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WIN :[Fwd: Alert: RE: IIS DoS]



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In short, people can bring down IIS web servers, unless the fix
described in the attachments is applied.

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Received: from mail.rc.on.ca by nis.acs.uci.edu (8.8.5) id HAA28343; Sat, 21 Jun 1997 07:13:18 -0700 (PDT)
Message-Id: <199706211413.HAA28343@nis.acs.uci.edu>
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	id NB152PZP; Sat, 21 Jun 1997 09:36:47 -0400
Date:         Sat, 21 Jun 1997 02:01:47 -0400
Reply-To: Russ <Russ.Cooper@rc.on.ca>
Sender: Windows NT BugTraq Mailing List <NTBUGTRAQ@rc.on.ca>
From: Russ <Russ.Cooper@rc.on.ca>
Subject:      Alert: RE: IIS DoS
Comments: To: Erich Siedler <erich.siedler@OMNINET.COM.BR>
To: NTBUGTRAQ@RC.ON.CA
X-Status: 
X-Keywords:
X-UID: 26

IIS on NT 4.0 (the version seems not to matter) can be crashed with a
URL of specific but long length (4k - 8k, variable per server). Erich
Siedler sent out the URLs for stories  about this bug (Alert members can
see the message in the archives, http://ntbugtraq.rc.on.ca/archives)

This exploit/bug has been fixed with a Hot Fix now available on the MS
FTP site. The location is;

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixe
s-postSP3/iis-fix

Fixes seem only available for USA versions for Intel and Alpha. I
haven't yet been able to determine what files are actually updated in
the Hot Fix since it executes far too quickly and I haven't tried it
with auditing turned on yet. I couldn't find any updated files in the
INETSRV directory.

**** WARNING!! When you run the Hot Fix it will reboot your machine
without asking!!! ****

KB article Q143484 is woefully bereft of any useful information about
the bug, see Todd Fast's site for the only descriptive information about
it;

http://www.eden.com/~tfast/jihad.html

Cheers,
Russ
R.C. Consulting, Inc. - NT/Internet Security
owner of the NTBugTraq mailing list:
http://ntbugtraq.rc.on.ca/index.html


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Content-Base: "ftp://ftp.microsoft.com/bussys/winnt/w
	innt-public/fixes/usa/nt40/hotfixes
	-postSP3/iis-fix/"

<BASE HREF="ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix/";>

<TITLE>Directory of /bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix</TITLE>
 <H2>Current directory is /bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix</H2>
 <PRE><HR>This is FTP.MICROSOFT.COM.  Please see the
 dirmap.txt file for more information.
  
 An alternate location for Windows NT 
 Service Packs is located at: 
  
 <A HREF="ftp://198.105.232.37/fixes/";>ftp://198.105.232.37/fixes/</A>
<HR><A HREF="/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/">Up to higher level directory</A><BR> <A HREF="/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix/Q143484.txt"><IMG ALIGN=absbottom BORDER=0 SRC="internal-gopher-text"> Q143484.txt</A>           2 Kb    Mon Jun 23 16:34:00 1997 Plain Text
 <A HREF="/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix/iis-fixa.exe"><IMG ALIGN=absbottom BORDER=0 SRC="internal-gopher-binary"> iis-fixa.exe</A>        195 Kb    Fri Jun 20 22:06:00 1997 Binary Executable
 <A HREF="/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix/iis-fixi.exe"><IMG ALIGN=absbottom BORDER=0 SRC="internal-gopher-binary"> iis-fixi.exe</A>        161 Kb    Fri Jun 20 22:06:00 1997 Binary Executable
 <A HREF="/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix/readme.txt"><IMG ALIGN=absbottom BORDER=0 SRC="internal-gopher-text"> readme.txt</A>          576 bytes Fri Jun 20 23:50:00 1997 Plain Text

</PRE>
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<font size=+2 face="Arial", "Helvetica"><STRONG>Microsoft patches bug</STRONG></font>
<br>

        
<font size=-1 face="Arial", "Helvetica">
By <a href="mailto:janetk@cnet.com";>
			Janet Kornblum</a><BR>





	June 21, 1997, 5:45 a.m. PT
</font>


    <p>

   





 
<font face="Arial, Helvetica" size="-1" color="#cc0000"><strong>update</strong></font>

<a href="http://www.microsoft.com/";>Microsoft</a> <a href="http://www.dbc.com/cgi-bin/htx.exe/squote?source=blq/cnet&ticker=MSFT";>(MSFT)</a> has apparently fixed a bug in its server software that had been exploited by hackers to cut off access to the company's Web site.
<p>
The software giant posted a <a href="ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/hotfixes-postSP3/iis-fix/";>patch</a> for the hole that Netizens could download. Microsoft also provided a detailed <a href="http://www.microsoft.com/misc/upgrademessage2.htm";>explanation</a> of the hacking, labeled a "denial of service" attack, which had jammed its site since Thursday.
<p>
"Two issues combined Friday to cause problems for customers
attempting to access our site. One was the scheduled upgrading
of our system; another was a hacker's attack," Microsoft said on its home page, which was accessible this morning. "Read about the upgrade and how we've created a fix for a bug used by the hacker."
<p>
The incident, <a href="/News/Item/0,4,11759,00.html">reported yesterday</a> by CNET's NEWS.COM, quickly became a high-profile embarrassment for the world's largest software maker. Microsoft's site is one of the most popular on the Web, drawing millions of hits a day.
<p>
Hackers apparently took advantage of a bug in Windows NT 4.0 running Microsoft's Internet Information Server 3.0, in which the entire site was jammed by people typing a specific URL into their Web browsers repeatedly, according to Mike Nash, director of marketing for Windows NT server.
<p>
Hackers sent Microsoft an email at about 4 p.m. Thursday, Nash said. Engineers immediately developed a patch and posted it late Friday night. 
<p>
"Hackers made us aware of a problem that they had identified," Nash said. "It is possible to develop a URL--a string of characters in a browser--that could cause interruption of service on a Web server." (The site remained available through an <a href="http://207.68.137.55";>alternative IP address</a>.)
<p>
Someone identified as Todd Fast says on his site that he inadvertently discovered the bug "while examining the parameters of an URL Microsoft's Internet Information Server (IIS) would accept without an error."
<p>
"This is a hugely embarrassing bug for Microsoft, in my opinion,
particularly since they've just been lauded for pulling ahead of <a href="http://www.netscape.com/";>Netscape</a> in the Web server market," Fast wrote. "Knowing that anyone with a grudge and a twitchy keyboard could shut down any of their customer's Web sites must bear horribly on their collective conscience."
<p>
Company representatives originally said that the problem was caused by busy servers and that users should expect delays through the end of the month.
<p>
The problem was exacerbated by what Microsoft spokesman Adam Sohn called "phenomenal growth."
<p>
In other words, not everyone who tries to access the site will get onto it every time. The problem is compounded by Internet routing jams and individual jams at Internet service providers, Nash said.
<p>
The relative few who were able to get to the home page yesterday were greeted with the following message: "We're upgrading; our apologies in advance due to growth...Over the next few weeks, some users may see some interruption in service. Read what's happening!"
<p>
The "Read what's happening" had a link, presumably to a story, but people had trouble getting to that link.
<p>
The outage and problems have angered some Web surfers who have been trying to get onto the pages. Some, who presumably did not yet know the cause of the outage, used the problems to criticize the company's Web server software. "Maybe they should have bought <a href="http://www.linux.org/";>Linux</a>," one reader sarcastically wrote to NEWS.COM.<p>
<p>
"They have so many bugs in their software, so why use it?" asked  Ben Efros, a Webmaster who also wrote in. "Microsoft is just a large company going nowhere on the Internet."
<p>
But others came to the defense of Microsoft, saying that despite the bug, its server software was superior to others.
<p>
<p>


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