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chfeedback.txt

chfeedback.txt
Posted Sep 7, 2005
Authored by deathtrip

The Perl Feedback Form CGI script (chfeedback.pl) lacks variable sanitizing and allows for CRLF injection, enabling addition of email fields.

tags | advisory, cgi, perl
SHA-256 | ba0e2e8aa5b9b43e47fa4c87827fc0d62e1ff23f8d229fe2547644e85631c78b

chfeedback.txt

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The "Perl Feedback Form CGI Script" (chfeedback.pl) located at
http://www.thesitewizard.com/wizards/feedbackform.shtml prior to
10/05/2005 lacked variable sanitization, and as such allowed for CRLF
injection. This allowed anyone to add email fields (such as Bcc:) via
a crafted URL, and send gobs of spam as a result. I notified the
vendor yesterday, and although I haven't received any response yet
(nor would I expect to in such a short amount of time), I noticed that
the script has been updated with proper sanitization.

Old version: chfeedback.pl Feedback Form Perl Script Ver 2.01
New version: chfeedback.pl Feedback Form Perl Script Ver 2.2.1

No proof of concept - I don't support giving spammers any more
information than this.

If you have users using this form, you can add the following 2 lines
to the send_email() subroutine just before the line:

if (open MAIL, "|$mailprog -t") {


Update with this:

$name =~ s/[\r\n].*//s;
$email =~ s/[\r\n].*//s;
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