Title: URL Parsing and Plain Text Password disclosure in Best Buy Employee

Toolkit Software

Provided by: cm`

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Best Buy Employee Toolkit Interactive is a software program used

nationally by Best Buy Terminal Systems. The software allows employees the

ability to check multiple systems throughout the internal network. A URL

Parsing vulnerability in the configuration screen could allow an attacker

to execute a command shell interface and hijack certain network

connections or read plain-text passwords.

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Impact: High

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Analysis:

-URL Parsing

By pressing CTRL+SHIFT within the Employee Toolkit software and

clicking on the exit button, a logged in user is given access to the

Toolkit's configuration screen. An area within the configuration screen

allows a logged in user to enter a URL. There are no bounds checking on

what is entered in the URL area and an attacker could use this to execute

a local command shell or execute other programs locally stored.

-Plain-text Password Disclosure

Once an attacker has executed a local command shell, they then have

access to the root directory which houses a batch file that remotely

mounts the Store's central server. The batch file uses the 'net use'

command to map the server's drive and holds the password for the

administrator of the central server in plain text.

By combining the trickery of both the URL Parsing vulnerability and the

plain-text password disclosure an attacker could execute telnet to

remotely log into the central server as the administrator.

Finding the servers on the local area network is as easy as executing

the 'net view' command at command shell. Another method for finding these

servers is to open a page within the employee toolkit and pressing CTRL+P

to bring up the printing interface. Choose to print the text to a file

then click the network button. This will bring up all of the computers

connected to the Best Buy network.

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Vendor Status:

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05/05/2003 - Best Buy notified of vulnerability.

06/12/2003 - Best Buy coordinates with IBM to release a fix; Patch

ineffective.

06/12/2003 - Best Buy notified of patch ineffectivness, I was told

vulnerability was not a serious problem.

07/27/2003 - Best Buy notified again of vulnerability and its impact.

08/14/2003 - No Response from Best Buy.

08/14/2003 - Public Disclosure.

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