python: fix CVE-2016-1000110

Backport patch to fix CVE-2016-1000110 from python upstream:
for python2.7
https://hg.python.org/cpython/rev/ba915d561667/
for python3
https://hg.python.org/cpython/rev/a0ac52ed8f79

Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 148 insertions, 0 deletions

diff --git a/meta/recipes-devtools/python/python3/python3-fix-CVE-2016-1000110.patch b/meta/recipes-devtools/python/python3/python3-fix-CVE-2016-1000110.patch
new file mode 100644
index 0000000000..ab1b7230ea
--- /dev/null
+++ b/meta/recipes-devtools/python/python3/python3-fix-CVE-2016-1000110.patch
@@ -0,0 +1,148 @@
+From aab3e8c432b90508ac14755128f5a687be2fdf43 Mon Sep 17 00:00:00 2001
+From: Mingli Yu <Mingli.Yu@windriver.com>
+Date: Thu, 22 Sep 2016 16:39:49 +0800
+Subject: [PATCH] python3: fix CVE-2016-1000110
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Ignore the HTTP_PROXY variable when REQUEST_METHOD environment is set, which
+indicates that the script is in CGI mode.
+
+Issue #27568 Reported and patch contributed by Rémi Rampin. [#27568]
+
+Backport patch from https://hg.python.org/cpython/rev/a0ac52ed8f79
+
+Upstream-Status: Backport
+CVE: CVE-2016-1000110
+Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
+---
+ Doc/howto/urllib2.rst          |  5 +++++
+ Doc/library/urllib.request.rst | 17 ++++++++++++++++-
+ Lib/test/test_urllib.py        | 14 +++++++++++++-
+ Lib/urllib/request.py          |  6 ++++++
+ Misc/NEWS                      |  4 ++++
+ 5 files changed, 44 insertions(+), 2 deletions(-)
+
+diff --git a/Doc/howto/urllib2.rst b/Doc/howto/urllib2.rst
+index 24a4156..d2c7991 100644
+--- a/Doc/howto/urllib2.rst
++++ b/Doc/howto/urllib2.rst
+@@ -538,6 +538,11 @@ setting up a `Basic Authentication`_ handler: ::
+     through a proxy.  However, this can be enabled by extending urllib.request as
+     shown in the recipe [#]_.
+ 
++.. note::
++
++    ``HTTP_PROXY`` will be ignored if a variable ``REQUEST_METHOD`` is set; see
++    the documentation on :func:`~urllib.request.getproxies`.
++
+ 
+ Sockets and Layers
+ ==================
+diff --git a/Doc/library/urllib.request.rst b/Doc/library/urllib.request.rst
+index 1338906..1291aeb 100644
+--- a/Doc/library/urllib.request.rst
++++ b/Doc/library/urllib.request.rst
+@@ -173,6 +173,16 @@ The :mod:`urllib.request` module defines the following functions:
+    If both lowercase and uppercase environment variables exist (and disagree),
+    lowercase is preferred.
+ 
++    .. note::
++
++       If the environment variable ``REQUEST_METHOD`` is set, which usually
++       indicates your script is running in a CGI environment, the environment
++       variable ``HTTP_PROXY`` (uppercase ``_PROXY``) will be ignored. This is
++       because that variable can be injected by a client using the "Proxy:" HTTP
++       header. If you need to use an HTTP proxy in a CGI environment, either use
++       ``ProxyHandler`` explicitly, or make sure the variable name is in
++       lowercase (or at least the ``_proxy`` suffix).
++
+ 
+ The following classes are provided:
+ 
+@@ -280,6 +290,11 @@ The following classes are provided:
+    list of hostname suffixes, optionally with ``:port`` appended, for example
+    ``cern.ch,ncsa.uiuc.edu,some.host:8080``.
+ 
++    .. note::
++
++       ``HTTP_PROXY`` will be ignored if a variable ``REQUEST_METHOD`` is set;
++       see the documentation on :func:`~urllib.request.getproxies`.
++
+ 
+ .. class:: HTTPPasswordMgr()
+ 
+@@ -1138,7 +1153,7 @@ the returned bytes object to string once it determines or guesses
+ the appropriate encoding.
+ 
+ The following W3C document, https://www.w3.org/International/O-charset\ , lists
+-the various ways in which a (X)HTML or a XML document could have specified its
++the various ways in which an (X)HTML or an XML document could have specified its
+ encoding information.
+ 
+ As the python.org website uses *utf-8* encoding as specified in its meta tag, we
+diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
+index 5d05f8d..247598a 100644
+--- a/Lib/test/test_urllib.py
++++ b/Lib/test/test_urllib.py
+@@ -1,4 +1,4 @@
+-"""Regresssion tests for what was in Python 2's "urllib" module"""
++"""Regression tests for what was in Python 2's "urllib" module"""
+ 
+ import urllib.parse
+ import urllib.request
+@@ -232,6 +232,18 @@ class ProxyTests(unittest.TestCase):
+         self.assertTrue(urllib.request.proxy_bypass_environment('anotherdomain.com:8888'))
+         self.assertTrue(urllib.request.proxy_bypass_environment('newdomain.com:1234'))
+ 
++    def test_proxy_cgi_ignore(self):
++        try:
++            self.env.set('HTTP_PROXY', 'http://somewhere:3128')
++            proxies = urllib.request.getproxies_environment()
++            self.assertEqual('http://somewhere:3128', proxies['http'])
++            self.env.set('REQUEST_METHOD', 'GET')
++            proxies = urllib.request.getproxies_environment()
++            self.assertNotIn('http', proxies)
++        finally:
++            self.env.unset('REQUEST_METHOD')
++            self.env.unset('HTTP_PROXY')
++
+     def test_proxy_bypass_environment_host_match(self):
+         bypass = urllib.request.proxy_bypass_environment
+         self.env.set('NO_PROXY',
+diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
+index 1731fe3..3be327d 100644
+--- a/Lib/urllib/request.py
++++ b/Lib/urllib/request.py
+@@ -2412,6 +2412,12 @@ def getproxies_environment():
+         name = name.lower()
+         if value and name[-6:] == '_proxy':
+             proxies[name[:-6]] = value
++    # CVE-2016-1000110 - If we are running as CGI script, forget HTTP_PROXY
++    # (non-all-lowercase) as it may be set from the web server by a "Proxy:"
++    # header from the client
++    # If "proxy" is lowercase, it will still be used thanks to the next block
++    if 'REQUEST_METHOD' in os.environ:
++        proxies.pop('http', None)
+     for name, value in os.environ.items():
+         if name[-6:] == '_proxy':
+             name = name.lower()
+diff --git a/Misc/NEWS b/Misc/NEWS
+index 4ad2551..2fcc95b 100644
+--- a/Misc/NEWS
++++ b/Misc/NEWS
+@@ -329,6 +329,10 @@ Library
+ - Issue #26644: Raise ValueError rather than SystemError when a negative
+   length is passed to SSLSocket.recv() or read().
+ 
++- Issue #27568: Prevent HTTPoxy attack (CVE-2016-1000110). Ignore the
++  HTTP_PROXY variable when REQUEST_METHOD environment is set, which indicates
++  that the script is in CGI mode.
++
+ - Issue #23804: Fix SSL recv(0) and read(0) methods to return zero bytes
+   instead of up to 1024.
+ 
+-- 
+2.8.1
+