Fix for CVE-2016-1000110 HTTPoxy attackHEADepel7

1 files changed, 100 insertions, 0 deletions

diff --git a/00242-CVE-2016-1000110-httpoxy.patch b/00242-CVE-2016-1000110-httpoxy.patch
new file mode 100644
index 0000000..7c17b31
--- /dev/null
+++ b/00242-CVE-2016-1000110-httpoxy.patch
@@ -0,0 +1,100 @@
+
+# HG changeset patch
+# User Senthil Kumaran <senthil@uthcode.com>
+# Date 1469947146 25200
+# Node ID a0ac52ed8f7918222603b584ec8fc93d9b7bc0a5
+# Parent  4cb94e561e2db9865fb4d752f2bceefca4c6819a# Parent  3c19023c9fec5a615c25598468b44fade89049ce
+[merge from 3.4] - 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 #27568 Reported and patch contributed by Rémi Rampin.
+
+diff --git a/Doc/howto/urllib2.rst b/Doc/howto/urllib2.rst
+--- a/Doc/howto/urllib2.rst
++++ b/Doc/howto/urllib2.rst
+@@ -538,6 +538,11 @@ setting up a `Basic Authentication`_ han
+     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
+--- a/Doc/library/urllib.request.rst
++++ b/Doc/library/urllib.request.rst
+@@ -166,6 +166,16 @@ The :mod:`urllib.request` module defines the following functions:
+    cannot 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).
++
+ 
+ The following classes are provided:
+ 
+@@ -275,6 +285,12 @@ 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.request.getproxies`.
++
++
+ 
+ .. class:: HTTPPasswordMgr()
+ 
+diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
+--- a/Lib/test/test_urllib.py
++++ b/Lib/test/test_urllib.py
+@@ -225,6 +225,18 @@ class ProxyTests(unittest.TestCase):
+         self.env.set('NO_PROXY', 'localhost, anotherdomain.com, newdomain.com')
+         self.assertTrue(urllib.request.proxy_bypass_environment('anotherdomain.com'))
+ 
++    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')
++
+ class urlopen_HttpTests(unittest.TestCase, FakeHTTPMixin, FakeFTPMixin):
+     """Test urlopen() opening a fake http connection."""
+
+diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
+--- a/Lib/urllib/request.py
++++ b/Lib/urllib/request.py
+@@ -2394,6 +2394,12 @@ 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)    
+     return proxies
+ 
+ def proxy_bypass_environment(host):
+