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CVE-2015-2377.lua
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CVE-2015-2377.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.
Detection for CVE-2015-2377 expects XLSX
This lua script can be run standalone and verbosely on a Flash file with
echo "run()" | luajit -i <script name> <xlsx file>
Will Metcalf
Chris Wakelin
Francis Trudeau
--]]
require("zip")
function init (args)
local needs = {}
needs["http.response_body"] = tostring(true)
return needs
end
function find_legend_count(u,filename,verbose)
local rtn = 0
legendelements = string.gfind(u, "<c:legend.-</c:legend[^E]")
for s in legendelements do
if string.match(s, "<c:legendPos") then
if (verbose==1) then print ("Valid legend") end
else
if (verbose==1) then print ("Possible CVE-2015-2377 found") end
rtn = 1
end
end
end
function xls_handler(t,verbose)
rtn = 0
tmpname = os.tmpname()
tmp = io.open(tmpname,'w')
tmp:write(t)
tmp:close()
z,err = zip.open(tmpname)
local buffers = {}
if z then
for w in z:files() do
if string.find(w.filename,"xl/charts/",1,true) then
f = z:open(w.filename);
u = f:read("*all")
f:close()
if (verbose==1) then print("Checking " .. w.filename) end
rtn2 = find_legend_count(u,w.filename,verbose)
if (verbose == 0) then
if rtn2 == 1 then return 1 end
end
if rtn2 == 1 then rtn = rtn2 end
end
end
end
if err then print(err) end
if z then z:close() end
os.remove(tmpname)
return rtn
end
function common(t,o,verbose)
rtn = 0
if string.sub(t,1,4) == "PK\003\004" then
rtn = xls_handler(t,verbose)
end
return rtn
end
function match(args)
local t = tostring(args["http.response_body"])
local o = args["offset"]
return common(t,o,0)
end
function run()
local f = io.open(arg[1])
local t = f:read("*all")
f:close()
common(t,4,1)
end