From: Narpat Mali <narpat.m...@windriver.com> cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability. This vulnerability has been patched in version 41.0.6.
References: https://nvd.nist.gov/vuln/detail/CVE-2023-49083 https://security-tracker.debian.org/tracker/CVE-2023-49083 Signed-off-by: Narpat Mali <narpat.m...@windriver.com> Signed-off-by: Steve Sakoman <st...@sakoman.com> --- .../python3-cryptography/CVE-2023-49083.patch | 53 +++++++++++++++++++ .../python/python3-cryptography_36.0.2.bb | 1 + 2 files changed, 54 insertions(+) create mode 100644 meta/recipes-devtools/python/python3-cryptography/CVE-2023-49083.patch diff --git a/meta/recipes-devtools/python/python3-cryptography/CVE-2023-49083.patch b/meta/recipes-devtools/python/python3-cryptography/CVE-2023-49083.patch new file mode 100644 index 0000000000..d398eea1d9 --- /dev/null +++ b/meta/recipes-devtools/python/python3-cryptography/CVE-2023-49083.patch @@ -0,0 +1,53 @@ +From 627ac5e314303acc00a19d58f09eb1eabd029fd1 Mon Sep 17 00:00:00 2001 +From: Alex Gaynor <alex.gay...@gmail.com> +Date: Wed, 6 Dec 2023 08:04:53 +0000 +Subject: [PATCH] Fixed crash when loading a PKCS#7 bundle with no certificates + (#9926) + +CVE: CVE-2023-49083 + +Upstream-Status: Backport [https://github.com/pyca/cryptography/commit/1e7b4d074e14c4e694d3ce69ad6754a6039fd6ff] + +Signed-off-by: Narpat Mali <narpat.m...@windriver.com> +--- + src/cryptography/hazmat/backends/openssl/backend.py | 5 ++++- + tests/hazmat/primitives/test_pkcs7.py | 6 ++++++ + 2 files changed, 10 insertions(+), 1 deletion(-) + +diff --git a/src/cryptography/hazmat/backends/openssl/backend.py b/src/cryptography/hazmat/backends/openssl/backend.py +index 5606fe6..c43fea0 100644 +--- a/src/cryptography/hazmat/backends/openssl/backend.py ++++ b/src/cryptography/hazmat/backends/openssl/backend.py +@@ -2189,9 +2189,12 @@ class Backend(BackendInterface): + _Reasons.UNSUPPORTED_SERIALIZATION, + ) + ++ certs: list[x509.Certificate] = [] ++ if p7.d.sign == self._ffi.NULL: ++ return certs ++ + sk_x509 = p7.d.sign.cert + num = self._lib.sk_X509_num(sk_x509) +- certs = [] + for i in range(num): + x509 = self._lib.sk_X509_value(sk_x509, i) + self.openssl_assert(x509 != self._ffi.NULL) +diff --git a/tests/hazmat/primitives/test_pkcs7.py b/tests/hazmat/primitives/test_pkcs7.py +index 91ac842..b98a9f1 100644 +--- a/tests/hazmat/primitives/test_pkcs7.py ++++ b/tests/hazmat/primitives/test_pkcs7.py +@@ -81,6 +81,12 @@ class TestPKCS7Loading(object): + mode="rb", + ) + ++ def test_load_pkcs7_empty_certificates(self): ++ der = b"\x30\x0B\x06\x09\x2A\x86\x48\x86\xF7\x0D\x01\x07\x02" ++ ++ certificates = pkcs7.load_der_pkcs7_certificates(der) ++ assert certificates == [] ++ + + # We have no public verification API and won't be adding one until we get + # some requirements from users so this function exists to give us basic +-- +2.40.0 diff --git a/meta/recipes-devtools/python/python3-cryptography_36.0.2.bb b/meta/recipes-devtools/python/python3-cryptography_36.0.2.bb index c3ae0c1ab9..c429c75e1b 100644 --- a/meta/recipes-devtools/python/python3-cryptography_36.0.2.bb +++ b/meta/recipes-devtools/python/python3-cryptography_36.0.2.bb @@ -18,6 +18,7 @@ SRC_URI += " \ file://0002-Cargo.toml-edition-2018-2021.patch \ file://fix-leak-metric.patch \ file://CVE-2023-23931.patch \ + file://CVE-2023-49083.patch \ " inherit pypi python_setuptools3_rust -- 2.34.1
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