Security Bulletin: Rational Rhapsody for Windows Blueberry FlashBack ActiveX Control vulnerabilities (CVE-2011-1388, CVE-2011-1391, CVE-2011-1392)

Security Bulletin


Summary

There are multiple high risk security vulnerabilities with the Blueberry FlashBack ActiveX control shipped by IBM Rational Rhapsody for Windows V7.6 and earlier versions. Problem occurs outside Rhapsody when control is invoked as ActiveX by Microsoft Internet Explorer.

Vulnerability Details

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CVE IDs: CVE-2011-1388, CVE-2011-1391, CVE-2011-1392

Important Note: FlashBack is a third-party control that may have been installed by other applications. If other applications are using FlashBack, you must also implement the workaround. You should contact the appropriate vendor or vendors whose applications also use FlashBack.

Description: It is possible for an attacker to compromise the Blueberry FlashBack ActiveX control ("BB FlashBack Recorder.dll") used within Rational Rhapsody for Windows to remotely execute arbitrary code by instantiating this control from Microsoft Internet Explorer Web browsers.

Known methods of exploiting the vulnerabilities in this control include Start(), PauseAndSave(), InsertMarker(), InsertSoundToFBRAtMarker() and TestCompatibilityRecordMode().

For a remote attacker to exploit these vulnerabilities in Rhapsody releases, the following must be accomplished:

  1. You must have Rational Rhapsody installed on the machine.
    • Important Note: Continuous use of Rhapsody is not required; the vulnerabilities may be exploited against the ActiveX control regardless of the use of the product.
  2. Attacker needs to create malicious code that would exploit the ActiveX control. This code could be part of an attachment by means of e-mail or a Web page.
  3. User must be persuaded to execute the attachment or follow a Web site link that contains the malicious code via the Microsoft Internet Explorer Web browser.
  4. On Internet Zone, the user must authorize the ActiveX pop-up dialog before it could be used.
  5. As of December 21, 2011, IBM has not received any reports of customer issues related to these security vulnerabilities.

CVSS Base Score: 9.3
CVSS Temporal Score: For CVE-2011-1388, see http://xforce.iss.net/xforce/xfdb/71694 for the current score
CVSS Temporal Score: For CVE-2011-1391, see http://xforce.iss.net/xforce/xfdb/71803 for the current score
CVSS Temporal Score: For CVE-2011-1392, see http://xforce.iss.net/xforce/xfdb/71804 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:M/Au:S/C:N/I:P/A:N)

Affected Products and Versions

Rational Rhapsody for Windows 7.5.x
Rational Rhapsody for Windows 7.6

Remediation/Fixes

Upgrade to Rational Rhapsody 7.6.1 or later.

Workarounds and Mitigations

Workarounds:
Option #1 - Disable the use of the vulnerable ActiveX control within Internet Explorer.


Option #2
- Disable ActiveXProperly securing your Web browser to limit ActiveX controls can help avoid this issue. Limiting the ActiveX controls would both notify the user, and force the user to take some action to allow the ActiveX functionality.

Note: The Firefox browser does not support ActiveX controls.


Option #1 - Disable the use of the vulnerable ActiveX control within Internet Explorer

Disclaimer

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

The vulnerable ActiveX control can be disabled in Internet Explorer by setting the kill bit.

Execute the following steps to disable the vulnerable ActiveX control in Internet Explorer:

  1. Copy the attached reg file (CFM kill-bit.zip) to the desktop.
    Ensure you are executing this file with the appropriate permissions required to modify the operating system registry.

    Note: The registry file contains the following entry (if you are not able to download the file at end of document):

    Windows Registry Editor Version 5.00
    [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{A3CD4BF9-EC17-47A4-833C-50A324D6FF35}]
    "Compatibility Flags"=dword:00000400


    [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{A3CD4BF9-EC17-47A4-833C-50A324D6FF35}]
    "Compatibility Flags"=dword:00000400

  2. Double-click the CFM kill-bit.reg file.

  3. You will be prompted with a dialog box asking:
    "Are you sure you want to add the information in <path> to the registry?"

  4. Click Yes

  5. You will be prompted with another dialog where it confirms the successful addition of entries into registry

  6. Click OK

More information about how to set the kill bit is available in Microsoft Support Document 240797.

Option #2 - Disable ActiveX Disabling all ActiveX controls in the Internet Zone (or any zone used by an attacker) can prevent exploitation of this and other ActiveX vulnerabilities, although it might lead to usability issues with sites that might require it.

http://securitywatch.eweek.com/browsers/how_to_disable_activex_controls_in_internet_explorer_1.html


Mitigation:

None

References

Related information

Acknowledgement

These vulnerabilities were discovered by Andrea Micalizzi aka rgod, working with TippingPoint's Zero Day Initiative (ZDI).

*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.

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Document information


More support for:

Rational Rhapsody
General Information

Software version:

7.5, 7.5.0.1, 7.5.1, 7.5.1.1, 7.5.2, 7.5.2.1, 7.5.3, 7.5.3.1, 7.5.3.2, 7.5.3.3, 7.6, 7.6.0.1

Operating system(s):

Windows

Reference #:

1576352

Modified date:

2012-01-03

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