File: web-client.rules

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# (C) Copyright 2001-2004, Martin Roesch, Brian Caswell, et al.
#    All rights reserved.
# $Id: web-client.rules,v 1.20.2.6 2005/03/01 18:57:08 bmc Exp $
#---------------
# WEB-CLIENT RULES
#---------------
#
# These signatures look for two things:
# * bad things coming from our users
# * attacks against our web users

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"WEB-CLIENT Outlook EML access"; flow:from_client,established; uricontent:".eml"; reference:nessus,10767; classtype:attempted-user; sid:1233; rev:11;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"WEB-CLIENT Microsoft emf metafile access"; flow:from_client,established; uricontent:".emf"; reference:bugtraq,10120; reference:bugtraq,9707; reference:cve,2003-0906; classtype:attempted-user; sid:2435; rev:4;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"WEB-CLIENT Microsoft wmf metafile access"; flow:from_client,established; uricontent:".wmf"; reference:bugtraq,10120; reference:bugtraq,9707; reference:cve,2003-0906; classtype:attempted-user; sid:2436; rev:4;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT XMLHttpRequest attempt"; flow:to_client,established; content:"new XMLHttpRequest|28|"; content:"file|3A|//"; nocase; reference:bugtraq,4628; reference:cve,2002-0354; classtype:web-application-attack; sid:1735; rev:7;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"WEB-CLIENT readme.eml download attempt"; flow:from_client,established; uricontent:"/readme.eml"; nocase; reference:url,www.cert.org/advisories/CA-2001-26.html; classtype:attempted-user; sid:1284; rev:10;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT readme.eml autoload attempt"; flow:to_client,established; content:"window.open|28 22|readme.eml|22|"; nocase; reference:url,www.cert.org/advisories/CA-2001-26.html; classtype:attempted-user; sid:1290; rev:10;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT Javascript document.domain attempt"; flow:to_client,established; content:"document.domain|28|"; nocase; reference:bugtraq,5346; reference:cve,2002-0815; classtype:attempted-user; sid:1840; rev:7;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT Javascript URL host spoofing attempt"; flow:to_client,established; content:"javascript|3A|//"; nocase; reference:bugtraq,5293; classtype:attempted-user; sid:1841; rev:5;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT RealPlayer arbitrary javascript command attempt"; flow:to_client,established; content:"Content-Type|3A|"; nocase; pcre:"/^Content-Type\x3a\s*application\x2fsmi.*?<area[\s\n\r]+href=[\x22\x27]file\x3ajavascript\x3a/smi"; reference:bugtraq,8453; reference:bugtraq,9378; reference:cve,2003-0726; classtype:attempted-user; sid:2437; rev:7;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT RealPlayer playlist file URL overflow attempt"; flow:from_server,established; flowbits:isset,realplayer.playlist; content:"file|3A|//"; nocase; pcre:"/^file\x3a\x2f\x2f[^\n]{400}/smi"; reference:bugtraq,9579; reference:cve,2004-0258; classtype:attempted-user; sid:2438; rev:5;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT RealPlayer playlist http URL overflow attempt"; flow:from_server,established; flowbits:isset,realplayer.playlist; content:"http|3A|//"; nocase; pcre:"/^http\x3a\x2f\x2f[^\n]{400}/smi"; reference:bugtraq,9579; reference:cve,2004-0258; classtype:attempted-user; sid:2439; rev:5;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT RealPlayer playlist rtsp URL overflow attempt"; flow:from_server,established; flowbits:isset,realplayer.playlist; content:"rtsp|3A|//"; nocase; pcre:"/^http\x3a\x2f\x2f[^\n]{400}/smi"; reference:bugtraq,9579; reference:cve,2004-0258; classtype:attempted-user; sid:2440; rev:5;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT Nortan antivirus sysmspam.dll load attempt"; flow:to_client,established; content:"clsid|3A|"; nocase; content:"0534CF61-83C5-4765-B19B-45F7A4E135D0"; nocase; reference:bugtraq,9916; reference:cve,2004-0363; classtype:attempted-admin; sid:2485; rev:4;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT local resource redirection attempt"; flow:to_client,established; content:"Location|3A|"; nocase; pcre:"/^Location\x3a\s*URL\s*\x3a/smi"; reference:cve,2004-0549; reference:url,www.kb.cert.org/vuls/id/713878; classtype:attempted-user; sid:2577; rev:3;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT Content-Disposition CLSID command attempt"; flow:to_client,established; content:"Content-Disposition|3A|"; nocase; pcre:"/^Content-Disposition\x3a[^\r\n]*\{[\da-fA-F]{8}(-[\da-fA-F]{4}){3}-[\da-fA-F]{12}\}/smi"; reference:bugtraq,9510; reference:cve,2004-0420; reference:url,www.microsoft.com/technet/security/bulletin/ms04-024.mspx; classtype:attempted-user; sid:2589; rev:3;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT libpng tRNS overflow attempt"; flow:to_client,established; content:"|89|PNG|0D 0A 1A 0A|"; content:"IHDR"; within:4; distance:4; content:"tRNS"; distance:0; byte_test:4,>,256,-8,relative,big; pcre:"/IHDR(?!.*?PLTE).*?tRNS/s"; reference:bugtraq,10872; reference:cve,2004-0597; classtype:attempted-user; sid:2673; rev:4;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT bitmap BitmapOffset integer overflow attempt"; flow:to_client,established; content:"image/bmp"; nocase; pcre:"/^Content-type\x3a\s*image\x2fbmp/smi"; pcre:"/^BM/sm"; byte_test:4,>,2147480000,8,relative,little; reference:bugtraq,9663; reference:cve,2004-0566; classtype:attempted-user; sid:2671; rev:4;)
# alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT JPEG parser heap overflow attempt"; flow:from_server,established; content:"image/"; nocase; pcre:"/^Content-Type\s*\x3a\s*image\x2fp?jpe?g.*\xFF\xD8.{2}.*\xFF[\xE1\xE2\xED\xFE]\x00[\x00\x01]/smi"; reference:bugtraq,11173; reference:cve,2004-0200; reference:url,www.microsoft.com/security/bulletins/200409_jpeg.mspx; classtype:attempted-admin; sid:2705; rev:4;)
# alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT JPEG transfer"; flow:from_server,established; content:"image/"; nocase; pcre:"/^Content-Type\s*\x3a\s*image\x2fp?jpe?g/smi"; flowbits:set,http.jpeg; flowbits:noalert; classtype:protocol-command-decode; sid:2706; rev:2;)
# alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT JPEG parser multipacket heap overflow"; flow:from_server,established; flowbits:isset,http.jpeg; content:"|FF|"; pcre:"/\xFF[\xE1\xE2\xED\xFE]\x00[\x00\x01]/"; reference:bugtraq,11173; reference:cve,2004-0200; reference:url,www.microsoft.com/security/bulletins/200409_jpeg.mspx; classtype:attempted-admin; sid:2707; rev:2;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT Microsoft ANI file parsing overflow"; flow:established,from_server; content:"RIFF"; nocase; content:"anih"; nocase; byte_test:4,>,36,0,relative,little; reference:cve,CAN-2004-1049; classtype:attempted-user; sid:3079; rev:2;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT winamp .cda file name overflow attempt"; flow:from_server,established; content:".cda"; nocase; pcre:"/(\x5c[^\x5c]{16,}|\x2f[^\x2f]{16,})\.cda$/smi"; reference:bugtraq,11730; classtype:attempted-user; sid:3088; rev:1;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT PNG large image width download attempt"; flow:from_server,established; content:"|89|PNG|0D 0A 1A 0A|"; content:"IHDR"; within:8; byte_test:4,>,32768,0,relative; reference:cve,2004-0990; reference:cve,2004-1244; reference:url,www.microsoft.com/technet/security/bulletin/MS05-009.mspx; reference:bugtraq,11523; classtype:attempted-user; sid:3132; rev:2;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT PNG large colour depth download attempt"; flow:from_server,established; content:"|89|PNG|0D 0A 1A 0A|"; content:"IHDR"; within:8; byte_test:1,>,16,8,relative; reference:cve,2004-0990; reference:cve,2004-1244; reference:url,www.microsoft.com/technet/security/bulletin/MS05-009.mspx; reference:bugtraq,11523; classtype:attempted-user; sid:3134; rev:2;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT PNG large image height download attempt"; flow:from_server,established; content:"|89|PNG|0 D 0A 1A 0A|"; content:"IHDR"; within:8; byte_test:4,>,32768,4,relative; reference:cve,2004-0990; reference:cve,2004-1244; reference:url,www.microsoft.com/technet/security/bulletin/MS05-009.mspx; reference:bugtraq,11481; reference:cve,2004-0599; reference:bugtraq,11523; classtype:attempted-user; sid:3133; rev:3;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT object type overflow attempt"; flow:from_server,established; content:"<OBJECT"; nocase; pcre:"/<OBJECT\s+[^>]*type\s*=[\x22\x27]\x2f{32}/smi"; reference:cve,2003-0344; classtype:attempted-user; sid:3149; rev:2;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT Windows Media Player directory traversal via Content-Disposition attempt"; flow:from_server,established; content:"Content-Disposition|3A|"; nocase; pcre:"/filename=[^\x3b\x3a\r\n]*(\x2e\x2e|\x25\x32\x65)/smi"; reference:cve,2003-0228; classtype:attempted-user; sid:3192; rev:1;)
alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"WEB-CLIENT winhelp clsid attempt"; flow:from_server,established; content:"adb880a6-d8ff-11cf-9377-00aa003b7a11"; nocase; pcre:"/<OBJECT\s+[^>]*classid\s*=\s*clsid\s*\x3a\s*adb880a6-d8ff-11cf-9377-00aa003b7a11/si"; reference:url,www.ngssoftware.com/advisories/ms-winhlp.txt; reference:bugtraq,4857; reference:cve,2002-0823; classtype:attempted-user; sid:3148; rev:2;)