CVE-2023-0401

NULL dereference during PKCS7 data verification

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.95% Top 25%
Vendor Advisory openssl.org Vendor Advisory openssl.org
Affected: OpenSSL OpenSSL
Published at:
Updated at:

References

Link Tags
https://www.openssl.org/news/secadv/20230207.txt vendor advisory
https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=d3b6dfd70db844c4499bec6ad6601623a565e674 patch vendor advisory
https://security.gentoo.org/glsa/202402-08

Frequently Asked Questions

What is the severity of CVE-2023-0401?
CVE-2023-0401 has been scored as a high severity vulnerability.
How to fix CVE-2023-0401?
To fix CVE-2023-0401, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2023-0401 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-0401 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-0401?
CVE-2023-0401 affects OpenSSL OpenSSL.
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