Blame SOURCES/00242-CVE-2016-1000110-httpoxy.patch

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From 3a184cc875709d4324d234a4b939d614a2c9bb0f Mon Sep 17 00:00:00 2001
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From: Charalampos Stratakis <cstratak@redhat.com>
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Date: Mon, 1 Aug 2016 11:20:11 +0200
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Subject: [PATCH] =?UTF-8?q?Fix=20for=20CVE-2016-1000110=20http://bugs.pyth?=
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 =?UTF-8?q?on.org/issue27568=20Based=20on=20the=20patch=20by=20R=C3=A9mi?=
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 =?UTF-8?q?=20Rampin?=
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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---
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 Doc/howto/urllib2.rst   |  5 +++++
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 Doc/library/urllib.rst  | 10 ++++++++++
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 Doc/library/urllib2.rst |  4 ++++
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 Lib/test/test_urllib.py | 12 ++++++++++++
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 Lib/urllib.py           |  9 +++++++++
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 5 files changed, 40 insertions(+)
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diff --git a/Doc/howto/urllib2.rst b/Doc/howto/urllib2.rst
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index f84bf08..6542846 100644
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--- a/Doc/howto/urllib2.rst
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+++ b/Doc/howto/urllib2.rst
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@@ -523,6 +523,11 @@ setting up a `Basic Authentication`_ handler : ::
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     through a proxy.  However, this can be enabled by extending urllib2 as
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     shown in the recipe [#]_.
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+.. note::
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+
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+    ``HTTP_PROXY`` will be ignored if a variable ``REQUEST_METHOD`` is set; see
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+    the documentation on :func:`~urllib.getproxies`.
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+
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 Sockets and Layers
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 ==================
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diff --git a/Doc/library/urllib.rst b/Doc/library/urllib.rst
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index c7d200d..3b9876e 100644
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--- a/Doc/library/urllib.rst
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+++ b/Doc/library/urllib.rst
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@@ -280,6 +280,16 @@ Utility functions
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    find it, looks for proxy information from Mac OSX System Configuration for
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    Mac OS X and Windows Systems Registry for Windows.
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+    .. note::
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+
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+        If the environment variable ``REQUEST_METHOD`` is set, which usually
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+        indicates your script is running in a CGI environment, the environment
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+        variable ``HTTP_PROXY`` (uppercase ``_PROXY``) will be ignored. This is
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+        because that variable can be injected by a client using the "Proxy:"
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+        HTTP header. If you need to use an HTTP proxy in a CGI environment,
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+        either use ``ProxyHandler`` explicitly, or make sure the variable name
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+        is in lowercase (or at least the ``_proxy`` suffix).
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+
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 .. note::
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     urllib also exposes certain utility functions like splittype, splithost and
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     others parsing url into various components. But it is recommended to use
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diff --git a/Doc/library/urllib2.rst b/Doc/library/urllib2.rst
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index 24deeb4..46fce59 100644
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--- a/Doc/library/urllib2.rst
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+++ b/Doc/library/urllib2.rst
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@@ -224,6 +224,10 @@ The following classes are provided:
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    To disable autodetected proxy pass an empty dictionary.
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+    .. note::
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+
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+       ``HTTP_PROXY`` will be ignored if a variable ``REQUEST_METHOD`` is set;
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+       see the documentation on :func:`~urllib.getproxies`.
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 .. class:: HTTPPasswordMgr()
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diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
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index 3a273f8..3845012 100644
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--- a/Lib/test/test_urllib.py
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+++ b/Lib/test/test_urllib.py
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@@ -161,6 +161,18 @@ class ProxyTests(unittest.TestCase):
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         self.env.set('NO_PROXY', 'localhost, anotherdomain.com, newdomain.com')
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         self.assertTrue(urllib.proxy_bypass_environment('anotherdomain.com'))
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+    def test_proxy_cgi_ignore(self):
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+        try:
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+            self.env.set('HTTP_PROXY', 'http://somewhere:3128')
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+            proxies = urllib.getproxies_environment()
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+            self.assertEqual('http://somewhere:3128', proxies['http'])
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+            self.env.set('REQUEST_METHOD', 'GET')
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+            proxies = urllib.getproxies_environment()
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+            self.assertNotIn('http', proxies)
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+        finally:
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+            self.env.unset('REQUEST_METHOD')
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+            self.env.unset('HTTP_PROXY')
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+
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 class urlopen_HttpTests(unittest.TestCase, FakeHTTPMixin):
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     """Test urlopen() opening a fake http connection."""
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diff --git a/Lib/urllib.py b/Lib/urllib.py
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index f9655f9..9b31df1 100644
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--- a/Lib/urllib.py
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+++ b/Lib/urllib.py
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@@ -1361,11 +1361,20 @@ def getproxies_environment():
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     [Fancy]URLopener constructor.
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     """
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+    # Get all variables
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     proxies = {}
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     for name, value in os.environ.items():
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         name = name.lower()
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         if value and name[-6:] == '_proxy':
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             proxies[name[:-6]] = value
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+
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+    # CVE-2016-1000110 - If we are running as CGI script, forget HTTP_PROXY
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+    # (non-all-lowercase) as it may be set from the web server by a "Proxy:"
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+    # header from the client
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+    # If "proxy" is lowercase, it will still be used thanks to the next block
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+    if 'REQUEST_METHOD' in os.environ:
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+        proxies.pop('http', None)
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+
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     return proxies
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 def proxy_bypass_environment(host):
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-- 
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2.7.4
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