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CVE-2023-0401— NULL dereference during PKCS7 data verification

Quick assessment

Affected
OpenSSL OpenSSL
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.

OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞。攻击者利用该漏洞导致程序崩溃，系统拒绝服务。

AI Predicted 5.5 Difficulty: Moderate EPSS 1.85% · P77

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-0401

Vulnerability Information
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Vulnerability Title
NULL dereference during PKCS7 data verification
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL pointer can be dereferenced when signatures are being verified on PKCS7 signed or signedAndEnveloped data. In case the hash algorithm used for the signature is known to the OpenSSL library but the implementation of the hash algorithm is not available the digest initialization will fail. There is a missing check for the return value from the initialization function which later leads to invalid usage of the digest API most likely leading to a crash. The unavailability of an algorithm can be caused by using FIPS enabled configuration of providers or more commonly by not loading the legacy provider. PKCS7 data is processed by the SMIME library calls and also by the time stamp (TS) library calls. The TLS implementation in OpenSSL does not call these functions however third party applications would be affected if they call these functions to verify signatures on untrusted data.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞。攻击者利用该漏洞导致程序崩溃，系统拒绝服务。
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
OpenSSL OpenSSL 3.0.0 ~ 3.0.8 -

II. Public POCs for CVE-2023-0401

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III. Intelligence Information for CVE-2023-0401

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Vendor Advisories for CVE-2023-0401 (1)

Other References for CVE-2023-0401 (1)

Same Patch Batch · OpenSSL · 2023-02-08 · 7 CVEs total

CVE-2022-4304 Timing Oracle in RSA Decryption
CVE-2022-4450 Double free after calling PEM_read_bio_ex
CVE-2023-0215 Use-after-free following BIO_new_NDEF
CVE-2023-0216 Invalid pointer dereference in d2i_PKCS7 functions
CVE-2023-0217 NULL dereference validating DSA public key
CVE-2023-0286 X.400 address type confusion in X.509 GeneralName

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL

V. Comments for CVE-2023-0401

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