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python-Django1
CVE-2021-28658.patch
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File CVE-2021-28658.patch of Package python-Django1
From cfc6ffc2c948730f98fc1376f02b3b243d3af935 Mon Sep 17 00:00:00 2001 From: Mariusz Felisiak <felisiak.mariusz@gmail.com> Date: Tue, 16 Mar 2021 10:19:00 +0100 Subject: [PATCH] [2.2.x] Fixed CVE-2021-28658 -- Fixed potential directory-traversal via uploaded files. Thanks Claude Paroz for the initial patch. Thanks Dennis Brinkrolf for the report. Maintainers note: backported from 0001-2.2.x-Fixed-CVE-2021-28658-Fixed-potential-directory.patch diff --git a/django/http/multipartparser.py b/django/http/multipartparser.py index d9e7e4313f0a..2bc9d0e518f6 100644 --- a/django/http/multipartparser.py +++ b/django/http/multipartparser.py @@ -9,6 +9,7 @@ from __future__ import unicode_literals import base64 import binascii import cgi +import os import sys from django.conf import settings @@ -211,7 +212,7 @@ class MultiPartParser(object): file_name = disposition.get('filename') if file_name: file_name = force_text(file_name, encoding, errors='replace') - file_name = self.IE_sanitize(unescape_entities(file_name)) + file_name = self.sanitize_file_name(file_name) if not file_name: continue @@ -303,9 +304,13 @@ class MultiPartParser(object): self._files.appendlist(force_text(old_field_name, self._encoding, errors='replace'), file_obj) break - def IE_sanitize(self, filename): - """Cleanup filename from Internet Explorer full paths.""" - return filename and filename[filename.rfind("\\") + 1:].strip() + def sanitize_file_name(self, file_name): + file_name = unescape_entities(file_name) + # Cleanup Windows-style path separators. + file_name = file_name[file_name.rfind('\\') + 1:].strip() + return os.path.basename(file_name) + + IE_sanitize = sanitize_file_name def _close_files(self): # Free up all file handles. diff --git a/tests/file_uploads/tests.py b/tests/file_uploads/tests.py index 5f6a50250d54..af7b82126cf6 100644 --- a/tests/file_uploads/tests.py +++ b/tests/file_uploads/tests.py @@ -27,6 +27,21 @@ UNICODE_FILENAME = 'test-0123456789_中文_Orléans.jpg' MEDIA_ROOT = sys_tempfile.mkdtemp() UPLOAD_TO = os.path.join(MEDIA_ROOT, 'test_upload') +CANDIDATE_TRAVERSAL_FILE_NAMES = [ + '/tmp/hax0rd.txt', # Absolute path, *nix-style. + 'C:\\Windows\\hax0rd.txt', # Absolute path, win-style. + 'C:/Windows/hax0rd.txt', # Absolute path, broken-style. + '\\tmp\\hax0rd.txt', # Absolute path, broken in a different way. + '/tmp\\hax0rd.txt', # Absolute path, broken by mixing. + 'subdir/hax0rd.txt', # Descendant path, *nix-style. + 'subdir\\hax0rd.txt', # Descendant path, win-style. + 'sub/dir\\hax0rd.txt', # Descendant path, mixed. + '../../hax0rd.txt', # Relative path, *nix-style. + '..\\..\\hax0rd.txt', # Relative path, win-style. + '../..\\hax0rd.txt', # Relative path, mixed. + '../hax0rd.txt', # HTML entities. +] + @override_settings(MEDIA_ROOT=MEDIA_ROOT, ROOT_URLCONF='file_uploads.urls', MIDDLEWARE=[]) class FileUploadTests(TestCase): @@ -222,22 +237,8 @@ class FileUploadTests(TestCase): # a malicious payload with an invalid file name (containing os.sep or # os.pardir). This similar to what an attacker would need to do when # trying such an attack. - scary_file_names = [ - "/tmp/hax0rd.txt", # Absolute path, *nix-style. - "C:\\Windows\\hax0rd.txt", # Absolute path, win-style. - "C:/Windows/hax0rd.txt", # Absolute path, broken-style. - "\\tmp\\hax0rd.txt", # Absolute path, broken in a different way. - "/tmp\\hax0rd.txt", # Absolute path, broken by mixing. - "subdir/hax0rd.txt", # Descendant path, *nix-style. - "subdir\\hax0rd.txt", # Descendant path, win-style. - "sub/dir\\hax0rd.txt", # Descendant path, mixed. - "../../hax0rd.txt", # Relative path, *nix-style. - "..\\..\\hax0rd.txt", # Relative path, win-style. - "../..\\hax0rd.txt" # Relative path, mixed. - ] - payload = client.FakePayload() - for i, name in enumerate(scary_file_names): + for i, name in enumerate(CANDIDATE_TRAVERSAL_FILE_NAMES): payload.write('\r\n'.join([ '--' + client.BOUNDARY, 'Content-Disposition: form-data; name="file%s"; filename="%s"' % (i, name), @@ -258,7 +259,7 @@ class FileUploadTests(TestCase): # The filenames should have been sanitized by the time it got to the view. received = json.loads(response.content.decode('utf-8')) - for i, name in enumerate(scary_file_names): + for i, name in enumerate(CANDIDATE_TRAVERSAL_FILE_NAMES): got = received["file%s" % i] self.assertEqual(got, "hax0rd.txt") @@ -544,6 +545,36 @@ class FileUploadTests(TestCase): # shouldn't differ. self.assertEqual(os.path.basename(obj.testfile.path), 'MiXeD_cAsE.txt') + def test_filename_traversal_upload(self): + os.makedirs(UPLOAD_TO, exist_ok=True) + self.addCleanup(shutil.rmtree, MEDIA_ROOT) + file_name = '../test.txt', + payload = client.FakePayload() + payload.write( + '\r\n'.join([ + '--' + client.BOUNDARY, + 'Content-Disposition: form-data; name="my_file"; ' + 'filename="%s";' % file_name, + 'Content-Type: text/plain', + '', + 'file contents.\r\n', + '\r\n--' + client.BOUNDARY + '--\r\n', + ]), + ) + r = { + 'CONTENT_LENGTH': len(payload), + 'CONTENT_TYPE': client.MULTIPART_CONTENT, + 'PATH_INFO': '/upload_traversal/', + 'REQUEST_METHOD': 'POST', + 'wsgi.input': payload, + } + response = self.client.request(**r) + result = response.json() + self.assertEqual(response.status_code, 200) + self.assertEqual(result['file_name'], 'test.txt') + self.assertIs(os.path.exists(os.path.join(MEDIA_ROOT, 'test.txt')), False) + self.assertIs(os.path.exists(os.path.join(UPLOAD_TO, 'test.txt')), True) + @override_settings(MEDIA_ROOT=MEDIA_ROOT) class DirectoryCreationTests(SimpleTestCase): @@ -597,6 +628,15 @@ class MultiParserTests(unittest.TestCase): 'CONTENT_LENGTH': '1' }, StringIO('x'), [], 'utf-8') + def test_sanitize_file_name(self): + parser = MultiPartParser({ + 'CONTENT_TYPE': 'multipart/form-data; boundary=_foo', + 'CONTENT_LENGTH': '1' + }, StringIO('x'), [], 'utf-8') + for file_name in CANDIDATE_TRAVERSAL_FILE_NAMES: + with self.subTest(file_name=file_name): + self.assertEqual(parser.sanitize_file_name(file_name), 'hax0rd.txt') + def test_rfc2231_parsing(self): test_data = ( (b"Content-Type: application/x-stuff; title*=us-ascii'en-us'This%20is%20%2A%2A%2Afun%2A%2A%2A", diff --git a/tests/file_uploads/uploadhandler.py b/tests/file_uploads/uploadhandler.py index b69cc751cb02..7ceeded74bd5 100644 --- a/tests/file_uploads/uploadhandler.py +++ b/tests/file_uploads/uploadhandler.py @@ -1,6 +1,8 @@ """ Upload handlers to test the upload API. """ +import os +from tempfile import NamedTemporaryFile from django.core.files.uploadhandler import FileUploadHandler, StopUpload @@ -35,3 +37,32 @@ class ErroringUploadHandler(FileUploadHandler): """A handler that raises an exception.""" def receive_data_chunk(self, raw_data, start): raise CustomUploadError("Oops!") + + +class TraversalUploadHandler(FileUploadHandler): + """A handler with potential directory-traversal vulnerability.""" + def __init__(self, request=None): + from .views import UPLOAD_TO + + super().__init__(request) + self.upload_dir = UPLOAD_TO + + def file_complete(self, file_size): + self.file.seek(0) + self.file.size = file_size + with open(os.path.join(self.upload_dir, self.file_name), 'wb') as fp: + fp.write(self.file.read()) + return self.file + + def new_file( + self, field_name, file_name, content_type, content_length, charset=None, + content_type_extra=None, + ): + super().new_file( + file_name, file_name, content_length, content_length, charset, + content_type_extra, + ) + self.file = NamedTemporaryFile(suffix='.upload', dir=self.upload_dir) + + def receive_data_chunk(self, raw_data, start): + self.file.write(raw_data) diff --git a/tests/file_uploads/urls.py b/tests/file_uploads/urls.py index 504554483e0d..632ab9969415 100644 --- a/tests/file_uploads/urls.py +++ b/tests/file_uploads/urls.py @@ -13,6 +13,7 @@ urlpatterns = [ url(r'^quota/broken/$', views.file_upload_quota_broken), url(r'^getlist_count/$', views.file_upload_getlist_count), url(r'^upload_errors/$', views.file_upload_errors), + url(r'^upload_traversal/$', views.file_upload_traversal_view), url(r'^filename_case/$', views.file_upload_filename_case_view), url(r'^fd_closing/(?P<access>t|f)/$', views.file_upload_fd_closing), ] diff --git a/tests/file_uploads/views.py b/tests/file_uploads/views.py index 17d4a1b0f439..365d7ba41eaa 100644 --- a/tests/file_uploads/views.py +++ b/tests/file_uploads/views.py @@ -12,7 +12,9 @@ from django.utils.encoding import force_bytes, force_str from .models import FileModel from .tests import UNICODE_FILENAME, UPLOAD_TO -from .uploadhandler import ErroringUploadHandler, QuotaUploadHandler +from .uploadhandler import ( + ErroringUploadHandler, QuotaUploadHandler, TraversalUploadHandler, +) def file_upload_view(request): @@ -166,3 +168,11 @@ def file_upload_fd_closing(request, access): if access == 't': request.FILES # Trigger file parsing. return HttpResponse('') + + +def file_upload_traversal_view(request): + request.upload_handlers.insert(0, TraversalUploadHandler()) + request.FILES # Trigger file parsing. + return JsonResponse( + {'file_name': request.upload_handlers[0].file_name}, + )
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