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.
Published 2023-02-08 20:15:24
Updated 2024-02-04 09:15:09
View at NVD,   CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2023-0401

Probability of exploitation activity in the next 30 days: 0.32%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 70 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2023-0401

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
7.5
HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.9
3.6
nvd@nist.gov

CWE ids for CVE-2023-0401

  • A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
    Assigned by: nvd@nist.gov (Primary)

References for CVE-2023-0401

Products affected by CVE-2023-0401

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