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> --- .../python3-cryptography/CVE-2023-49083.patch | 53 +++++++++++++++++++ .../python/python3-cryptography_39.0.2.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..3870529ecc --- /dev/null +++ b/meta/recipes-devtools/python/python3-cryptography/CVE-2023-49083.patch @@ -0,0 +1,53 @@ +From df089065abde07b9b2666693c10f4d5c96cd99a1 Mon Sep 17 00:00:00 2001 +From: Alex Gaynor <alex.gay...@gmail.com> +Date: Thu, 7 Dec 2023 09:33:46 +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 48f4265..7b949be 100644 +--- a/src/cryptography/hazmat/backends/openssl/backend.py ++++ b/src/cryptography/hazmat/backends/openssl/backend.py +@@ -2466,9 +2466,12 @@ class Backend: + _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 d879563..36ce031 100644 +--- a/tests/hazmat/primitives/test_pkcs7.py ++++ b/tests/hazmat/primitives/test_pkcs7.py +@@ -89,6 +89,12 @@ class TestPKCS7Loading: + 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_39.0.2.bb b/meta/recipes-devtools/python/python3-cryptography_39.0.2.bb index 449e3ba1bc..b54c7e1719 100644 --- a/meta/recipes-devtools/python/python3-cryptography_39.0.2.bb +++ b/meta/recipes-devtools/python/python3-cryptography_39.0.2.bb @@ -16,6 +16,7 @@ SRC_URI += "\ file://0001-pyproject.toml-remove-benchmark-disable-option.patch \ file://check-memfree.py \ file://run-ptest \ + file://CVE-2023-49083.patch \ " require ${BPN}-crates.inc -- 2.40.0
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