Re: Re: [WEB SECURITY] Universal XSS with PDF files: highly dangerous

[rudeyak () yahoo com]

YMMV, but in our own testing of server-side defenses for Apache, we had to resort to the following to extract the 
anchor information:

# mod_rewrite defense
RewriteCond %{THE_REQUEST} .*\.pdf[^A-Za-z0-9._?&%-]
RewriteRule (.*\.(pdf)) $1 [R,L]

# mod_security defense 
SecRule REQUEST_URI_RAW: ".*\.pdf[^A-Za-z0-9._?&%-]" \
        "deny,log,status:502,id:951004,severity:2,msg:'DOM attack on static content'"

In the case of mod_rewrite, I had to use THE_REQUEST, which captures the entire 1st line of an HTTP request, not just 
the URI (hence capturing the anchor); in the case of mod_security, I think I just got lucky, I can't explain why 
REQUEST_URI_RAW worked while REQUEST_URI did not.  This was tested with Apache 2.0.59 and modsecurity-apache_2.0.4.