Inproper UTF8 encoding lead to forbidden in apache by ModSecurity2

Today a very interesting issue raised…

Scenario:

1. Copy text from Word document
2. Paste text to input text field in browser
3. Submit the form
4. Response from apache is the following:
   Bad Request
Your browser sent a request that this server could not understand.

Reason:

UTF8 text from word document conflicts with ModSecurity2′s rule – 950801

Solution:

Add the following line into proper place in httpd.conf
SecRuleRemoveById 950801
Reference:

http://en.wikipedia.org/wiki/Percent_encoding#Binary_data

http://www.modsecurity.org/documentation/modsecurity-apache/2.5.9/modsecurity2-apache-reference.html#N10A8B

http://osdir.com/ml/apache.mod-security.user/2007-05/msg00179.html