python3-cryptography: fix CVE-2023-23931

Upstream-Status: Backport
[https://github.com/pyca/cryptography/commit/9fbf84efc861668755ab645530ec7be9cf3c6696]

Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

2 files changed, 46 insertions, 0 deletions

diff --git a/meta-python/recipes-devtools/python/python3-cryptography/CVE-2023-23931.patch b/meta-python/recipes-devtools/python/python3-cryptography/CVE-2023-23931.patch
new file mode 100644
index 0000000000..6ef50a0084
--- /dev/null
+++ b/meta-python/recipes-devtools/python/python3-cryptography/CVE-2023-23931.patch
@@ -0,0 +1,45 @@
+From 9fbf84efc861668755ab645530ec7be9cf3c6696 Mon Sep 17 00:00:00 2001
+From: Alex Gaynor <alex.gaynor@gmail.com>
+Date: Tue, 7 Feb 2023 11:34:18 -0500
+Subject: [PATCH] Don't allow update_into to mutate immutable objects (#8230)
+
+Upstream-Status: Backport [https://github.com/pyca/cryptography/commit/9fbf84efc861668755ab645530ec7be9cf3c6696]
+CVE: CVE-2023-23931
+Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
+---
+ 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)
diff --git a/meta-python/recipes-devtools/python/python3-cryptography_2.8.bb b/meta-python/recipes-devtools/python/python3-cryptography_2.8.bb
index e50c97df45..e4d69fa5aa 100644
--- a/meta-python/recipes-devtools/python/python3-cryptography_2.8.bb
+++ b/meta-python/recipes-devtools/python/python3-cryptography_2.8.bb
@@ -14,6 +14,7 @@ SRC_URI += " \
     file://0001-chunked-update_into-5419.patch \
     file://0002-chunking-didn-t-actually-work-5499.patch \
     file://0003-correct-buffer-overflows-cause-by-integer-overflow-i.patch \
+    file://CVE-2023-23931.patch \
 "
 
 inherit pypi setuptools3