CVE-2023-5363

/// Technical description

Issue summary: A bug has been identified in the processing of key and

initialisation vector (IV) lengths. This can lead to potential truncation

or overruns during the initialisation of some symmetric ciphers.

Impact summary: A truncation in the IV can result in non-uniqueness,

which could result in loss of confidentiality for some cipher modes.

When calling EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() or

EVP_CipherInit_ex2() the provided OSSL_PARAM array is processed after

the key and IV have been established. Any alterations to the key length,

via the "keylen" parameter or the IV length, via the "ivlen" parameter,

within the OSSL_PARAM array will not take effect as intended, potentially

causing truncation or overreading of these values. The following ciphers

and cipher modes are impacted: RC2, RC4, RC5, CCM, GCM and OCB.

For the CCM, GCM and OCB cipher modes, truncation of the IV can result in

loss of confidentiality. For example, when following NIST's SP 800-38D

section 8.2.1

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. 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.

/// References