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CERT Coordination Center


Adobe Shockwave player vulnerable to downgrading

Vulnerability Note VU#546769

Original Release Date: 2012-12-17 | Last Revised: 2014-07-24

Overview

Adobe Shockwave Player may automatically install a legacy version of the runtime, which can increase the attack surface of systems that have Shockwave installed.

Description

Adobe Macromedia Shockwave Player is software that plays active web content developed in Macromedia and Adobe Director. According to the Director 11 and Shockwave 11 Whitepaper:

When the user launches Shockwave content from a browser, the Shockwave 11 ActiveX control is downloaded to the
<%System%>/Adobe/Shockwave 11 folder. If the HTML page does not specify the playerVersion as 11, the
Shockwave 10.4.0.025 ActiveX control is downloaded silently, and installed in the
<%System%>/Macromed/Shockwave10 folder.
Also:
The Shockwave auto-update mechanism installs Shockwave 11 only. The compatibility components of Shockwave
10.4.0.025 player are installed only when the user tries to play old Shockwave content with the compatibility
parameter set to 10 or blank.
Because of this design, attackers can simply target vulnerabilities in the Shockwave 10 runtime, or any of the Xtras provided by Shockwave 10. For example, the legacy version of Shockwave provides Flash 8.0.34.0, which was released on November 14, 2006 and contains multiple, known vulnerabilities.

Impact

By convincing a user to view a specially crafted Shockwave content (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user.

Solution

We are currently unaware of a practical solution to this problem. Please consider the following workarounds:


Limit access to Director files

Restricting the handling of untrusted Director content may help mitigate this vulnerability. See Securing Your Web Browser for more information. Consider using the NoScript extension to whitelist web sites that can run Shockwave Player in Mozilla browsers such as Firefox. See the NoScript FAQ for more information.

Disable the Shockwave Player ActiveX control in Internet Explorer

The Shockwave Player ActiveX control can be disabled in Internet Explorer by setting the kill bit for the following CLSIDs:
{166B1BCA-3F9C-11CF-8075-444553540000}
{233C1507-6A77-46A4-9443-F871F945D258}
More information about how to set the kill bit is available in Microsoft Support Document 240797.Alternatively, the following text can be saved as a .REG file and imported to set the kill bit for this control:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{166B1BCA-3F9C-11CF-8075-444553540000}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{166B1BCA-3F9C-11CF-8075-444553540000}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{233C1507-6A77-46A4-9443-F871F945D258}]
"Compatibility Flags"=dword:00000400
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{233C1507-6A77-46A4-9443-F871F945D258}]
"Compatibility Flags"=dword:00000400

Use the Microsoft Enhanced Mitigation Experience Toolkit

The Microsoft Enhanced Mitigation Experience Toolkit (EMET) can be used to help prevent exploitation of this vulnerability. CERT/CC has created a video tutorial for setting up EMET 3.0 on Windows 7. Note that platforms that do not support ASLR, such as Windows XP and Windows Server 2003, will not receive the same level of protection that modern Windows platforms will.

Enable DEP in Microsoft Windows

Consider enabling Data Execution Prevention (DEP) in supported versions of Windows. DEP should not be treated as a complete workaround, but it can mitigate the execution of attacker-supplied code in some cases. Microsoft has published detailed technical information about DEP in Security Research & Defense blog posts "Understanding DEP as a mitigation technology" part 1 and part 2. DEP should be used in conjunction with the application of patches or other mitigations described in this document.

Note that when relying on DEP for exploit mitigation, it is important to use a system that supports Address Space Layout Randomization (ASLR) as well. ASLR is not supported by Windows XP or Windows Server 2003 or earlier. ASLR was introduced with Microsoft Windows Vista and Windows Server 2008. Please see the Microsoft SRD blog entry: On the effectiveness of DEP and ASLR for more details.

Vendor Information

546769
Expand all

Adobe

Notified:  October 27, 2010 Updated:  October 27, 2011

Status

  Affected

Vendor Statement

No statement is currently available from the vendor regarding this vulnerability.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

Addendum

There are no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us email.


CVSS Metrics

Group Score Vector
Base 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N
Temporal 3.7 E:POC/RL:W/RC:C
Environmental 3.2 CDP:L/TD:M/CR:ND/IR:ND/AR:ND

References

Credit

This vulnerability was reported by Will Dormann of the CERT/CC

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2012-6270
Severity Metric: 12.83
Date Public: 2012-12-17
Date First Published: 2012-12-17
Date Last Updated: 2014-07-24 20:29 UTC
Document Revision: 29

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