platform.py uses os.popen command

[Bernd Dietzel]

Uses depreached os.popen command.
Shell Code can be injected, see example below.
Replace it with subprocess please.

file :
/usr/lib/python3.5/platform.py

line 416:
    return os.popen(cmd, mode, bufsize)

Example which starts the program xeyes but should not :

~$ python
Python 2.7.11+ (default, Feb 22 2016, 16:38:42)
[GCC 5.3.1 20160222] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import platform
>>> filename = 'bad file ;xeyes;# name.png'
>>> platform.popen('ls %s' %filename)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: libpython3.5-minimal 3.5.1-6ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-7.22-generic 4.4.2
Uname: Linux 4.4.0-7-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Feb 27 07:16:55 2016
InstallationDate: Installed on 2016-02-22 (4 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160219)
SourcePackage: python3.5
UpgradeStatus: No upgrade log present (probably fresh install)