# Copyright 2001-2019 Sourcefire, Inc. All Rights Reserved.
#
# This file contains (i) proprietary rules that were created, tested and certified by
# Sourcefire, Inc. (the "VRT Certified Rules") that are distributed under the VRT
# Certified Rules License Agreement (v 2.0), and (ii) rules that were created by
# Sourcefire and other third parties (the "GPL Rules") that are distributed under the
# GNU General Public License (GPL), v2.
# 
# The VRT Certified Rules are owned by Sourcefire, Inc. The GPL Rules were created
# by Sourcefire and other third parties. The GPL Rules created by Sourcefire are
# owned by Sourcefire, Inc., and the GPL Rules not created by Sourcefire are owned by
# their respective creators. Please see http://www.snort.org/snort/snort-team/ for a
# list of third party owners and their respective copyrights.
# 
# In order to determine what rules are VRT Certified Rules or GPL Rules, please refer
# to the VRT Certified Rules License Agreement (v2.0).
#
#-----------
# X11 RULES
#-----------

# alert udp $EXTERNAL_NET any -> $HOME_NET 177 (msg:"X11 xdmcp query"; flow:to_server; content:"|00 01 00 03 00 01 00|"; fast_pattern:only; metadata:ruleset community; classtype:attempted-recon; sid:517; rev:7;)
# alert udp $EXTERNAL_NET any -> $HOME_NET 177 (msg:"X11 xdmcp info query"; flow:to_server; content:"|00 01 00 02 00 01 00|"; fast_pattern:only; metadata:ruleset community; reference:nessus,10891; classtype:attempted-recon; sid:1867; rev:6;)
# alert tcp $EXTERNAL_NET any -> $HOME_NET 6000 (msg:"X11 MIT Magic Cookie detected"; flow:established; content:"MIT-MAGIC-COOKIE-1"; fast_pattern:only; metadata:ruleset community; classtype:attempted-user; sid:1225; rev:11;)
# alert tcp $EXTERNAL_NET any -> $HOME_NET 6000 (msg:"X11 xopen"; flow:established; content:"l|00 0B 00 00 00 00 00 00 00 00 00|"; fast_pattern:only; metadata:policy max-detect-ips drop, ruleset community; classtype:unknown; sid:1226; rev:14;)