From 7b56ef7ebe23bfe8321e9732b75ef15049820682 Mon Sep 17 00:00:00 2001 From: Charalampos Stratakis Date: Fri, 30 Jun 2023 12:32:35 +0200 Subject: [PATCH] Security fix for CVE-2007-4559 Resolves: rhbz#263261 --- 00397-tarfile-filter.patch | 251 +++++++++++++++++++++++++++++++++++++ python3.11.spec | 12 +- 2 files changed, 262 insertions(+), 1 deletion(-) create mode 100644 00397-tarfile-filter.patch diff --git a/00397-tarfile-filter.patch b/00397-tarfile-filter.patch new file mode 100644 index 0000000..9297ea5 --- /dev/null +++ b/00397-tarfile-filter.patch @@ -0,0 +1,251 @@ +From 363474312808642b23840a26b4e812051a551e48 Mon Sep 17 00:00:00 2001 +From: Petr Viktorin +Date: Mon, 6 Mar 2023 17:24:24 +0100 +Subject: [PATCH] CVE-2007-4559, PEP-706: Add filters for tarfile extraction + (downstream) + +Add and test RHEL-specific ways of configuring the default behavior: environment +variable and config file. +--- + Lib/tarfile.py | 42 +++++++++++++ + Lib/test/test_shutil.py | 3 +- + Lib/test/test_tarfile.py | 128 ++++++++++++++++++++++++++++++++++++++- + 3 files changed, 169 insertions(+), 4 deletions(-) + +diff --git a/Lib/tarfile.py b/Lib/tarfile.py +index 130b5e0..3b7d8d5 100755 +--- a/Lib/tarfile.py ++++ b/Lib/tarfile.py +@@ -72,6 +72,13 @@ __all__ = ["TarFile", "TarInfo", "is_tarfile", "TarError", "ReadError", + "ENCODING", "USTAR_FORMAT", "GNU_FORMAT", "PAX_FORMAT", + "DEFAULT_FORMAT", "open"] + ++# If true, use the safer (but backwards-incompatible) 'tar' extraction filter, ++# rather than 'fully_trusted', by default. ++# The emitted warning is changed to match. ++_RH_SAFER_DEFAULT = True ++ ++# System-wide configuration file ++_CONFIG_FILENAME = '/etc/python/tarfile.cfg' + + #--------------------------------------------------------- + # tar constants +@@ -2211,6 +2218,41 @@ class TarFile(object): + if filter is None: + filter = self.extraction_filter + if filter is None: ++ name = os.environ.get('PYTHON_TARFILE_EXTRACTION_FILTER') ++ if name is None: ++ try: ++ file = bltn_open(_CONFIG_FILENAME) ++ except FileNotFoundError: ++ pass ++ else: ++ import configparser ++ conf = configparser.ConfigParser( ++ interpolation=None, ++ comment_prefixes=('#', ), ++ ) ++ with file: ++ conf.read_file(file) ++ name = conf.get('tarfile', ++ 'PYTHON_TARFILE_EXTRACTION_FILTER', ++ fallback='') ++ if name: ++ try: ++ filter = _NAMED_FILTERS[name] ++ except KeyError: ++ raise ValueError(f"filter {filter!r} not found") from None ++ self.extraction_filter = filter ++ return filter ++ if _RH_SAFER_DEFAULT: ++ warnings.warn( ++ 'The default behavior of tarfile extraction has been ' ++ + 'changed to disallow common exploits ' ++ + '(including CVE-2007-4559). ' ++ + 'By default, absolute/parent paths are disallowed ' ++ + 'and some mode bits are cleared. ' ++ + 'See https://access.redhat.com/articles/7004769 ' ++ + 'for more details.', ++ RuntimeWarning) ++ return tar_filter + return fully_trusted_filter + if isinstance(filter, str): + raise TypeError( +diff --git a/Lib/test/test_shutil.py b/Lib/test/test_shutil.py +index 9bf4145..f247b82 100644 +--- a/Lib/test/test_shutil.py ++++ b/Lib/test/test_shutil.py +@@ -1665,7 +1665,8 @@ class TestArchives(BaseTest, unittest.TestCase): + def check_unpack_tarball(self, format): + self.check_unpack_archive(format, filter='fully_trusted') + self.check_unpack_archive(format, filter='data') +- with warnings_helper.check_no_warnings(self): ++ with warnings_helper.check_warnings( ++ ('.*CVE-2007-4559', RuntimeWarning)): + self.check_unpack_archive(format) + + def test_unpack_archive_tar(self): +diff --git a/Lib/test/test_tarfile.py b/Lib/test/test_tarfile.py +index cdea033..4724285 100644 +--- a/Lib/test/test_tarfile.py ++++ b/Lib/test/test_tarfile.py +@@ -2,7 +2,7 @@ import sys + import os + import io + from hashlib import sha256 +-from contextlib import contextmanager ++from contextlib import contextmanager, ExitStack + from random import Random + import pathlib + import shutil +@@ -2999,7 +2999,11 @@ class NoneInfoExtractTests(ReadTest): + tar = tarfile.open(tarname, mode='r', encoding="iso8859-1") + cls.control_dir = pathlib.Path(TEMPDIR) / "extractall_ctrl" + tar.errorlevel = 0 +- tar.extractall(cls.control_dir, filter=cls.extraction_filter) ++ with ExitStack() as cm: ++ if cls.extraction_filter is None: ++ cm.enter_context(warnings.catch_warnings()) ++ warnings.simplefilter(action="ignore", category=RuntimeWarning) ++ tar.extractall(cls.control_dir, filter=cls.extraction_filter) + tar.close() + cls.control_paths = set( + p.relative_to(cls.control_dir) +@@ -3674,7 +3678,8 @@ class TestExtractionFilters(unittest.TestCase): + """Ensure the default filter does not warn (like in 3.12)""" + with ArchiveMaker() as arc: + arc.add('foo') +- with warnings_helper.check_no_warnings(self): ++ with warnings_helper.check_warnings( ++ ('.*CVE-2007-4559', RuntimeWarning)): + with self.check_context(arc.open(), None): + self.expect_file('foo') + +@@ -3844,6 +3849,123 @@ class TestExtractionFilters(unittest.TestCase): + self.expect_exception(TypeError) # errorlevel is not int + + ++ @contextmanager ++ def rh_config_context(self, config_lines=None): ++ """Set up for testing various ways of overriding the default filter ++ ++ return a triple with: ++ - temporary directory ++ - EnvironmentVarGuard() ++ - a test archive for use with check_* methods below ++ ++ If config_lines is given, write them to the config file. Otherwise ++ the config file is missing. ++ """ ++ tempdir = pathlib.Path(TEMPDIR) / 'tmp' ++ configfile = tempdir / 'tarfile.cfg' ++ with ArchiveMaker() as arc: ++ arc.add('good') ++ arc.add('ugly', symlink_to='/etc/passwd') ++ arc.add('../bad') ++ with ( ++ os_helper.temp_dir(tempdir), ++ support.swap_attr(tarfile, '_CONFIG_FILENAME', str(configfile)), ++ os_helper.EnvironmentVarGuard() as env, ++ arc.open() as tar, ++ ): ++ if config_lines is not None: ++ with configfile.open('w') as f: ++ for line in config_lines: ++ print(line, file=f) ++ yield tempdir, env, tar ++ ++ def check_rh_default_behavior(self, tar, tempdir): ++ """Check RH default: warn and refuse to extract dangerous files.""" ++ with ( ++ warnings_helper.check_warnings( ++ ('.*CVE-2007-4559', RuntimeWarning)), ++ self.assertRaises(tarfile.OutsideDestinationError), ++ ): ++ tar.extractall(tempdir / 'outdir') ++ ++ def check_trusted_default(self, tar, tempdir): ++ """Check 'fully_trusted' is configured as the default filter.""" ++ with ( ++ warnings_helper.check_no_warnings(self), ++ ): ++ tar.extractall(tempdir / 'outdir') ++ self.assertTrue((tempdir / 'outdir/good').exists()) ++ self.assertEqual((tempdir / 'outdir/ugly').readlink(), ++ pathlib.Path('/etc/passwd')) ++ self.assertTrue((tempdir / 'bad').exists()) ++ ++ def test_rh_default_no_conf(self): ++ with self.rh_config_context() as (tempdir, env, tar): ++ self.check_rh_default_behavior(tar, tempdir) ++ ++ def test_rh_default_from_file(self): ++ lines = ['[tarfile]', 'PYTHON_TARFILE_EXTRACTION_FILTER=fully_trusted'] ++ with self.rh_config_context(lines) as (tempdir, env, tar): ++ self.check_trusted_default(tar, tempdir) ++ ++ def test_rh_empty_config_file(self): ++ """Empty config file -> default behavior""" ++ lines = [] ++ with self.rh_config_context(lines) as (tempdir, env, tar): ++ self.check_rh_default_behavior(tar, tempdir) ++ ++ def test_empty_config_section(self): ++ """Empty section in config file -> default behavior""" ++ lines = ['[tarfile]'] ++ with self.rh_config_context(lines) as (tempdir, env, tar): ++ self.check_rh_default_behavior(tar, tempdir) ++ ++ def test_rh_default_empty_config_option(self): ++ """Empty option value in config file -> default behavior""" ++ lines = ['[tarfile]', 'PYTHON_TARFILE_EXTRACTION_FILTER='] ++ with self.rh_config_context(lines) as (tempdir, env, tar): ++ self.check_rh_default_behavior(tar, tempdir) ++ ++ def test_bad_config_option(self): ++ """Bad option value in config file -> ValueError""" ++ lines = ['[tarfile]', 'PYTHON_TARFILE_EXTRACTION_FILTER=unknown!'] ++ with self.rh_config_context(lines) as (tempdir, env, tar): ++ with self.assertRaises(ValueError): ++ tar.extractall(tempdir / 'outdir') ++ ++ def test_default_from_envvar(self): ++ with self.rh_config_context() as (tempdir, env, tar): ++ env['PYTHON_TARFILE_EXTRACTION_FILTER'] = 'fully_trusted' ++ self.check_trusted_default(tar, tempdir) ++ ++ def test_empty_envvar(self): ++ """Empty env variable -> default behavior""" ++ with self.rh_config_context() as (tempdir, env, tar): ++ env['PYTHON_TARFILE_EXTRACTION_FILTER'] = '' ++ self.check_rh_default_behavior(tar, tempdir) ++ ++ def test_bad_envvar(self): ++ with self.rh_config_context() as (tempdir, env, tar): ++ env['PYTHON_TARFILE_EXTRACTION_FILTER'] = 'unknown!' ++ with self.assertRaises(ValueError): ++ tar.extractall(tempdir / 'outdir') ++ ++ def test_envvar_overrides_file(self): ++ lines = ['[tarfile]', 'PYTHON_TARFILE_EXTRACTION_FILTER=data'] ++ with self.rh_config_context(lines) as (tempdir, env, tar): ++ env['PYTHON_TARFILE_EXTRACTION_FILTER'] = 'fully_trusted' ++ self.check_trusted_default(tar, tempdir) ++ ++ def test_monkeypatch_overrides_envvar(self): ++ with self.rh_config_context(None) as (tempdir, env, tar): ++ env['PYTHON_TARFILE_EXTRACTION_FILTER'] = 'data' ++ with support.swap_attr( ++ tarfile.TarFile, 'extraction_filter', ++ staticmethod(tarfile.fully_trusted_filter) ++ ): ++ self.check_trusted_default(tar, tempdir) ++ ++ + def setUpModule(): + os_helper.unlink(TEMPDIR) + os.makedirs(TEMPDIR) +-- +2.41.0 + diff --git a/python3.11.spec b/python3.11.spec index 0d32214..c70fb3b 100644 --- a/python3.11.spec +++ b/python3.11.spec @@ -20,7 +20,7 @@ URL: https://www.python.org/ #global prerel ... %global upstream_version %{general_version}%{?prerel} Version: %{general_version}%{?prerel:~%{prerel}} -Release: 1%{?dist} +Release: 2%{?dist} License: Python @@ -358,6 +358,12 @@ Patch371: 00371-revert-bpo-1596321-fix-threading-_shutdown-for-the-main-thread-g # Upstream: https://bugs.python.org/issue46811 Patch378: 00378-support-expat-2-4-5.patch +# 00397 # +# Add Red Hat configuration for tarfile extraction (CVE-2007-4559, PEP-706) +# See KB for documentation: +# - https://access.redhat.com/articles/7004769 +Patch397: 00397-tarfile-filter.patch + # (New patches go here ^^^) # # When adding new patches to "python" and "python3" in Fedora, EL, etc., @@ -1799,6 +1805,10 @@ fi # ====================================================== %changelog +* Fri Jun 30 2023 Charalampos Stratakis - 3.11.4-2 +- Security fix for CVE-2007-4559 +Resolves: rhbz#263261 + * Mon Jun 26 2023 Charalampos Stratakis - 3.11.4-1 - Update to 3.11.4 - Security fix for CVE-2023-24329