-----BEGIN PGP SIGNED MESSAGE-----
AUSCERT External Security Bulletin Redistribution
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
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
CVE Names: CVE-2016-0226
- --------------------------BEGIN INCLUDED TEXT--------------------
Security Bulletin: Vulnerability in Install of Informix Dynamic Server on
More support for:
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.
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
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
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.
Complete CVSS v3 Guide
On-line Calculator v3
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
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.
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 email@example.com
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:
Australian Computer Emergency Response Team
The University of Queensland
Internet Email: firstname.lastname@example.org
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-----
-----END PGP SIGNATURE-----