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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 (From OE-Core rev: 1dd22b9d35983f35c481a1fcf67425aa0fd07a5b) Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Mingli Yu
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Richard Purdie
Richard Purdie
parent
b5a00339d9
commit
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From aab3e8c432b90508ac14755128f5a687be2fdf43 Mon Sep 17 00:00:00 2001
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From: Mingli Yu <Mingli.Yu@windriver.com>
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Date: Thu, 22 Sep 2016 16:39:49 +0800
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Subject: [PATCH] python3: fix CVE-2016-1000110
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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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Ignore the HTTP_PROXY variable when REQUEST_METHOD environment is set, which
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indicates that the script is in CGI mode.
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Issue #27568 Reported and patch contributed by Rémi Rampin. [#27568]
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Backport patch from https://hg.python.org/cpython/rev/a0ac52ed8f79
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Upstream-Status: Backport
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CVE: CVE-2016-1000110
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Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com>
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---
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Doc/howto/urllib2.rst | 5 +++++
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Doc/library/urllib.request.rst | 17 ++++++++++++++++-
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Lib/test/test_urllib.py | 14 +++++++++++++-
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Lib/urllib/request.py | 6 ++++++
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Misc/NEWS | 4 ++++
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5 files changed, 44 insertions(+), 2 deletions(-)
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diff --git a/Doc/howto/urllib2.rst b/Doc/howto/urllib2.rst
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index 24a4156..d2c7991 100644
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--- a/Doc/howto/urllib2.rst
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+++ b/Doc/howto/urllib2.rst
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@@ -538,6 +538,11 @@ setting up a `Basic Authentication`_ handler: ::
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through a proxy. However, this can be enabled by extending urllib.request 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.request.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.request.rst b/Doc/library/urllib.request.rst
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index 1338906..1291aeb 100644
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--- a/Doc/library/urllib.request.rst
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+++ b/Doc/library/urllib.request.rst
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@@ -173,6 +173,16 @@ The :mod:`urllib.request` module defines the following functions:
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If both lowercase and uppercase environment variables exist (and disagree),
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lowercase is preferred.
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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:" HTTP
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+ header. If you need to use an HTTP proxy in a CGI environment, either use
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+ ``ProxyHandler`` explicitly, or make sure the variable name is in
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+ lowercase (or at least the ``_proxy`` suffix).
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+
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The following classes are provided:
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@@ -280,6 +290,11 @@ The following classes are provided:
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list of hostname suffixes, optionally with ``:port`` appended, for example
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``cern.ch,ncsa.uiuc.edu,some.host:8080``.
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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.request.getproxies`.
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+
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.. class:: HTTPPasswordMgr()
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@@ -1138,7 +1153,7 @@ the returned bytes object to string once it determines or guesses
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the appropriate encoding.
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The following W3C document, https://www.w3.org/International/O-charset\ , lists
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-the various ways in which a (X)HTML or a XML document could have specified its
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+the various ways in which an (X)HTML or an XML document could have specified its
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encoding information.
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As the python.org website uses *utf-8* encoding as specified in its meta tag, we
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diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
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index 5d05f8d..247598a 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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@@ -1,4 +1,4 @@
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-"""Regresssion tests for what was in Python 2's "urllib" module"""
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+"""Regression tests for what was in Python 2's "urllib" module"""
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import urllib.parse
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import urllib.request
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@@ -232,6 +232,18 @@ class ProxyTests(unittest.TestCase):
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self.assertTrue(urllib.request.proxy_bypass_environment('anotherdomain.com:8888'))
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self.assertTrue(urllib.request.proxy_bypass_environment('newdomain.com:1234'))
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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.request.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.request.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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def test_proxy_bypass_environment_host_match(self):
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bypass = urllib.request.proxy_bypass_environment
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self.env.set('NO_PROXY',
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diff --git a/Lib/urllib/request.py b/Lib/urllib/request.py
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index 1731fe3..3be327d 100644
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--- a/Lib/urllib/request.py
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+++ b/Lib/urllib/request.py
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@@ -2412,6 +2412,12 @@ def getproxies_environment():
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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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+ # 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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for name, value in os.environ.items():
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if name[-6:] == '_proxy':
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name = name.lower()
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diff --git a/Misc/NEWS b/Misc/NEWS
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index 4ad2551..2fcc95b 100644
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--- a/Misc/NEWS
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+++ b/Misc/NEWS
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@@ -329,6 +329,10 @@ Library
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- Issue #26644: Raise ValueError rather than SystemError when a negative
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length is passed to SSLSocket.recv() or read().
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+- Issue #27568: Prevent HTTPoxy attack (CVE-2016-1000110). Ignore the
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+ HTTP_PROXY variable when REQUEST_METHOD environment is set, which indicates
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+ that the script is in CGI mode.
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+
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- Issue #23804: Fix SSL recv(0) and read(0) methods to return zero bytes
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instead of up to 1024.
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--
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2.8.1
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