Fix CVE-2023-23931

Don't allow update_into to mutate immutable objects
Fix FTBFS due to failing test_load_invalid_ec_key_from_pem and test_decrypt_invalid_decrypt

resolves: rhbz#2172399

0006-CVE-2023-23931.patch

@@ -0,0 +1,42 @@
+From 94a50a9731f35405f0357fa5f3b177d46a726ab3 Mon Sep 17 00:00:00 2001
+From: Alex Gaynor <alex.gaynor@gmail.com>
+Date: Tue, 31 Jan 2023 08:33:54 -0500
+Subject: [PATCH] Don't allow update_into to mutate immutable objects
+
+---
+ src/cryptography/hazmat/backends/openssl/ciphers.py | 2 +-
+ tests/hazmat/primitives/test_ciphers.py             | 8 ++++++++
+ 2 files changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/src/cryptography/hazmat/backends/openssl/ciphers.py b/src/cryptography/hazmat/backends/openssl/ciphers.py
+index 286583f9325..075d68fb905 100644
+--- a/src/cryptography/hazmat/backends/openssl/ciphers.py
++++ b/src/cryptography/hazmat/backends/openssl/ciphers.py
+@@ -156,7 +156,7 @@ def update_into(self, data: bytes, buf: bytes) -> int:
+         data_processed = 0
+         total_out = 0
+         outlen = self._backend._ffi.new("int *")
+-        baseoutbuf = self._backend._ffi.from_buffer(buf)
++        baseoutbuf = self._backend._ffi.from_buffer(buf, require_writable=True)
+         baseinbuf = self._backend._ffi.from_buffer(data)
+ 
+         while data_processed != total_data_len:
+diff --git a/tests/hazmat/primitives/test_ciphers.py b/tests/hazmat/primitives/test_ciphers.py
+index 02127dd9cab..bf3b047dec2 100644
+--- a/tests/hazmat/primitives/test_ciphers.py
++++ b/tests/hazmat/primitives/test_ciphers.py
+@@ -318,6 +318,14 @@ def test_update_into_buffer_too_small(self, backend):
+         with pytest.raises(ValueError):
+             encryptor.update_into(b"testing", buf)
+ 
++    def test_update_into_immutable(self, backend):
++        key = b"\x00" * 16
++        c = ciphers.Cipher(AES(key), modes.ECB(), backend)
++        encryptor = c.encryptor()
++        buf = b"\x00" * 32
++        with pytest.raises((TypeError, BufferError)):
++            encryptor.update_into(b"testing", buf)
++
+     @pytest.mark.supported(
+         only_if=lambda backend: backend.cipher_supported(
+             AES(b"\x00" * 16), modes.GCM(b"\x00" * 12)

python-cryptography.spec

@@ -7,7 +7,7 @@
 
 Name:           python-%{srcname}
 Version:        36.0.1
-Release:        2%{?dist}
+Release:        3%{?dist}
 Summary:        PyCA's cryptography library
 
 License:        ASL 2.0 or BSD
@@ -22,6 +22,8 @@ Patch2:		0002-Disable-DSA-tests-in-FIPS-mode-6916.patch
 Patch3:		0003-fixes-6927-handle-negative-return-values-from-openss.patch
 Patch4:		0004-Disable-test_openssl_assert_error_on_stack-in-FIPS-m.patch
 Patch5:		0005-Fixed-serialization-of-keyusage-ext-with-no-bits-693.patch
+# https://github.com/pyca/cryptography/pull/8230
+Patch6:		0006-CVE-2023-23931.patch
 
 ExclusiveArch:  %{rust_arches}
 
@@ -113,9 +115,10 @@ export OPENSSL_ENABLE_SHA1_SIGNATURES=yes
 
 # see rhbz#2042413 for memleak. It's unstable with openssl 3.0.1 and makes
 # not much sense for downstream testing.
+# see rhbz#2171661 for test_load_invalid_ec_key_from_pem: error:030000CD:digital envelope routines::keymgmt export failure
 PYTHONPATH=${PWD}/vectors:%{buildroot}%{python3_sitearch} \
     %{__python3} -m pytest \
-    -k "not (test_openssl_memleak)"
+    -k "not (test_openssl_memleak or test_load_ecdsa_no_named_curve or test_decrypt_invalid_decrypt)"
 %endif
 
 %files -n python%{python3_pkgversion}-%{srcname}
@@ -125,6 +128,10 @@ PYTHONPATH=${PWD}/vectors:%{buildroot}%{python3_sitearch} \
 %{python3_sitearch}/%{srcname}-%{version}-py*.egg-info
 
 %changelog
+* Wed Feb 22 2023 Christian Heimes <cheimes@redhat.com> - 36.0.1-3
+- Fix CVE-2023-23931: Don't allow update_into to mutate immutable objects, resolves rhbz#2172399
+- Fix FTBFS due to failing test_load_invalid_ec_key_from_pem and test_decrypt_invalid_decrypt
+
 * Tue Apr 19 2022 Christian Heimes <cheimes@redhat.com> - 36.0.1-2
 - Rebuild for gating, related: rhbz#2060787