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AUSCERT External Security Bulletin Redistribution
ESB-2007.0823 -- [Win]
RealPlayer playlist name stack buffer overflow
22 October 2007
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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-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
Overview
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
later.
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
update.
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:
{FDC7A535-4070-4B92-A0EA-D9994BCC0DC5}
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
References
http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://service.real.com/realplayer/security/191007_player/en/
http://www.securityfocus.com/bid/26130
http://www.symantec.com/enterprise/security_response/weblog/2007/10/realplayer_exploit_on_the_loos.html
http://support.microsoft.com/kb/240797
Credit
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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