Public Vulnerability Reports

Akamai Download Manager Arbitrary Program Execution Vulnerability



Akamai Download Manager is an integral component of Akamai's global distribution service. It is used to deliver big files quickly and reliably to users around world. It has been used by vendors such as Symantec and Microsoft to provide downloads to the public.

Akamai provides both an ActiveX and a Java based Download Manager. If a user uses the ActiveX control once, it will remain installed on the users computer until manually removed. For more information, please visit following web sites.


Remote exploitation of a design error in Akamai Technologies, Inc's Download Manager allows attackers to execute arbitrary code in the context of the current user.

The ActiveX control version has the following identifiers:

 Class: DownloadManager Control CLSID: 2AF5BD25-90C5-4EEC-88C5-B44DC2905D8B CLSID: FFBB3F3B-0A5A-4106-BE53-DFE1E2340CB1 ProgId: MANAGER.DLMCtrl.1. File: C:WindowsDownloaded Program FilesDownloadManagerV2.ocx 

The Java version has the following identifiers:

 Class: JAR: dlm-java- 

This problem specifically exists due to two undocumented object parameters. By using these parameters, it is possible to cause Download Manager to automatically download and execute arbitrary binaries from attacker controlled locations.


Exploitation allows an attacker to execute arbitrary code in the context of the user viewing a maliciously crafted web page.

In order to exploit this vulnerability, an attacker would need to persuade, or otherwise force, a user to view a malicious web page. This is usually accomplished by getting the targeted user to click a link in a form of electronic communication such as e-mail or instant messaging.

While the attack is happening, the Download Manager user interface is displayed. However, in a normal attack scenario there is insufficient time to cancel the download before exploitation occurs.


iDefense confirmed the existence of this vulnerability using version of Akamai Technologies Inc's DownloadManagerV2.ocx. Additionally, iDefense confirmed the problem exists in version of the Download Manager Java Applet. All versions prior to the fixed version are suspected to be vulnerable.


Setting kill-bits for the associated CLSIDs will prevent the ActiveX control from being loaded within Internet Explorer, thereby preventing exploitation.

Disabling Java will prevent exploitation using the Java Applet version.


Akamai has addressed this vulnerability with the release of version of their Download Manager product. For more information, refer to their advisory. To download the updated version, visit the following URL.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-6339 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


12/06/2007 Initial vendor notification
12/06/2007 Initial vendor response
04/30/2008 Public disclosure


This vulnerability was reported to iDefense by Peter Vreugdenhil.

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Copyright © 2008 Verisign, Inc.

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