Security Bulletin: IBM SPSS SamplePower c1sizer ActiveX control vulnerability (CVE-2012-5946)

Abstract

There is a security vulnerability with the c1sizer ActiveX control shipped by IBM SPSS SamplePower Version 3. The vulnerability allow remote attackers to execute arbitrary code on installations of SamplePower when the control is invoked as ActiveX by Microsoft Internet Explorer.

Content

VULNERABILITY DETAILS:

CVE IDs: CVE-2012-5946

DESCRIPTION: It is possible for an attacker to compromise the c1sizer ActiveX control used within IBM SPSS SamplePower to remotely execute arbitrary code by instantiating this control from Microsoft Internet Explorer. For a remote attacker to exploit these vulnerabilities in SamplePower releases, the following must be accomplished:

1. The user must have IBM SPSS SamplePower installed on the machine.

2. Attacker needs to create malicious code that would exploit the ActiveX control. When handling the TabCaption buffer, C1sizer.ocx does not properly check the size before running lstrcatA. lpString1 is not large enough to contain lpString2, and therefore will cause a buffer overflow.

As of April 24 , 2013, IBM has not received any reports of customer issues related to these security vulnerabilities.

These vulnerabilities were reported to IBM by HP’s Zero Day Initiative (ZDI) and discovered by a third-party researcher, Alexander Gavrun, working with ZDI.

CVSS:
Using the Common Vulnerability Scoring System (CVSS) v2, the security ratings for these issues are:

CVSS Base Score: 9.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/80562&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:N/C:C/I:C/A:C)

AFFECTED PLATFORMS:
IBM SPSS SamplePower for Windows V3.0

REMEDIATION:
The recommended solution is to apply the workaround as soon as possible or download and install the IBM SamplePower 3.0 FP1.

Workaround:
Disable the use of the vulnerable ActiveX control within Internet Explorer.

Note: This solution contains information about modifying the Microsoft operating system registry. Before making any modifications with the Microsoft Registry Editor, it is strongly recommended that you make a backup of the existing registry. For more information about how to back up the registry refer to Microsoft Knowledge Base article 256986.

The vulnerable ActiveX control can be disabled in Internet Explorer by manually setting the kill bit. Complete the following steps to set the kill bit on the machine where SamplePower is installed.

1. Start the Microsoft Windows Registry Editor (regedit).

2. Navigate to **HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveXCompatibility

**
3. Add a new Key:
**{24E04EBF-014D-471F-930E-7654B1193BA9}

**
4. Select that Key and create a new DWORD value named:
**Compatibility Flags

**
5. Set the Compatibility Flags value to:
**0x00000400

**
6. Exit the Registry Editor.

7. Restart Internet Explorer.

Mitigation(s):
None known apply the workaround.

REFERENCES:

• Complete CVSS Guide
• On-line Calculator V2
• CVE-2012-5946 - <https://exchange.xforce.ibmcloud.com/vulnerabilities/80562&gt;

Note: 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.

Related Information

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