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CVE-2023-49083— cryptography vulnerable to NULL-dereference when loading PKCS7 certificates

Quick assessment

Affected
pyca cryptography
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python cryptography 3.1到 41.0.6版本存在代码问题漏洞，该漏洞源于加载 PKCS7 证书时可能会导致空指针取消引用和段错误。

CVSS 5.9 · Medium EPSS 0.98% · P63

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-49083

Vulnerability Information
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Vulnerability Title
cryptography vulnerable to NULL-dereference when loading PKCS7 certificates
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
Python cryptography 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Python是Python基金会的一套开源的、面向对象的程序设计语言。该语言具有可扩展、支持模块和包、支持多种平台等特点。 Python cryptography 3.1到 41.0.6版本存在代码问题漏洞，该漏洞源于加载 PKCS7 证书时可能会导致空指针取消引用和段错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pyca cryptography >= 3.1, < 41.0.6 -

II. Public POCs for CVE-2023-49083

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III. Intelligence Information for CVE-2023-49083

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Patches & Fixes for CVE-2023-49083 (2)

Vendor Advisories for CVE-2023-49083 (1)

Mailing List Discussions for CVE-2023-49083 (2)

IV. Related Vulnerabilities

Same product: cryptography
Same vendor: pyca
Same weakness: CWE-476