Message reçu à l'instant de Microsoft. Cela éviteras que quelqu'un abuse de votre serveur Web personnel :
 
 
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Title:      Cumulative Patch for Internet Information Service  
            (Q327696)
Date:       30 October 2002
Software:   Internet Information Service
Impact:     Four vulnerabilities, the most serious of which  
            could enable applications on a server to gain  
            system-level privileges.
Max Risk:   Moderate  
Bulletin:   MS02-062
 
Microsoft encourages customers to review the Security Bulletin at:  
http://www.microsoft.com/technet/s [...] 2-062.asp.
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Issue:
======
This patch is a cumulative patch that includes the functionality of
all security patches released for IIS 4.0 since Windows  
NT 4.0 Service Pack 6a, and all security patches released to date for
IIS 5.0 and 5.1. A complete listing of the patches  
superseded by this patch is provided below, in the section titled
"Additional information about this patch". Before applying  
the patch, system administrators should take note of the caveats
discussed in the same section.  
 
In addition to including previously released security patches, this
patch also includes fixes for the following newly  
discovered security vulnerabilities affecting IIS 4.0, 5.0 and/or
5.1:  
 - A privilege elevation vulnerability affecting the way ISAPIs
   are launched when an IIS 4.0, 5.0 or 5.1 server is configured  
   to run them out of process. By design, the hosting process  
   (dllhost.exe) should run only in the security context of the  
   IWAM_computername account; however, it can actually be made to  
   acquire LocalSystem privileges under certain circumstances,  
   thereby enabling an ISAPI to do likewise.  
 - A denial of service vulnerability that results because of a flaw
   in the way IIS 5.0 and 5.1 allocate memory for WebDAV requests.  
   If a WebDAV request were malformed in a particular way, IIS would
   allocate an extremely large amount of memory on the server. By  
   sending several such requests, an attacker could cause the server
   to fail.  
 - A vulnerability involving the operation of the script source  
   access permission in IIS 5.0. This permission operates in  
   addition to the normal read/write permissions for a virtual  
   directory, and regulates whether scripts, .ASP files and  
   executable file types can be uploaded to a write-enabled virtual  
   directory. A typographical error in the table that defines the  
   file types subject to this permission has the effect of omitting
   .COM files from the list of files subject to the permission. As a  
   result, a user would need only write access to upload such a file.
 - A pair of Cross-Site Scripting (CSS) vulnerabilities affecting  
   IIS 4.0, 5.0 and 5.1, and involving administrative web page. Each
   of these vulnerabilities have the same scope and effect: an  
   attacker who was able to lure a user into clicking a link on his  
   web site could relay a request containing script to a third-party  
   web site running IIS, thereby causing the third-party site's
   response (still including the script) to be sent to the user.  
   The script would then render using the security settings of  
   the third-party site rather than the attacker's.  
 
In addition, the patch causes 5.0 and 5.1 to change how frequently
the socket backlog list - which, when all connections on a  
server are allocated, holds the list of pending connection requests -
is purged. The patch changes IIS to purge the list more  
frequently in order to make it more resilient to flooding attacks.
The backlog monitoring feature is not present in IIS 4.0.
 
Mitigating Factors:
====================
Out of Process Privilege Elevation:  
 - This vulnerability could only be exploited by an attacker  
   who already had the ability to load and execute applications
   on an affected web server. Normal security practices recommend
   that untrusted users not be allowed to load applications onto  
   a server, and that even trusted users' applications be  
   scrutinized before allowing them to be loaded.  
 
WebDAV Denial of Service:  
 - The vulnerability does not affect IIS 4.0, as WebDAV is not  
   supported in this version of IIS.  
 - The vulnerability could only be exploited if the server allowed
   WebDAV requests to be levied on it. The IIS Lockdown Tool  
   
(http://www.microsoft.com/technet/security/tools/tools/locktool.asp),
   if deployed in its default configuration, disables such requests.  
 
Script Source Access Vulnerability:  
 - The vulnerability could only be exploited if the administrator  
   had granted all users write and execute permissions to one or  
   more virtual directories on the server. Default configurations of  
   IIS would be at no risk from this vulnerability.  
 - The vulnerability does not affect IIS 4.0, as WebDAV is not  
   supported in this version of IIS.  
 - The vulnerability could only be exploited if the server allowed  
   WebDAV requests to be levied on it. The IIS Lockdown Tool, if  
   deployed in its default configuration, disables such requests.  
 
Cross-site Scripting in IIS Administrative Pages:  
 - The vulnerabilities could only be exploited if the attacker  
   could entice another user into visiting a web page and clicking
   a link on it, or opening an HTML mail.  
 - By default, the pages containing the vulnerability are restricted  
   to local IP address. As a result, the vulnerability could only
   be exploited if the client itself were running IIS.
 
Aggregate Risk Rating:
============
 - Internet systems: Moderate
 - Intranet systems: Moderate
 - Client systems: Low
 
Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the  
   Security Bulletin at
   http://www.microsoft.com/technet/s [...] 02-062.asp
   for information on obtaining this patch.
 
Acknowledgment:
===============
 - Li0n of A3 Security Consulting Co., Ltd. (http://www.a3sc.co.kr)
   for reporting the Out of process privilege elevation  
   vulnerability.  
 - Mark Litchfield of Next Generation Security Software Ltd.  
   (http://www.nextgenss.com) for reporting the WebDAV denial  
   of service vulnerability.  
 - Luciano Martins of Deloitte & Touche Argentina  
   (http://www.deloitte.com.ar) for recommending the change in the
   socket backlog list purge rate.
 
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PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE  
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS  
BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT,
INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR  
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Je l'ai recu aussi, mais merci du geste..  

Merci bcp !!!  

moi aussi reçu

Merci et UP pour que les autres en profite aussi
 
:jap: