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AUSCERT External Security Bulletin Redistribution
ESB-2008.0257 -- [Win]
RealNetworks RealPlayer ActiveX controls property heap memory corruption
17 March 2008
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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
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Vulnerability Note VU#831457
RealNetworks RealPlayer ActiveX controls property heap memory corruption
Overview
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:
{0FDF6D6B-D672-463B-846E-C6FF49109662}
{224E833B-2CC6-42D9-AE39-90B6A38A4FA2}
{2F542A2E-EDC9-4BF7-8CB1-87C9919F7F93}
{3B46067C-FD87-49B6-8DDD-12F0D687035F}
{3B5E0503-DE28-4BE8-919C-76E0E894A3C2}
{44CCBCEB-BA7E-4C99-A078-9F683832D493}
{A1A41E11-91DB-4461-95CD-0C02327FD934}
{CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA}
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
References
http://secunia.com/advisories/29315/
http://archives.neohapsis.com/archives/fulldisclosure/2008-03/0157.html
http://isc.sans.org/diary.html?storyid=4120
http://lists.grok.org.uk/pipermail/full-disclosure/2008-March/060659.html
Credit
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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