Vulnerability Note VU#568681

AOL Radio AOLMediaPlaybackControl.exe stack buffer overflow

Overview

The AOL AOLMediaPlaybackControl application contains a stack buffer overflow, which may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.

I. Description

AOL Radio includes several ActiveX controls to stream audio in web pages. The AOL AmpX and CoAxTrack ActiveX controls, which are provided by AmpX.dll and axtrack.dll respectively, use a program called AOLMediaPlaybackControl.exe. The AOLMediaPlaybackControl application contains a stack buffer overflow that is exploitable via the AppendFileToPlayList() method in the AmpX and CoAxTrack ActiveX controls.

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

Apply an update

This vulnerability is addressed in automatic updates provided by AOL, which remove the AmpX control and AOLMediaPlaybackControl.exe. AOL update 4194.13.4 contains the fix for U.S. versions of AOL, and 4195.9.4 contains the fix for international versions. This update is also available as a manual install as the Unagi update. The AmpX ActiveX control version 2.6.2.6 also appears to prevent the buffer overflow vulnerability in AOLMediaPlaybackControl.exe from being reached. If you are unable to apply an update, please consider the following workarounds.

Disable the AmpX and CoAxTrack ActiveX controls in Internet Explorer

The ActiveX controls associated with AOLMediaPlaybackControl.exe can be disabled in Internet Explorer by setting the kill bit for the following CLSIDs:

{B49C4597-8721-4789-9250-315DFBD9F525}
{B9F3009B-976B-41C4-A992-229DCCF3367C}
{FA3662C3-B8E8-11D6-A667-0010B556D978}
{FE0BD779-44EE-4A4B-AA2E-743C63F2E5E6}

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_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{B49C4597-8721-4789-9250-315DFBD9F525}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{B9F3009B-976B-41C4-A992-229DCCF3367C}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{FA3662C3-B8E8-11D6-A667-0010B556D978}]
"Compatibility Flags"=dword:00000400

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftInternet ExplorerActiveX Compatibility{FE0BD779-44EE-4A4B-AA2E-743C63F2E5E6}]
"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
America Online, Inc.	Vulnerable	16-Jan-2008

References

http://www.cert.org/tech_tips/securing_browser/#Internet_Explorer
http://radaol-prod-web-rr.streamops.aol.com/mediaplugin/unagi_patch.exe
http://secunia.com/advisories/28399/
http://www.securityfocus.com/bid/27207

Credit

This vulnerability was reported by Will Dormann of the CERT/CC.

This document was written by Will Dormann.

Other Information

Date Public	01/09/2008
Date First Published	01/09/2008 02:23:25 PM
Date Last Updated	01/17/2008
CERT Advisory
CVE Name	CVE-2007-6250
Metric	4.65
Document Revision	14