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Flaw Could Enable Web Page to Launch Visual FoxPro 6.0 New

A flaw in the installation routine for Microsoft Visual FoxPro 6.0 means that a web page could cause FoxPro to launch and load a remotely or locally hosted application.

Issue

In general, when an product installs, it should register itself with Internet Explorer. This allows the product to specify how Internet Explorer should handle files associated with it when referenced from a web page – for instance, it allows the product to specify whether the user should be presented with a warning dialogue before such a file is opened.

Visual FoxPro 6.0 does not perform this registration, and this gives rise to a situation in which a web page could automatically launch a Visual FoxPro application (i.e., an .app file). In most cases, this would not result in a security vulnerability – because of the way Visual FoxPro 6.0 evaluates file names, FoxPro itself could be started but the .app file would typically not run. However, if the filename of the application were constructed in a particular way, a second error (associated with how Visual FoxPro 6.0 evaluates application filenames) could not only start FoxPro but allow the application to execute.

The vulnerability could be exploited by creating a web page that references a Visual FoxPro application, and either hosting it on a web site or sending it to a user as an HTML mail. If the user had installed Visual FoxPro 6.0 – or had installed a product that includes the Visual FoxPro 6.0 runtime – and the filename of the application was constructed in a particular way, the application would execute. This would enable the application to not only interrogate databases, but also issue system commands in the user’s security context.

Affected Products

  • Microsoft Visual FoxPro 6.0

Download

Software patches are available from the following locations:

Further Details

Source: Microsoft Corporation

Reference: Microsoft Corporation

Updated: September 4, 2002

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