MS Interactive Training .cbo Overflow

["Brett Moore" <brett.moore () security-assessment com>]

========================================================================
= MS Interactive Training .cbo Overflow
=
= MS Bulletin posted: 
= http://www.microsoft.com/technet/security/bulletin/MS07-005.mspx
=
= Affected Software:
=    Microsoft Windows 2000
=    Microsoft Windows XP  
=    Microsoft Windows Server 2003
=
= Public disclosure on February 14, 2007
========================================================================

== Overview ==

When thinking about buffer overflow vulnerabilities, a file can
sometimes
be as harmful as a packet. Even though past security issues have taught
us that it is unwise to use a string from a file/packet without first
checking its length, this is what happened here.

MS Interactive Training will open a file with a .cbo extension and read 
in the Syllabus details.

Through the creation of a corrupt file, with a long Syllabus string it
is 
possible to gain control of EIP and execute arbitrary code.

== Exploitation ==

Remote exploitation through Internet Explorer can be obtained through 
hosting a malicious .cbo file which will be downloaded and opened 
automatically.

== Solutions ==

- Install the vendor supplied patch.

== Credit ==

Discovered and advised to Microsoft May, 2006 by Brett Moore of
Security-Assessment.com

== About Security-Assessment.com ==

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development, and its team continues to identify and responsibly publish 
vulnerabilities in public and private software vendor's products. 
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