Public Vulnerability Reports

Multiple Vendor NOS Microsystems getPlus Downloader Input Validation Vulnerability

02.23.10

BACKGROUND

The getPlus Downloader is an application download and installation manager, distributed in the form of an ActiveX control. This control is used by Adobe Systems Inc. to install Adobe Reader through the Adobe website when Internet Explorer is used. Part of the functionality of the getPlus Downloader is to download and execute applications from preconfigured sites; in the case of Adobe, from adobe.com and its subdomains. For more information, see the vendor's site found at the following link.

http://www.nosltd.com/index.php?option=com_content&task=view&id=38&Itemid=26

DESCRIPTION

Remote exploitation of an input validation vulnerability in NOS Microsystems Ltd.'s getPlus Download Manager, as used by Adobe and potentially other vendors, could allow an attacker to execute arbitrary code with the privileges of the current user.

The vulnerability exists due to improper validation of the domain used to download and execute applications from. The vulnerable code always assumes that the domain being validated is a subdomain, which can lead to a logic error when comparing the valid domain and the requested domain.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user viewing the web page. To exploit this vulnerability, a targeted user must load a malicious webpage created by an attacker. An attacker typically accomplishes this via social engineering or injecting content into compromised, trusted sites. After the user visits the malicious web page, no further user interaction is needed.

DETECTION

iDefense has confirmed the existence of this vulnerability in getPlus version 1.5.2.35 as distributed by Adobe. The Adobe Download Manager on Windows (prior to February 23, 2010) has been confirmed vulnerable by Adobe.

WORKAROUND

Setting the killbit for CLSID 'CF40ACC5-E1BB-4aff-AC72-04C2F616BCA7' will prevent this control from loading in Internet Explorer.

VENDOR RESPONSE

Adobe Systems Inc. has released a solution which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown. http://www.adobe.com/support/security/bulletins/apsb10-08.html

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2010-0189 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

06/09/2009 Initial Vendor Notification
06/09/2009 Initial Vendor Reply
02/23/2010 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by Yorick Koster.

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LEGAL NOTICES

Copyright © 2010 Verisign, Inc.

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