Edit File: shellshock_detect.lua
--[[ Copyright (C) 2013-2018 Draios Inc dba Sysdig. This file is part of sysdig. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --]] -- Chisel description description = "Reports every attempt to execute bash in a way that exploits the shellshock vulnerability (http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2014-6271). For every attempt, the chisel reports the time, the name of the process trying to run bash, and its PID."; short_description = "print shellshock attacks"; category = "Security"; args = {} require "common" -- Initialization callback function on_init() -- Request the fields that we need fpname = chisel.request_field("proc.pname") fppid = chisel.request_field("proc.ppid") fpid = chisel.request_field("proc.pid") fenv = chisel.request_field("evt.arg.environment") fetime = chisel.request_field("evt.time") -- set the filter chisel.set_filter("proc.name=bash or proc.name=sh and evt.type=execve") print(extend_string("TIME", 22) .. extend_string("PROCNAME", 22) .. extend_string("PID", 8) .. "FUNCTION") return true end -- Event parsing callback function on_event() local env = evt.field(fenv) local pname = evt.field(fpname) local etime = evt.field(fetime) local ppid = evt.field(fppid) if env ~= nil then if string.find(env, "%(%) ?{.+") then local pid = evt.field(fpid) local env_list = sysdig.get_thread_table(filter)[pid].env for i, v in ipairs(env_list) do if string.find(v, "%(%) ?{.+") then local command = string.match(v, "%(%).+") print(extend_string(etime, 22) .. extend_string(pname, 22) .. extend_string(tostring(ppid), 8) .. command) break end end end end return true end