Public Vulnerability Reports

AOL AmpX ActiveX Control Multiple Buffer Overflow Vulnerabilities

11.09.07

BACKGROUND

America Online's AmpX is an ActiveX control associated with AOL Radio. It is typically used for embedding streaming audio content in web pages. For more information visit the following URL.

http://music.aol.com/radioguide/bb/

DESCRIPTION

Remote exploitation of multiple buffer overflow vulnerabilities in AOL's AmpX ActiveX control could allow attackers to execute arbitrary code with the credentials of the user visiting a malicious website.

Several methods within the vulnerable ActiveX control (CLSID B49C4597-8721-4789-9250-315DFBD9F525) were found to be vulnerable to stack-based buffer overflows. In each case, variable length attacker supplied data is copied into a fixed-size stack buffer using the strcpy() function. Since no input validation is performed, it is possible to corrupt stack memory, resulting in an exploitable condition.

ANALYSIS

Exploitation allows an attacker to execute arbitrary code in the context of the user viewing a malicious web page. In order to be successful, the attacker must persuade a user with the vulnerable control installed into viewing a malicious web page. No further interaction is required.

DETECTION

iDefense has confirmed the existence of this vulnerability in version 2.6.1.11 of America Online's AmpX.dll. Other versions are suspected to be vulnerable.

WORKAROUND

In order to prevent exploitation of this vulnerability, an administrator can set the kill-bit for the vulnerable control. While this does not fix the vulnerability, it does prevent the control from being loaded in Internet Explorer.

VENDOR RESPONSE

"An updated version of AOL Radio with enhanced security features is now available. AOL recommends that you download and install the update to get the best and most secure performance from AOL Radio. If you use AIM or other AOL software, you will automatically receive a prompt to update AOL Radio and you do not need to download and install this update now. Otherwise, please download the update from the URL below and double-click on the file to finish updating AOL Radio:

http://radaol-prod-web-rr.streamops.aol.com/mediaplugin/unagi_patch.exe"

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-5755 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

04/24/2007 Initial vendor notification
04/24/2007 Initial vendor response
11/09/2007 Coordinated public disclosure

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customer service for permission.

Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.