CVE-2023-0215

Technical Description

The public API function BIO_new_NDEF is a helper function used for streaming

ASN.1 data via a BIO. It is primarily used internally to OpenSSL to support the

SMIME, CMS and PKCS7 streaming capabilities, but may also be called directly by

end user applications.

The function receives a BIO from the caller, prepends a new BIO_f_asn1 filter

BIO onto the front of it to form a BIO chain, and then returns the new head of

the BIO chain to the caller. Under certain conditions, for example if a CMS

recipient public key is invalid, the new filter BIO is freed and the function

returns a NULL result indicating a failure. However, in this case, the BIO chain

is not properly cleaned up and the BIO passed by the caller still retains

internal pointers to the previously freed filter BIO. If the caller then goes on

to call BIO_pop() on the BIO then a use-after-free will occur. This will most

likely result in a crash.

This scenario occurs directly in the internal function B64_write_ASN1() which

may cau

Remediation

Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References