Re: IDS and Unicode

From: Kevin J. Menard, Jr. (kmenardat_private)
Date: Tue May 29 2001 - 07:08:31 PDT

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    Hey Parth,
    
    
    Monday, May 28, 2001, 1:10:04 PM, you wrote:
    
    PG> Recently I was pentesting a site and was noticed by a very good admin's homegrown IDS. His IDS was some batch files that keyed on ".exe" in the IIS logs. I have something similiar on my sites,
    PG> using Snort and scanning the IIS logs.
    
    PG> So, I was thinking, could someone give me the Unicoded encoded string for "cmd.exe"? Then when pentesting sites like this (using a browser, .pl, or nc based call to the Unicode or Filename Double
    PG> Decode exploits) I can also test their IDS. I would then recommend that they key on "%" when not followed by "20", since a "%" sign would be suspicious when not used to encode a space.
    
    Not true.  I work with many URLs that use %3A for example.  There are
    legitimate reasons to use % other than in %20, and what you're
    suggesting would block out a lot of URLs.  (In my case, the ":" is
    used in a CGI bug script submission -- blocking this would not be a
    good idea).
    
    PG> Thanks for your time and effort! Any feedback would be much appreciated! 
    
    PG> Parth
    
    -- Kevin
    



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