Title: Patch Available to Eliminate New Variant of "File
Fragment Reading via .HTR" Vulnerability
Date: 29 January 2001
Software: IIS 4.0 and 5.0
Impact: File Reading
Bulletin: MS01-004
KB Article: Q285985 (available soon)
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/ms01-004.asp
This vulnerability involves a new variant of the "File Fragment
Reading via .HTR" vulnerability, previous variants of which were
discussed in Microsoft Security Bulletins MS00-031 and MS00-044. Like
the original variants, this one could enable an attacker to request a
file in a way that would cause it to be processed by the .HTR ISAPI
extension. The result of doing this is that fragments of server-side
files like .ASP files could potentially be sent to the attacker.
There is no capability via the vulnerability to add, change or delete
files on the server, or to access a file without permissions.
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