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 guidance for constructing a deterministic IV for AES in GCM mode, truncation of the counter portion could lead to IV reuse. Both truncations and overruns of the key and overruns of the IV will produce incorrect results and could, in some cases, trigger a memory exception. However, these issues are not currently assessed as security critical. Changing the key and IV lengths is not considered to be a common operation which implies the Moderate severity of this security issue.
Public now via upstream advisory: https://www.openssl.org/news/secadv/20231024.txt
Created openssl tracking bugs for this issue: Affects: fedora-37 [bug 2249064] Affects: fedora-38 [bug 2249065] Created openssl3 tracking bugs for this issue: Affects: epel-8 [bug 2249063]
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2024:0310 https://access.redhat.com/errata/RHSA-2024:0310
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Extended Update Support Via RHSA-2024:0500 https://access.redhat.com/errata/RHSA-2024:0500