alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN Apache mod_deflate DoS via many multiple byte Range values"; flow:established,to_server; content:"Range|3a|"; nocase; content:"bytes="; nocase; distance:0; isdataat:10,relative; content:","; within:11; isdataat:10,relative; content:","; within:11; isdataat:10,relative; content:","; within:11; isdataat:70,relative; content:!"|0d 0a|"; within:12; pcre:"/Range\x3a\s?bytes=[-0-9,\x20]{100}/iH"; reference:url,seclists.org/fulldisclosure/2011/Aug/175; classtype:attempted-dos; sid:2013473; rev:6; metadata:created_at 2011_08_26, deprecation_reason Relevance, performance_impact Significant, confidence Medium, signature_severity Informational, updated_at 2024_04_09;)