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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0823 -- [Win]
              RealPlayer playlist name stack buffer overflow
                              22 October 2007


        AusCERT Security Bulletin Summary

Product:              RealPlayer
Publisher:            US-CERT
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-5601

Original Bulletin:    http://www.kb.cert.org/vuls/id/871673

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Vulnerability Note VU#871673

RealPlayer playlist name stack buffer overflow

RealPlayer contains a stack buffer overflow in the handling of playlist names, 
which can allow a remote, unauthenticated attacker to execute arbitrary code on 
a vulnerable system.

I. Description
RealNetworks RealPlayer is a multimedia application that allows users to view 
local and remote audio/video content. The RealPlayer Database Component, which 
is provided by MPAMedia.dll, contains a stack buffer overflow in the handling 
of playlist names. The RealPlayer IERPCtl ActiveX control, which is provided 
by ierpplug.dll, can be used to import a local file into a specified playlist 
in RealPlayer. This can be used to trigger the buffer overflow vulnerability. 
The ActiveX control is present in RealPlayer version 9 (RealOne Player) and 

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), a remote, unauthenticated 
attacker may be able to execute arbitrary code with the privileges of the user 
on a vulnerable system.

III. Solution
Apply an update

Please see the Security Update from RealNetworks. The update will provide newer 
versions of the RealPlayer Database Component for RealPlayer 10.5 and 
RealPlayer 11 beta. Users with RealOne Player, RealOne Player v2 or RealPlayer 
10 should first update to RealPlayer 10.5 or later and then apply the security 

Disable the IERPCtl ActiveX control in Internet Explorer

The ActiveX control that can be used as an attack vector can be disabled in 
Internet Explorer by setting the kill bit for the following CLSID:


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\{FDC7A535-4070-4B92-A0EA-D9994BCC0DC5}]
      "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   20-Oct-2007




This vulnerability was analyzed and confirmed by US-CERT on October 13, 2007.

This document was written by Will Dormann.

Other Information
Date Public             10/18/2007
Date First Published    10/20/2007 10:25:17 AM
Date Last Updated       10/21/2007

CERT Advisory	 
CVE Name     CVE-2007-5601
Metric       34.02

Document Revision	19

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