RE: Another IE denial of service attack

From: Timothy Luce (tluce@PTI-Pump.com)
Date: Thu Dec 06 2001 - 09:48:41 PST

  • Next message: Simon Kornblith: "Re: IE Denial of service (sorta)"

    This appears to be a Java VM issue plus a little MS bonus.
    Very interesting that even with Java DISABLED - IE still hangs!
    Netscape runs fine with Java DISABLED - dies quickly with it enabled.
    
    NT Version 4.0 (Build 1381: Service Pack 6)
    IE Version	5.50 (Build 4807.2300) Updates SP2; Q306121;
    	MS JAVA VM 5.0.3802.0
    Netscape 4.73 w/ Netscape Java Interpreter 4.73.0.5 (jrt3240.dll)
    CPU 1	GenuineIntel x86 Family 6 Model 8 Stepping 6 ~993 Mhz
    CPU 2	GenuineIntel x86 Family 6 Model 8 Stepping 6 ~993 Mhz
    Total Physical Memory	1047596 KB
    Available Physical Memory	16016 KB
    Page File Usage	0%
    Total Virtual Memory	2097024 KB
    
    Netscape 4.73 (w/java & javascript DE-ACTIVATED):
    	Page Loads form in ~5 seconds; empty text entry box -- no issue
    
    Netscape 4.73 (w/java & javascript ACTIVE):
    	Page load form in ~ 5 sec then takes 100% of 1 CPU (CFD running on other)
    then
    	DR Watsons in about 15 seconds with Error
    		Access violation (0xc0000005)
    
    IE 5.5.4807.2300 (Internet Zone: Java DISABLED)
    	No form loads - indicates opening secondary page
    	On secondary Page load (www.teknix.vwe.net) takes 100% of idle CPU
    	Spun wheels for 10 minutes -- until killed
    
    IE 5.5.4807.2300 (Internet Zone: Java High Security)
    	No form loads - indicates opening secondary page
    	On secondary Page load takes 100% of idle CPU
    	Spun wheels for 10 minutes -- until killed
    
    IE 5.5.4807.2300 (Internet Zone: Java Low Security)
    	No form loads - indicates opening secondary page
    	On secondary Page load takes 100% of idle CPU
    	Spun wheels for 10 minutes -- until killed
    
    
    > -----Original Message-----
    > From: Wodahs Latigid [mailto:wodahsat_private]
    > Sent: Thursday, December 06, 2001 5:16 AM
    > To: bugtraqat_private; vuln-devat_private
    > Subject: Another IE denial of service attack
    >
    >
    > Hi,
    >
    > While we're on the subject of Internet Explorer DoS attacks,
    > heres one that I found a while back. On a P800 with 512mb RAM,
    > it causes 100% CPU utilisation and hangs Internet Explorer
    > until it is killed. This is more of an annoyance than anything.
    >
    > This has been tested with IE version 4 on Windows NT, versions
    > 5.5 and 5.5sp2 on Windows 95, and version 5.00 on Windows 2000
    > with the same results.
    >
    > You can find the test page at:
    > http://www.ministryofpeace.co.uk/iehang.html
    >
    > The problem seems to occur when continuously updating a
    > simple form text box over and over. I have also found that
    > pasting a large amount of any letter into such a text box
    > will eventually crash IE - can anyone verify this?
    >
    >
    > Teknix
    > http://www.ministryofpeace.co.uk/
    >
    >
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    >
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    >
    > --
    >
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