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Re: protecting against exploiting mail forms



Marek Podmaka wrote:
Hello Luc,

Saturday, November 19, 2005, 19:32:47, Luc Stroobant wrote:

LS> SecFilter "To\:"
LS> SecFilter "to\:"
LS> SecFilter "From\:"
LS> SecFilter "from\:"
LS> SecFilter "Cc\:"
LS> SecFilter "cc\:"
LS> SecFilter "Bcc\:"
LS> SecFilter "bcc\:"

  These break a lot other scripts (including webmail). It matches for
  example text "mailto:something"; and many other. I have modified it
  by prepending "\n" to each of this and for now it seems ok.

Webmail will be a problem with these rules, indeed. In our case, users are not supposed to host such apps. I guess when somebody tries to post a mailheader on a forum you'll run in troubles with your rules too...

  But I had to enable SecFilterScanPOST and it breaks some more
  things... Do you know what this error means?

Error: chunked Transfer-Encoding forbidden: /chat/f_upload.php
mod_security-message: Access denied with code 500. ap_setup_client_block failed with 411

Probably this one:
<http://www.modsecurity.org/documentation/modsecurity-apache-manual-1.9.html#N101B4>

Luc



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