iDefense Security Advisory 11.09.07 http://labs.idefense.com/intelligence/vulnerabilities/ Nov 09, 2007
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.
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.
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.
iDefense has confirmed the existence of this vulnerability in version 220.127.116.11 of America Online's AmpX.dll. Other versions are suspected to be vulnerable.
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.
VI. 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:
VII. 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.
VIII. DISCLOSURE TIMELINE
04/24/2007 Initial vendor notification 04/24/2007 Initial vendor response 11/09/2007 Coordinated public disclosure
The discoverer of this vulnerability wishes to remain anonymous.
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X. LEGAL NOTICES
Copyright © 2007 iDefense, Inc.
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