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ESB-2016.0667 - [Win] IBM Informix Servers: Execute arbitrary code/commands - Existing account

Date: 11 March 2016

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===========================================================================
             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--------------------

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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===========================================================================
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