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Update to 3.8.17

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Security fix for CVE-2023-24329

Add filters for tarfile extraction (CVE-2007-4559, PEP-706)

Resolves: rhbz#2173917, rhbz#263261
This commit is contained in:
Charalampos Stratakis 2023-08-07 12:04:56 +02:00
parent 877eff0ecc
commit 67d67ac4d3
4 changed files with 267 additions and 7 deletions
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2
00189-use-rpm-wheels.patch
View File

@ -29,7 +29,7 @@ index b291e9a..798d0f4 100644
__all__ = ["version", "bootstrap"]
_PACKAGE_NAMES = ('setuptools', 'pip')
-_SETUPTOOLS_VERSION = "56.0.0"
-_PIP_VERSION = "22.0.4"
-_PIP_VERSION = "23.0.1"
+
+_WHEEL_DIR = "/usr/share/python38-wheels/"
+

247
00397-tarfile-filter.patch Normal file
View File

@ -0,0 +1,247 @@
From dc84087083c5ad99a5016e8349c96d9654a08f46 Mon Sep 17 00:00:00 2001
From: Petr Viktorin <encukou@gmail.com>
Date: Mon, 6 Mar 2023 17:24:24 +0100
Subject: [PATCH 2/2] 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 | 124 ++++++++++++++++++++++++++++++++++++++-
3 files changed, 165 insertions(+), 4 deletions(-)
diff --git a/Lib/tarfile.py b/Lib/tarfile.py
index 5291622ab8e..12ab00d748a 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
@@ -2188,6 +2195,41 @@ 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 5cef59ea9c6..73fffe0fd33 100644
--- a/Lib/test/test_shutil.py
+++ b/Lib/test/test_shutil.py
@@ -1494,7 +1494,8 @@ class TestShutil(unittest.TestCase):
def check_unpack_tarball(self, format):
self.check_unpack_archive(format, filter='fully_trusted')
self.check_unpack_archive(format, filter='data')
- with support.check_no_warnings(self):
+ with support.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 03be10b1fee..15df6a9ced6 100644
--- a/Lib/test/test_tarfile.py
+++ b/Lib/test/test_tarfile.py
@@ -2,7 +2,7 @@
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
@@ -2744,7 +2744,11 @@ 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)
@@ -3407,7 +3411,8 @@ class TestExtractionFilters(unittest.TestCase):
"""Ensure the default filter does not warn (like in 3.12)"""
with ArchiveMaker() as arc:
arc.add('foo')
- with support.check_no_warnings(self):
+ with support.check_warnings(
+ ('.*CVE-2007-4559', RuntimeWarning)):
with self.check_context(arc.open(), None):
self.expect_file('foo')
@@ -3577,6 +3582,119 @@ 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 ExitStack() as cm:
+ cm.enter_context(support.temp_dir(tempdir))
+ cm.enter_context(support.swap_attr(tarfile, '_CONFIG_FILENAME', str(configfile)))
+ env = cm.enter_context(support.EnvironmentVarGuard())
+ tar = cm.enter_context(arc.open())
+ 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 ExitStack() as cm:
+ cm.enter_context(support.check_warnings(
+ ('.*CVE-2007-4559', RuntimeWarning)))
+ cm.enter_context(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 support.check_no_warnings(self):
+ tar.extractall(tempdir / 'outdir')
+ self.assertTrue((tempdir / 'outdir/good').exists())
+ self.assertEqual(os.readlink(str(tempdir / 'outdir/ugly')),
+ '/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():
support.unlink(TEMPDIR)
os.makedirs(TEMPDIR)
--
2.41.0

23
python38.spec
View File

@ -13,11 +13,11 @@ URL: https://www.python.org/
# WARNING When rebasing to a new Python version,
# remember to update the python3-docs package as well
%global general_version %{pybasever}.16
%global general_version %{pybasever}.17
#global prerel ...
%global upstream_version %{general_version}%{?prerel}
Version: %{general_version}%{?prerel:~%{prerel}}
Release: 2%{?dist}
Release: 1%{?dist}
License: Python
# Exclude i686 arch. Due to a modularity issue it's being added to the
@ -382,6 +382,12 @@ Patch359: 00359-CVE-2021-23336.patch
# 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.,
@ -505,8 +511,8 @@ Summary: Python runtime libraries
Requires: python38-setuptools-wheel
Requires: python38-pip-wheel
%else
Provides: bundled(python38-pip) = 19.2.3
Provides: bundled(python38-setuptools) = 41.2.0
Provides: bundled(python38-pip) = 23.0.1
Provides: bundled(python38-setuptools) = 56.0.0
%endif
%{?python_provide:%python_provide python38-libs}
@ -674,7 +680,7 @@ The debug runtime additionally supports debug builds of C-API extensions
Requires: python38-setuptools-wheel
Requires: python38-pip-wheel
%else
Provides: bundled(python38-pip) = 21.1.1
Provides: bundled(python38-pip) = 23.0.1
Provides: bundled(python38-setuptools) = 56.0.0
%endif
@ -739,6 +745,7 @@ rm Lib/ensurepip/_bundled/*.whl
%patch353 -p1
%patch359 -p1
%patch378 -p1
%patch397 -p1
# Remove files that should be generated by the build
# (This is after patching, so that we can use patches directly from upstream)
@ -1832,6 +1839,12 @@ fi
# ======================================================
%changelog
* Mon Aug 07 2023 Charalampos Stratakis <cstratak@redhat.com> - 3.8.17-1
- Update to 3.8.17
- Security fix for CVE-2023-24329
- Add filters for tarfile extraction (CVE-2007-4559, PEP-706)
Resolves: rhbz#2173917, rhbz#263261
* Tue Jul 18 2023 Charalampos Stratakis <cstratak@redhat.com> - 3.8.16-2
- Strip the LTO bytecode from python.o
Resolves: rhbz#2213526

2
sources
View File

@ -1 +1 @@
SHA512 (Python-3.8.16-noexe.tar.xz) = a8f2f4e1dd3423efbd3636909c1dce0486721909ebdaf68581f8a554ee7c4722b8a0c813439d48842dd41a05a5452db492350824b83cae92100453ae69686d4d
SHA512 (Python-3.8.17-noexe.tar.xz) = bce80c6c481f1c8677210f352f5a1c48bbcdbf8f5db4656c6e8bcf08ea6a66d541a837d0c4fe32fd7dd1d72e8f245c4e8b8c1cbe704e44d428a1faec7c6f46c2