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python36
CVE-2024-9287-venv_path_unquoted.patch
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File CVE-2024-9287-venv_path_unquoted.patch of Package python36
From c9571a53dfb9b12ba63e0e4ad3c24b7c96940298 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Mat=C4=9Bj=20Cepl?= <mcepl@cepl.eu> Date: Tue, 5 Nov 2024 15:57:57 +0100 Subject: [PATCH] [CVE-2024-9287] properly quote path names provided when creating a venv This patch properly quotes template strings in venv activation scripts. This mitigates potential command injection. Fixes: bsc#1232241 (CVE-2024-9287) Fixes: gh#python/cpython#124651 Co-authored-by: y5c4l3 <y5c4l3@proton.me> Co-authored-by: Victor Stinner <vstinner@python.org> From-PR: gh#python/cpython!124712 Patch: CVE-2024-9287-venv_path_unquoted.patch --- Lib/test/test_venv.py | 82 ++++++++++ Lib/venv/__init__.py | 42 ++++- Lib/venv/scripts/common/activate | 6 Lib/venv/scripts/posix/activate.csh | 6 Lib/venv/scripts/posix/activate.fish | 6 Misc/NEWS.d/next/Library/2024-09-28-02-03-04.gh-issue-124651.bLBGtH.rst | 1 6 files changed, 129 insertions(+), 14 deletions(-) create mode 100644 Misc/NEWS.d/next/Library/2024-09-28-02-03-04.gh-issue-124651.bLBGtH.rst --- a/Lib/test/test_venv.py +++ b/Lib/test/test_venv.py @@ -9,10 +9,12 @@ import ensurepip import os import os.path import re +import shutil import struct import subprocess import sys import tempfile +import shlex from test.support import (captured_stdout, captured_stderr, requires_zlib, can_symlink, EnvironmentVarGuard, rmtree) import unittest @@ -80,6 +82,10 @@ class BaseTest(unittest.TestCase): result = f.read() return result + def assertEndsWith(self, string, tail): + if not string.endswith(tail): + self.fail(f"String {string!r} does not end with {tail!r}") + class BasicTest(BaseTest): """Test venv module functionality.""" @@ -293,6 +299,82 @@ class BasicTest(BaseTest): 'import sys; print(sys.executable)']) self.assertEqual(out.strip(), envpy.encode()) + # gh-124651: test quoted strings + @unittest.skipIf(os.name == 'nt', 'contains invalid characters on Windows') + def test_special_chars_bash(self): + """ + Test that the template strings are quoted properly (bash) + """ + rmtree(self.env_dir) + bash = shutil.which('bash') + if bash is None: + self.skipTest('bash required for this test') + env_name = '"\';&&$e|\'"' + env_dir = os.path.join(os.path.realpath(self.env_dir), env_name) + builder = venv.EnvBuilder(clear=True) + builder.create(env_dir) + activate = os.path.join(env_dir, self.bindir, 'activate') + test_script = os.path.join(self.env_dir, 'test_special_chars.sh') + with open(test_script, "w") as f: + f.write(f'source {shlex.quote(activate)}\n' + 'python -c \'import sys; print(sys.executable)\'\n' + 'python -c \'import os; print(os.environ["VIRTUAL_ENV"])\'\n' + 'deactivate\n') + out, err = check_output([bash, test_script]) + lines = out.splitlines() + self.assertTrue(env_name.encode() in lines[0]) + self.assertEndsWith(lines[1], env_name.encode()) + + # gh-124651: test quoted strings + @unittest.skipIf(os.name == 'nt', 'contains invalid characters on Windows') + def test_special_chars_csh(self): + """ + Test that the template strings are quoted properly (csh) + """ + rmtree(self.env_dir) + csh = shutil.which('tcsh') or shutil.which('csh') + if csh is None: + self.skipTest('csh required for this test') + env_name = '"\';&&$e|\'"' + env_dir = os.path.join(os.path.realpath(self.env_dir), env_name) + builder = venv.EnvBuilder(clear=True) + builder.create(env_dir) + activate = os.path.join(env_dir, self.bindir, 'activate.csh') + test_script = os.path.join(self.env_dir, 'test_special_chars.csh') + with open(test_script, "w") as f: + f.write(f'source {shlex.quote(activate)}\n' + 'python -c \'import sys; print(sys.executable)\'\n' + 'python -c \'import os; print(os.environ["VIRTUAL_ENV"])\'\n' + 'deactivate\n') + out, err = check_output([csh, test_script]) + lines = out.splitlines() + self.assertTrue(env_name.encode() in lines[0]) + self.assertEndsWith(lines[1], env_name.encode()) + + # gh-124651: test quoted strings on Windows + @unittest.skipUnless(os.name == 'nt', 'only relevant on Windows') + def test_special_chars_windows(self): + """ + Test that the template strings are quoted properly on Windows + """ + rmtree(self.env_dir) + env_name = "'&&^$e" + env_dir = os.path.join(os.path.realpath(self.env_dir), env_name) + builder = venv.EnvBuilder(clear=True) + builder.create(env_dir) + activate = os.path.join(env_dir, self.bindir, 'activate.bat') + test_batch = os.path.join(self.env_dir, 'test_special_chars.bat') + with open(test_batch, "w") as f: + f.write('@echo off\n' + f'"{activate}" & ' + f'{self.exe} -c "import sys; print(sys.executable)" & ' + f'{self.exe} -c "import os; print(os.environ[\'VIRTUAL_ENV\'])" & ' + 'deactivate') + out, err = check_output([test_batch]) + lines = out.splitlines() + self.assertTrue(env_name.encode() in lines[0]) + self.assertEndsWith(lines[1], env_name.encode()) + @unittest.skipUnless(os.name == 'nt', 'only relevant on Windows') def test_unicode_in_batch_file(self): """ --- a/Lib/venv/__init__.py +++ b/Lib/venv/__init__.py @@ -10,6 +10,7 @@ import shutil import subprocess import sys import types +import shlex logger = logging.getLogger(__name__) @@ -280,11 +281,41 @@ class EnvBuilder: :param context: The information for the environment creation request being processed. """ - text = text.replace('__VENV_DIR__', context.env_dir) - text = text.replace('__VENV_NAME__', context.env_name) - text = text.replace('__VENV_PROMPT__', context.prompt) - text = text.replace('__VENV_BIN_NAME__', context.bin_name) - text = text.replace('__VENV_PYTHON__', context.env_exe) + replacements = { + '__VENV_DIR__': context.env_dir, + '__VENV_NAME__': context.env_name, + '__VENV_PROMPT__': context.prompt, + '__VENV_BIN_NAME__': context.bin_name, + '__VENV_PYTHON__': context.env_exe, + } + + def quote_ps1(s): + """ + This should satisfy PowerShell quoting rules [1], unless the quoted + string is passed directly to Windows native commands [2]. + [1]: https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_quoting_rules + [2]: https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_parsing#passing-arguments-that-contain-quote-characters + """ + s = s.replace("'", "''") + return f"'{s}'" + + def quote_bat(s): + return s + + # gh-124651: need to quote the template strings properly + quote = shlex.quote + script_path = context.script_path + if script_path.endswith('.ps1'): + quote = quote_ps1 + elif script_path.endswith('.bat'): + quote = quote_bat + else: + # fallbacks to POSIX shell compliant quote + quote = shlex.quote + + replacements = {key: quote(s) for key, s in replacements.items()} + for key, quoted in replacements.items(): + text = text.replace(key, quoted) return text def install_scripts(self, context, path): @@ -321,6 +352,7 @@ class EnvBuilder: with open(srcfile, 'rb') as f: data = f.read() if not srcfile.endswith('.exe'): + context.script_path = srcfile try: data = data.decode('utf-8') data = self.replace_variables(data, context) --- a/Lib/venv/scripts/common/activate +++ b/Lib/venv/scripts/common/activate @@ -37,11 +37,11 @@ deactivate () { # unset irrelevant variables deactivate nondestructive -VIRTUAL_ENV="__VENV_DIR__" +VIRTUAL_ENV=__VENV_DIR__ export VIRTUAL_ENV _OLD_VIRTUAL_PATH="$PATH" -PATH="$VIRTUAL_ENV/__VENV_BIN_NAME__:$PATH" +PATH="$VIRTUAL_ENV/"__VENV_BIN_NAME__":$PATH" export PATH # unset PYTHONHOME if set @@ -55,7 +55,7 @@ fi if [ -z "${VIRTUAL_ENV_DISABLE_PROMPT:-}" ] ; then _OLD_VIRTUAL_PS1="${PS1:-}" if [ "x__VENV_PROMPT__" != x ] ; then - PS1="__VENV_PROMPT__${PS1:-}" + PS1=__VENV_PROMPT__"${PS1:-}" else if [ "`basename \"$VIRTUAL_ENV\"`" = "__" ] ; then # special case for Aspen magic directories --- a/Lib/venv/scripts/posix/activate.csh +++ b/Lib/venv/scripts/posix/activate.csh @@ -8,17 +8,17 @@ alias deactivate 'test $?_OLD_VIRTUAL_PA # Unset irrelevant variables. deactivate nondestructive -setenv VIRTUAL_ENV "__VENV_DIR__" +setenv VIRTUAL_ENV __VENV_DIR__ set _OLD_VIRTUAL_PATH="$PATH" -setenv PATH "$VIRTUAL_ENV/__VENV_BIN_NAME__:$PATH" +setenv PATH "$VIRTUAL_ENV/"__VENV_BIN_NAME__":$PATH" set _OLD_VIRTUAL_PROMPT="$prompt" if (! "$?VIRTUAL_ENV_DISABLE_PROMPT") then if ("__VENV_NAME__" != "") then - set env_name = "__VENV_NAME__" + set env_name = __VENV_NAME__ else if (`basename "VIRTUAL_ENV"` == "__") then # special case for Aspen magic directories --- a/Lib/venv/scripts/posix/activate.fish +++ b/Lib/venv/scripts/posix/activate.fish @@ -29,10 +29,10 @@ end # unset irrelevant variables deactivate nondestructive -set -gx VIRTUAL_ENV "__VENV_DIR__" +set -gx VIRTUAL_ENV __VENV_DIR__ set -gx _OLD_VIRTUAL_PATH $PATH -set -gx PATH "$VIRTUAL_ENV/__VENV_BIN_NAME__" $PATH +set -gx PATH "$VIRTUAL_ENV/"__VENV_BIN_NAME__ $PATH # unset PYTHONHOME if set if set -q PYTHONHOME @@ -53,7 +53,7 @@ if test -z "$VIRTUAL_ENV_DISABLE_PROMPT" # Prompt override? if test -n "__VENV_PROMPT__" - printf "%s%s" "__VENV_PROMPT__" (set_color normal) + printf "%s%s" __VENV_PROMPT__ (set_color normal) else # ...Otherwise, prepend env set -l _checkbase (basename "$VIRTUAL_ENV") --- /dev/null +++ b/Misc/NEWS.d/next/Library/2024-09-28-02-03-04.gh-issue-124651.bLBGtH.rst @@ -0,0 +1 @@ +Properly quote template strings in :mod:`venv` activation scripts.
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