File CVE-2021-3426-inf-disclosure-pydoc-getfile.patch of Package python3.19550

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File CVE-2021-3426-inf-disclosure-pydoc-getfile.patch of Package python3.19550

From 5b1e50256b6532667b6d31debc350f6c7d3f30aa Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 29 Mar 2021 08:40:53 -0700
Subject: [PATCH] bpo-42988: Remove the pydoc getfile feature (GH-25015)
 (GH-25067)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

CVE-2021-3426: Remove the "getfile" feature of the pydoc module which
could be abused to read arbitrary files on the disk (directory
traversal vulnerability). Moreover, even source code of Python
modules can contain sensitive data like passwords. Vulnerability
reported by David Schwörer.
(cherry picked from commit 9b999479c0022edfc9835a8a1f06e046f3881048)

Co-authored-by: Victor Stinner <vstinner@python.org>
---
 Lib/pydoc.py                                                       |   18 ----------
 Lib/test/test_pydoc.py                                             |    6 ---
 Misc/NEWS.d/next/Security/2021-03-24-14-16-56.bpo-42988.P2aNco.rst |    4 ++
 3 files changed, 4 insertions(+), 24 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Security/2021-03-24-14-16-56.bpo-42988.P2aNco.rst

--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -2311,9 +2311,6 @@ def _url_handler(url, content_type="text
 %s</head><body bgcolor="#f0f0f8">%s<div style="clear:both;padding-top:.5em;">%s</div>
 </body></html>''' % (title, css_link, html_navbar(), contents)
 
-        def filelink(self, url, path):
-            return '<a href="getfile?key=%s">%s</a>' % (url, path)
-
 
     html = _HTMLDoc()
 
@@ -2399,19 +2396,6 @@ def _url_handler(url, content_type="text
             'key = %s' % key, '#ffffff', '#ee77aa', '<br>'.join(results))
         return 'Search Results', contents
 
-    def html_getfile(path):
-        """Get and display a source file listing safely."""
-        path = urllib.parse.unquote(path)
-        with tokenize.open(path) as fp:
-            lines = html.escape(fp.read())
-        body = '<pre>%s</pre>' % lines
-        heading = html.heading(
-            '<big><big><strong>File Listing</strong></big></big>',
-            '#ffffff', '#7799ee')
-        contents = heading + html.bigsection(
-            'File: %s' % path, '#ffffff', '#ee77aa', body)
-        return 'getfile %s' % path, contents
-
     def html_topics():
         """Index of topic texts available."""
 
@@ -2503,8 +2487,6 @@ def _url_handler(url, content_type="text
                 op, _, url = url.partition('=')
                 if op == "search?key":
                     title, content = html_search(url)
-                elif op == "getfile?key":
-                    title, content = html_getfile(url)
                 elif op == "topic?key":
                     # try topics first, then objects.
                     try:
--- a/Lib/test/test_pydoc.py
+++ b/Lib/test/test_pydoc.py
@@ -1052,18 +1052,12 @@ class PydocUrlHandlerTest(PydocBaseTest)
             ("topic?key=def", "Pydoc: KEYWORD def"),
             ("topic?key=STRINGS", "Pydoc: TOPIC STRINGS"),
             ("foobar", "Pydoc: Error - foobar"),
-            ("getfile?key=foobar", "Pydoc: Error - getfile?key=foobar"),
             ]
 
         with self.restrict_walk_packages():
             for url, title in requests:
                 self.call_url_handler(url, title)
 
-            path = string.__file__
-            title = "Pydoc: getfile " + path
-            url = "getfile?key=" + path
-            self.call_url_handler(url, title)
-
 
 class TestHelper(unittest.TestCase):
     def test_keywords(self):
--- /dev/null
+++ b/Misc/NEWS.d/next/Security/2021-03-24-14-16-56.bpo-42988.P2aNco.rst
@@ -0,0 +1,4 @@
+CVE-2021-3426: Remove the ``getfile`` feature of the :mod:`pydoc` module which
+could be abused to read arbitrary files on the disk (directory traversal
+vulnerability). Moreover, even source code of Python modules can contain
+sensitive data like passwords. Vulnerability reported by David Schwörer.

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