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CVE-2012-1535.lua
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CVE-2012-1535.lua
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--[[
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
###Parsing bit is Based on swf.py from Jsunpack which is GPLv2 so we use that as well
https://code.google.com/p/jsunpack-n/source/browse/trunk/swf.py
####Example prefilter rules. Worked with Contagio .doc samples but had to set libhtp to insane settings below. Ideally we should be able to at least set flow int's from lua so we can create streaming parsers.
response-body-minimal-inspect-size: 65kb
response-body-inspect-window: 65kb
#New rules
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Adobe Flash Vuln (CVE-2012-1535 Uncompressed) "; flow:from_server,established; file_data; content:"FWS"; depth:3; luajit:CVE-2012-1535.lua; content:"kern"; fast_pattern:only; classtype:trojan-activity; sid:7016688; rev:4;)
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Adobe Flash Vuln (CVE-2012-1535 Compressed)"; flow:from_server,established; file_data; content:"CWS"; depth:3; luajit:CVE-2012-1535.lua; classtype:trojan-activity; sid:7016687; rev:4;)
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Adobe Flash Vuln (CVE-2012-1535 Uncompressed) "; flow:from_server,established; file_data; flowbits:isset,OLE.CompoundFile; content:"kern"; fast_pattern:only; content:"FWS"; luajit:CVE-2012-1535.lua; classtype:trojan-activity; sid:6688; rev:4;)
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Adobe Flash Vuln (CVE-2012-1535 Compressed)"; flow:from_server,established; file_data; flowbits:isset,OLE.CompoundFile; content:"CWS"; luajit:CVE-2012-1535.lua; classtype:trojan-activity; sid:6687; rev:4;)
#Existing rules
alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Microsoft OLE Compound File Magic Bytes Flowbit Set"; flow:to_client,established; content:"|d0 cf 11 e0 a1 b1 1a e1|"; content:!".msi"; flowbits:set,OLE.CompoundFile; flowbits:noalert; classtype:protocol-command-decode; sid:2012520; rev:6;)
###Requirements
#struct module
sudo luarocks install struct
#lua-zlib
https://github.com/brimworks/lua-zlib
###Technical Description of the Vuln
http://www.exploit-db.com/wp-content/themes/exploit/docs/21928.pdf
--]]
-- CVE-2012-1535 --
local lz = require 'zlib'
local s = require 'struct'
local bit = require("bit")
function init (args)
local needs = {}
needs["http.response_body"] = tostring(true)
return needs
end
function match(args)
local t = tostring(args["http.response_body"])
-- CWS and FWS are both 3 bytes long
-- Method should work for Flash inside of OLE etc.
local o = args["offset"]
t = string.sub(t,o - 3)
local tlen = string.len(t)
--Parse the SWF Header
local sig = string.sub(t,1, 3)
local ver = string.byte(t,4)
local len = s.unpack("<I4",string.sub(t,5,8))
--subtract sig,ver,len
local parsed_len = (len - 8)
-- store uncompressed length
local uncompressed_len = 0
if sig == "CWS" then
stream = lz.inflate()
t, eof, bytes_in, uncompressed_len = stream(string.sub(t,9))
if string.find(t,"kern",9,true) == nil then
return 0
end
elseif sig ~= "FWS" then
print("Not a SWF file bailing" .. sig)
return 0
end
local offset = 9
--get number of bits in the rect
local rectbits = bit.rshift(string.byte(t,9),3)
if ((rectbits * 4) % 8) == 0 then
more = rectbits * 4 / 8
else
more = math.floor(rectbits * 4 / 8) + 1
end
offset = offset + more + 1
offset = offset + 4
--iterate over the tags---
while offset + 1 < len do
b = string.byte(t,offset)
a = string.byte(t,offset + 1)
-- Out of bytes
if a == nil or b == nil then
--print("out of bytes " .. a,b)
return 0
end
-- get tag bits --
offset = offset + 2
tagtype = bit.band(((bit.lshift(a,2)) + (bit.rshift(b,6))),0x03ff)
shortlen = bit.band(b,0x3f)
-- is this a long tag format?
if shortlen == 0x3f then
shortlen = s.unpack("<I4",string.sub(t,offset,offset+4))
offset = offset + 4
end
if tagtype == 91 then
ttfoffset = offset + 3
-- Find the end of the font name
ttfoffset = string.find(t,'\000',ttfoffset,true) + 1
--print(ttfoffset)
ttf = string.sub(t,ttfoffset, ttfoffset + shortlen)
ktag = string.find(ttf,'kern',12,true)
if ktag ~= nil then
-- Inside TTF we are big endian
ktoffset = s.unpack(">I4",string.sub(ttf,ktag + 8, ktag + 11))
--print(ktoffset .. " " .. shortlen)
--make sure this is the type we are looking for
if string.sub(ttf,ktoffset + 1, ktoffset + 4) == "\000\001\000\000" then
--print("made it this far")
ntables = s.unpack(">I4",(string.sub(ttf,ktoffset + 5, ktoffset + 8)))
ntables_bad = s.unpack(">I4","\016\000\000\000")
if ntables >= ntables_bad then
--print("we have a match " .. ntables)
return 1
end
end
end
end
offset = offset + shortlen
end
return 0
end