alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT MS13-055 CAnchorElement Use-After-Free"; flow:established,from_server; file_data; content:".outer"; fast_pattern; pcre:"/^(?:Text|HTML)[\r\n\s]*?=[\r\n\s]*?(?:\x22\x22|\x27\x27)/Ri"; content:".getElementById("; nocase; content:"<span"; nocase; content:"on"; pcre:"/^(?:(?:(?:s(?:elec|ubmi)|rese)t|d(?:blclick|ragdrop)|(?:mouse|key)[a-z]|c(?:hange|lick)|(?:un)?load|focus|blur)|s(?:cript|tyle=))/Ri"; content:"<table"; nocase; pcre:"/^((?!<table>).)+?<tr[\r\n\s\>]((?!<\/tr>).)*?<span[\r\n\s\>]((?!<\/span>).)*?<(?:[QU]|S(?:TR(?:IKE|ONG)|U[BP]|MALL|AMP)?|B(?:LINK|DO|IG)?|A(?:CRONYM|BBR)|R(?:[PT]|UBY)|(?:NOB|VA)R|C(?:IT|OD)E|D(?:EL|FN)|I(?:NS)?|KBD|EM|TT)[^>]*?\bid[\r\n\s]*?=/Rsi"; classtype:attempted-user; sid:2017463; rev:3; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2013_09_13, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;)