[Python-checkins] [3.7] gh-104049: do not expose on-disk location from SimpleHTTPRequestHandler (GH-104122)

[ned-deily]

https://github.com/python/cpython/commit/4e2dd0c3626649224b87b757a292959d94152a00
commit: 4e2dd0c3626649224b87b757a292959d94152a00
branch: 3.7
author: Miss Islington (bot) <31488909+miss-islington at users.noreply.github.com>
committer: ned-deily <nad at python.org>
date: 2023-05-27T02:41:46-04:00
summary:

[3.7] gh-104049: do not expose on-disk location from SimpleHTTPRequestHandler (GH-104122)

Do not expose the local server's on-disk location from `SimpleHTTPRequestHandler` when generating a directory index. (unnecessary information disclosure)

(cherry picked from commit c7c3a60c88de61a79ded9fdaf6bc6a29da4efb9a)

Co-authored-by: Ethan Furman <ethan at stoneleaf.us>
Co-authored-by: Gregory P. Smith <greg at krypto.org>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra at gmail.com>

files:
A Misc/NEWS.d/next/Security/2023-05-01-15-03-25.gh-issue-104049.b01Y3g.rst
M Lib/http/server.py
M Lib/test/test_httpservers.py

diff --git a/Lib/http/server.py b/Lib/http/server.py
index ba2acbc98bf7..beabe3de7abb 100644
--- a/Lib/http/server.py
+++ b/Lib/http/server.py
@@ -777,7 +777,7 @@ def list_directory(self, path):
             displaypath = urllib.parse.unquote(self.path,
                                                errors='surrogatepass')
         except UnicodeDecodeError:
-            displaypath = urllib.parse.unquote(path)
+            displaypath = urllib.parse.unquote(self.path)
         displaypath = html.escape(displaypath, quote=False)
         enc = sys.getfilesystemencoding()
         title = 'Directory listing for %s' % displaypath
diff --git a/Lib/test/test_httpservers.py b/Lib/test/test_httpservers.py
index b3e15c475a40..8c9be6890039 100644
--- a/Lib/test/test_httpservers.py
+++ b/Lib/test/test_httpservers.py
@@ -413,6 +413,14 @@ def test_undecodable_filename(self):
         self.check_status_and_reason(response, HTTPStatus.OK,
                                      data=support.TESTFN_UNDECODABLE)
 
+    def test_undecodable_parameter(self):
+        # sanity check using a valid parameter
+        response = self.request(self.base_url + '/?x=123').read()
+        self.assertRegex(response, f'listing for {self.base_url}/\?x=123'.encode('latin1'))
+        # now the bogus encoding
+        response = self.request(self.base_url + '/?x=%bb').read()
+        self.assertRegex(response, f'listing for {self.base_url}/\?x=\xef\xbf\xbd'.encode('latin1'))
+
     def test_get_dir_redirect_location_domain_injection_bug(self):
         """Ensure //evil.co/..%2f../../X does not put //evil.co/ in Location.
 
diff --git a/Misc/NEWS.d/next/Security/2023-05-01-15-03-25.gh-issue-104049.b01Y3g.rst b/Misc/NEWS.d/next/Security/2023-05-01-15-03-25.gh-issue-104049.b01Y3g.rst
new file mode 100644
index 000000000000..969deb26bfeb
--- /dev/null
+++ b/Misc/NEWS.d/next/Security/2023-05-01-15-03-25.gh-issue-104049.b01Y3g.rst
@@ -0,0 +1,2 @@
+Do not expose the local on-disk location in directory indexes
+produced by :class:`http.client.SimpleHTTPRequestHandler`.