[Snort-sigs] Does HTML always escape?

Derek Edwards derekedw at ...144...
Wed Apr 21 08:02:08 EDT 2004


Hello,
 
I've been away from the list for a while, so please bear with me if I've missed something important.  Given this signature installed in Snort 1.9 to detect an attempt to misuse MHTML in an HTML document:
 
alert tcp any any -> $HOME_NET any (msg:"MTHML URL Attempt"; flow:from_server,established; content:"ms-its|3A|mhtml|3A|"; nocase; reference:cve,CAN-2004-0380; classtype:web-application-attack; sid:1000019; rev:4; )
 
The HTML snippet below brings up a general question.  Is there any way to detect this kind of HTML, given the way the leading 'm' character is escaped?  
 
<object data="ms-its:mhtml:file://C:\foo.mht!${PATH}/junk.chm::/stuff.htm" type="text/x-scriptlet"></object>

The difficulty in supporting the variety of encodings used is covered in a recent "incidents-list" thread at:  http://archives.neohapsis.com/archives/incidents/2004-04/0014.html
 
Thank you,


--  
  Derek Edwards, CISSP/CEH                     derekedw at ...144...
                         Soli Deo Gloria

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