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16 March 2008

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             AUSCERT External Security Bulletin Redistribution

                          ESB-2008.0257 -- [Win]
 RealNetworks RealPlayer ActiveX controls property heap memory corruption
                               17 March 2008


        AusCERT Security Bulletin Summary

Product:              RealPlayer
Publisher:            US-CERT
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2008-1309

Original Bulletin:    http://www.kb.cert.org/vuls/id/831457

Revision History:     March 17 2008: Added CVE
                      March 13 2008: Initial Release

- --------------------------BEGIN INCLUDED TEXT--------------------

Vulnerability Note VU#831457

RealNetworks RealPlayer ActiveX controls property heap memory corruption


Multiple RealPlayer ActiveX controls fail to properly handle properties, which
can allow a remote, unauthenticated attacker to execute arbitrary code on a 
vulnerable system.

I. Description
RealNetworks RealPlayer provides multiple ActiveX controls to allow integration
with Internet Explorer. The ActiveX controls provided by the file rmoc3260.dll
fail to properly handle multiple properties, including Console. Setting these 
properties can result in heap memory corruption.

II. Impact
By convincing a user to view a specially crafted HTML document (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.

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

Disable the RealPlayer ActiveX controls in Internet Explorer

The vulnerable ActiveX controls can be disabled in Internet Explorer by 
setting the kill bit for the following CLSIDs:


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 these controls:

      Windows Registry Editor Version 5.00

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{0FDF6D6B-D672-463B-846E-C6FF49109662}]
      "Compatibility Flags"=dword:00000400

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{224E833B-2CC6-42D9-AE39-90B6A38A4FA2}]
      "Compatibility Flags"=dword:00000400

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{2F542A2E-EDC9-4BF7-8CB1-87C9919F7F93}]
      "Compatibility Flags"=dword:00000400

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{3B46067C-FD87-49B6-8DDD-12F0D687035F}]
      "Compatibility Flags"=dword:00000400

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{3B5E0503-DE28-4BE8-919C-76E0E894A3C2}]
      "Compatibility Flags"=dword:00000400

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{44CCBCEB-BA7E-4C99-A078-9F683832D493}]
      "Compatibility Flags"=dword:00000400

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{A1A41E11-91DB-4461-95CD-0C02327FD934}]
      "Compatibility Flags"=dword:00000400

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA}]
      "Compatibility Flags"=dword:00000400

Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an 
attacker) appears to prevent exploitation of this and other ActiveX 
vulnerabilities. Instructions for disabling ActiveX in the Internet Zone can 
be found in the "Securing Your Web Browser" document. 

Systems Affected

Vendor                   Status       Date Updated
RealNetworks, Inc.      Vulnerable     11-Mar-2008




This vulnerability was publicly disclosed by Elazar Broad.

This document was written by Will Dormann.

Other Information
Date Public             03/10/2008
Date First Published    03/11/2008 01:55:45 PM
Date Last Updated       03/11/2008

CERT Advisory	 
CVE Name 
US-CERT Technical Alerts	 
Metric   17.15
Document Revision  2

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