Informix Servers
Software version:
11.7
Operating system(s):
Windows
Reference #:
1978598
Modified date:
2016-03-10
Security Bulletin
Summary
IBM Informix Dynamic Server could allow a local user to modify the
nsrexecd.exe file in the ISM directory. A local user can replace the
nsrexecd.exe service binary with a file of his choice, and that binary will be
executed as a service in the context of system.
Vulnerability Details
Installation creates an ISM directory under the root of C: . The permissions
for files in this directory get inherited for directories and files created
under ISM. The resulting weak ACL is inherited from the default ACL on the ISM
directory. Because of this vulnerability, any authenticated user can replace
the service binary with a file of his choice, and that binary will be executed
as a service in the context of system.
CVEID: CVEID: CVE-2016-0226
DESCRIPTION: IBM Informix Dynamic Server Install could leave the ACL of the
C:\ISM directory vulnerable such that a local user can replace the
nsrexecd.exe service binary with a file of his choice.
CVSS Base Score: 8.4
CVSS Temporal Score: See
https://exchange.xforce.ibmcloud.com/vulnerabilities/110087 for the current
score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Affected Products and Versions
IBM Informix Dynamic Server 11.70.xCn on Windows Platforms
Remediation/Fixes
The fix is to change the ACL on the C:\ISM directory so that unauthorized
users cant change the content of this directory.
There is a script available on FixCentral that will make this change.
Workarounds and Mitigations
System administrators can manually change the ACL of the C:\ISM directory
Get Notified about Future Security Bulletins
Subscribe to My Notifications to be notified of important product support
alerts like this.
References
Complete CVSS v3 Guide
On-line Calculator v3
Related information
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Acknowledgement
The vulnerability was reported to IBM by Steven Seeley of Source Incite
working with HP's Zero Day Initiative
*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the impact of
this vulnerability in their environments by accessing the links in the
Reference section of this Security Bulletin.
Disclaimer
According to the Forum of Incident Response and Security Teams (FIRST), the
Common Vulnerability Scoring System (CVSS) is an "industry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY
OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT
OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
- --------------------------END INCLUDED TEXT--------------------
You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.
NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members. As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.
NOTE: This is only the original release of the security bulletin. It may
not be updated when updates to the original are made. If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.
Contact information for the authors of the original document is included
in the Security Bulletin above. If you have any questions or need further
information, please contact them directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/render.html?cid=1980
===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for member emergencies only.
===========================================================================
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967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=XYB2
-----END PGP SIGNATURE-----