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.
How to fix CVE-2023-0401
To remediate CVE-2023-0401, upgrade the affected package to a fixed version below.
- —upgrade to 3.0.8-r0 or later
- —upgrade to 3.0.8-r0 or later
- —upgrade to 300.0.12 or later
- —upgrade to 300.0.12 or later
- —upgrade to 3.0.8-1 or later
Is CVE-2023-0401 being exploited?
Low — EPSS is 0.7%, meaning exploitation activity has not been observed at scale.
Affected packages (5)
- from 0, < 3.0.8-r0
- from 0, < 3.0.8-r0
- >= 300.0.0, < 300.0.12
- >= 300.0.0, < 300.0.12
- from 0, < 3.0.8-1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |