(CVE-2019-18370)Xiaomi Mi WiFi R3G 远程命令执行漏洞

function cUpload()
    local LuciFs = require("luci.fs")
    local XQBackup = require("xiaoqiang.module.XQBackup")
    local code = 0
    local canupload = true
    local uploadFilepath = "/tmp/cfgbackup.tar.gz"
    local fileSize = tonumber(LuciHttp.getenv("CONTENT_LENGTH"))
    if fileSize > 102400 then
        canupload = false
    end
    LuciHttp.setfilehandler(
        function(meta, chunk, eof)
            if canupload then
                if not fp then
                    if meta and meta.name == "image" then
                        fp = io.open(uploadFilepath, "w")
                    end
                end
                if chunk then
                    fp:write(chunk)
                end
                if eof then
                    fp:close()
                end
            else
                code = 1630
            end
        end
    )
    if LuciHttp.formvalue("image") and fp then
        code = 0
    end
    local result = {}
    if code == 0 then
        local ext = XQBackup.extract(uploadFilepath)
        if ext == 0 then
            result["des"] = XQBackup.getdes()
        else
            code = 1629
        end
    end
    if code ~= 0 then
        result["msg"] = XQErrorUtil.getErrorMessage(code)
        LuciFs.unlink(uploadFilepath)
    end
    result["code"] = code
    LuciHttp.write_json(result)
end

-- 0:succeed
-- 1:file does not exist
-- 2:no description file
-- 3:no mbu file
function extract(filepath)
    local fs = require("nixio.fs")
    local tarpath = filepath
    if not tarpath then
        tarpath = TARMBUFILE
    end
    if not fs.access(tarpath) then
        return 1
    end
    os.execute("cd /tmp; tar -xzf "..tarpath.." >/dev/null 2>/dev/null")
    os.execute("rm "..tarpath.." >/dev/null 2>/dev/null")
    if not fs.access(DESFILE) then
        return 2
    end
    if not fs.access(MBUFILE) then
        return 3
    end
    return 0

#!/usr/bin/env lua
-- ...
local cfg = {
-- ...
	['xmlfile'] = "/usr/share/speedtest.xml",
        ['tmp_speedtest_xml'] = "/tmp/speedtest_urls.xml",
}
VERSION="__UNDEFINED__"
-- ...
-- 测试网速使用的url文件为，若存在/tmp/speedtest_urls.xml则使用，否则用/usr/share/speedtest.xml
local filename = ""
filexml = io.open(cfg.tmp_speedtest_xml)
if filexml then
    filexml:close()
    filename = cfg.tmp_speedtest_xml
else
    filename = cfg.xmlfile
end

local pp = io.open(filename)
local line = pp:read("*line")
local size = 0
local resources = {}
local u = ""
local pids = {}
-- ...
function wget_work(url)
	local _url = url
	pid = posix.fork()
	if pid < 0 then
		print("fork error")
		return -1
	elseif pid > 0 then
		--print(string.format("child pid %d\n", pid))
	else
        -- 拼接命令，最终在这里执行
		os.execute('for i in $(seq '.. math.floor(cfg.nr/cfg.nc) ..'); do wget '.. url  ..
		" -q -O /dev/null; done")
	end
	return pid
end

while line do
    -- 从文件中提取url， 这里提取没有进行过滤
	local _, _, url = string.find(line,'<item url="(.*)"/>')
	if url then
		table.insert(resources, url)
	end
	line = pp:read("*line")
end
pp:close()

local urls = mrandom(1, table.getn(resources), cfg.nc)

for k, v in ipairs(urls) do
	if VERSION == "LESSMEM" then
		local pid = wget_work_loop(resources[v])
	else
        -- VERSION 为 __UNDEFINED__， url直接作为参数
		local pid = wget_work(resources[v])
	end
	if(pid == 0) then
		os.exit(0)
	elseif(pid == -1) then
		done()
	end
end

function netspeed()
    local XQPreference = require("xiaoqiang.XQPreference")
    local XQNSTUtil = require("xiaoqiang.module.XQNetworkSpeedTest")
    local code = 0
    local result = {}
    local history = LuciHttp.formvalue("history")
    if history then
        result["bandwidth"] = tonumber(XQPreference.get("BANDWIDTH", 0, "xiaoqiang"))
        result["download"] = tonumber(string.format("%.2f", 128 * result.bandwidth))
        result["bandwidth2"] = tonumber(XQPreference.get("BANDWIDTH2", 0, "xiaoqiang"))
        result["upload"] = tonumber(string.format("%.2f", 128 * result.bandwidth2))
    else
        os.execute("/etc/init.d/miqos stop")
        -- 这里调用了downloadSpeedTest
        local download = XQNSTUtil.downloadSpeedTest()
        if download then
            result["download"] = download
            result["bandwidth"] = tonumber(string.format("%.2f", 8 * download/1024))
            XQPreference.set("BANDWIDTH", tostring(result.bandwidth), "xiaoqiang")
        else
            code = 1588
        end
        if code ~= 0 then
           result["msg"] = XQErrorUtil.getErrorMessage(code)
        end
        os.execute("/etc/init.d/miqos start")
    end
    
    result["code"] = code
    LuciHttp.write_json(result)
end
function downloadSpeedTest()
    local speedtest = "/usr/bin/download_speedtest"
    local speed
    -- 直接调用sh文件
    for _, line in ipairs(LuciUtil.execl(speedtest)) do
        if not XQFunction.isStrNil(line) and line:match("^avg rx:") then
            speed = line:match("^avg rx:(%S+)")
            if speed then
                speed = tonumber(string.format("%.2f",speed/8))
            end
            break
        end
    end
    return speed
end