python: Security fix CVE-2016-1000110

(From OE-Core rev: d3f0d6834416b3ee0e09f7b6a3ae09839fc16376)

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 158 insertions, 0 deletions

diff --git a/meta/recipes-devtools/python/python/CVE-2016-1000110.patch b/meta/recipes-devtools/python/python/CVE-2016-1000110.patch
new file mode 100644
index 0000000000..071175acec
--- /dev/null
+++ b/meta/recipes-devtools/python/python/CVE-2016-1000110.patch
@@ -0,0 +1,157 @@
+From 5be8d3e97b1d2e526548cb346fd5f8980d31616a Mon Sep 17 00:00:00 2001
+From: Senthil Kumaran <senthil@uthcode.com>
+Date: Sat, 30 Jul 2016 05:49:53 -0700
+Subject: [PATCH] Prevent HTTPoxy attack (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 reported and patch contributed by Rémi Rampin.
+
+Upstream-Status: Backport
+CVE: CVE-2016-1000110
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ Doc/howto/urllib2.rst   |  5 +++++
+ Doc/library/urllib.rst  | 10 ++++++++++
+ Doc/library/urllib2.rst |  5 +++++
+ Lib/test/test_urllib.py | 12 ++++++++++++
+ Lib/urllib.py           |  9 +++++++++
+ Misc/ACKS               |  1 +
+ Misc/NEWS               |  4 ++++
+ 7 files changed, 46 insertions(+)
+
+Index: Python-2.7.11/Doc/howto/urllib2.rst
+===================================================================
+--- Python-2.7.11.orig/Doc/howto/urllib2.rst
++++ Python-2.7.11/Doc/howto/urllib2.rst
+@@ -523,6 +523,11 @@ setting up a `Basic Authentication`_ han
+     through a proxy.  However, this can be enabled by extending urllib2 as
+     shown in the recipe [#]_.
+ 
++.. note::
++
++    ``HTTP_PROXY`` will be ignored if a variable ``REQUEST_METHOD`` is set; see
++    the documentation on :func:`~urllib.getproxies`.
++
+ 
+ Sockets and Layers
+ ==================
+Index: Python-2.7.11/Doc/library/urllib.rst
+===================================================================
+--- Python-2.7.11.orig/Doc/library/urllib.rst
++++ Python-2.7.11/Doc/library/urllib.rst
+@@ -293,6 +293,16 @@ Utility functions
+    find it, looks for proxy information from Mac OSX System Configuration for
+    Mac OS X and Windows Systems Registry for Windows.
+ 
++    .. 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).
++
+ .. note::
+     urllib also exposes certain utility functions like splittype, splithost and
+     others parsing url into various components. But it is recommended to use
+Index: Python-2.7.11/Doc/library/urllib2.rst
+===================================================================
+--- Python-2.7.11.orig/Doc/library/urllib2.rst
++++ Python-2.7.11/Doc/library/urllib2.rst
+@@ -229,6 +229,11 @@ The following classes are provided:
+ 
+    To disable autodetected proxy pass an empty dictionary.
+ 
++    .. note::
++
++       ``HTTP_PROXY`` will be ignored if a variable ``REQUEST_METHOD`` is set;
++       see the documentation on :func:`~urllib.getproxies`.
++
+ 
+ .. class:: HTTPPasswordMgr()
+ 
+Index: Python-2.7.11/Misc/ACKS
+===================================================================
+--- Python-2.7.11.orig/Misc/ACKS
++++ Python-2.7.11/Misc/ACKS
+@@ -1110,6 +1110,7 @@ Jérôme Radix
+ Burton Radons
+ Jeff Ramnani
+ Brodie Rao
++Rémi Rampin
+ Senko Rasic
+ Antti Rasinen
+ Nikolaus Rath
+Index: Python-2.7.11/Lib/test/test_urllib.py
+===================================================================
+--- Python-2.7.11.orig/Lib/test/test_urllib.py
++++ Python-2.7.11/Lib/test/test_urllib.py
+@@ -162,6 +162,18 @@ class ProxyTests(unittest.TestCase):
+         self.assertTrue(urllib.proxy_bypass_environment('anotherdomain.com'))
+ 
+ 
++    def test_proxy_cgi_ignore(self):
++        try:
++            self.env.set('HTTP_PROXY', 'http://somewhere:3128')
++            proxies = urllib.getproxies_environment()
++            self.assertEqual('http://somewhere:3128', proxies['http'])
++            self.env.set('REQUEST_METHOD', 'GET')
++            proxies = urllib.getproxies_environment()
++            self.assertNotIn('http', proxies)
++        finally:
++            self.env.unset('REQUEST_METHOD')
++            self.env.unset('HTTP_PROXY')
++
+ class urlopen_HttpTests(unittest.TestCase, FakeHTTPMixin):
+     """Test urlopen() opening a fake http connection."""
+ 
+Index: Python-2.7.11/Lib/urllib.py
+===================================================================
+--- Python-2.7.11.orig/Lib/urllib.py
++++ Python-2.7.11/Lib/urllib.py
+@@ -1382,11 +1382,21 @@ def getproxies_environment():
+     [Fancy]URLopener constructor.
+ 
+     """
++    # Get all variables
+     proxies = {}
+     for name, value in os.environ.items():
+         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)
++
++    # Get lowercase variables
+     return proxies
+ 
+ def proxy_bypass_environment(host):
+Index: Python-2.7.11/Misc/NEWS
+===================================================================
+--- Python-2.7.11.orig/Misc/NEWS
++++ Python-2.7.11/Misc/NEWS
+@@ -10,6 +10,10 @@ What's New in Python 2.7.11?
+ Library
+ -------
+ 
++- 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 #25624: ZipFile now always writes a ZIP_STORED header for directory
+   entries.  Patch by Dingyuan Wang.
+ 
diff --git a/meta/recipes-devtools/python/python_2.7.11.bb b/meta/recipes-devtools/python/python_2.7.11.bb
index 606f153623..9697c1bf0b 100644
--- a/meta/recipes-devtools/python/python_2.7.11.bb
+++ b/meta/recipes-devtools/python/python_2.7.11.bb
@@ -27,6 +27,7 @@ SRC_URI += "\
   file://use_sysroot_ncurses_instead_of_host.patch \
   file://avoid_parallel_make_races_on_pgen.patch \
   file://add-CROSSPYTHONPATH-for-PYTHON_FOR_BUILD.patch \
+  file://CVE-2016-1000110.patch \
 "
 
 S = "${WORKDIR}/Python-${PV}"