#alert http $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"HTTP/1.1 404 Not Found|0d 0a|"; depth:24; nocase; content:"<script"; nocase; within:512; reference:url,doc.emergingthreats.net/2010518; classtype:web-application-attack; sid:2010518; rev:4; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, deployment Perimeter, tag Web_Client_Attacks, signature_severity Major, created_at 2010_07_30, updated_at 2016_07_01;)

Added 2017-08-07 21:03:38 UTC


#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"404"; http_stat_code; content:"Not Found"; nocase; file_data; content:"<script"; nocase; distance:0; reference:url,doc.emergingthreats.net/2010518; classtype:web-application-attack; sid:2010518; rev:8;)

Added 2011-10-12 19:29:57 UTC


#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"404"; http_stat_code; content:"Not Found"; nocase; file_data; content:"<script"; nocase; distance:0; classtype:web-application-attack; reference:url,doc.emergingthreats.net/2010518; sid:2010518; rev:8;)

Added 2011-09-14 22:43:09 UTC


#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"404"; http_stat_code; content:"Not Found"; nocase; file_data; content:"<script"; nocase; distance:0; classtype:web-application-attack; reference:url,doc.emergingthreats.net/2010518; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/WEB_CLIENT/WEB_Error_XSS; sid:2010518; rev:8;)

Added 2011-04-26 18:47:16 UTC


#alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"404"; http_stat_code; content:"Not Found"; nocase; http_stat_msg; file_data; content:"<script"; nocase; distance:0; classtype:web-application-attack; reference:url,doc.emergingthreats.net/2010518; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/WEB_CLIENT/WEB_Error_XSS; sid:2010518; rev:6;)

Added 2011-02-04 17:30:05 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"HTTP/1.1 404 Not Found|0d 0a|"; depth:24; nocase; content:"<script"; nocase; within:512; classtype:web-application-attack; reference:url,doc.emergingthreats.net/2010518; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/WEB_CLIENT/WEB_Error_XSS; sid:2010518; rev:3;)

Added 2010-06-09 20:41:08 UTC

I've seen legitimate 404 errors from websites trigger this alert.

-- ShawnJefferson - 22 Jul 2010


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"HTTP/1.1 404 Not Found|0d 0a|"; depth:24; nocase; content:"<script"; nocase; within:512; classtype:web-application-attack; reference:url,doc.emergingthreats.net/2010518; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/WEB_CLIENT/WEB_Error_XSS; sid:2010518; rev:3;)

Added 2010-06-09 20:41:08 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET 1024: (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"HTTP/1.1 404 Not Found|0d 0a|"; depth:24; nocase; content:"<script"; nocase; within:512; classtype:web-application-attack; reference:url,doc.emergingthreats.net/2010518; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/WEB_CLIENT/WEB_Error_XSS; sid:2010518; rev:2;)

Added 2009-12-21 10:30:44 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET 1024: (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"HTTP/1.1 404 Not Found|0d 0a|"; depth:24; nocase; content:"<script"; nocase; within:512; classtype:web-application-attack; reference:url,doc.emergingthreats.net/2010518; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/WEB_CLIENT/WEB_Error_XSS; sid:2010518; rev:2;)

Added 2009-12-21 10:30:44 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET 1024: (msg:"ET WEB_CLIENT Possible HTTP 404 XSS Attempt (External Source)"; flow:from_server,established; content:"HTTP/1.1 404 Not Found|0d 0a|"; depth:24; nocase; content:"<script"; nocase; within:512; classtype:web-application-attack; sid:2010518; rev:1;)

Added 2009-12-20 22:53:23 UTC


Topic revision: r2 - 2010-07-22 - ShawnJefferson
 
This site is powered by the TWiki collaboration platform Powered by Perl This site is powered by the TWiki collaboration platformCopyright © Emerging Threats