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From "Shapira, Yoav" <>
Subject RE: single percent sign in a parameter causes an exception report detailing tomcat version
Date Fri, 16 Apr 2004 12:52:55 GMT

Thanks for providing some amusement on my Friday morning ;)

This is not a known issue because it's not an issue.  Knowing tomcat's
version number won't help you because there are no version-specific
tomcat security holes.  Furthermore, all of tomcat's built-in error
pages have the exact version, i.e. even mishaps like 404's give the same
result as your test.  So this is not special to the % parameter either.

Yoav Shapira
Millennium Research Informatics

>-----Original Message-----
>From: David Cassidy []
>Sent: Friday, April 16, 2004 6:10 AM
>To: Tomcat Developers List
>Subject: single percent sign in a parameter causes an exception report
>detailing tomcat version
>We've had a pen test done on one of the apps we look after and they an
>issue which I'd
>like a little guidance on ...
>(Accept that these guys are specifically sending iffy requests to cause
>system to break or detail
>what versions of the code is being used to provide ways of hacking in
>If you have a page that does
>and you specify
>The result is an exception report that details what version of tomcat
>are running
>(I've tried this with 4.1.29 and it does make a wonderful exception
>Anyone seen this before ?
>Anyone got a fix ?
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