CVE-2023-5363

A flaw was found in OpenSSL in how it processes key and initialization vector (IV) lengths. This issue can lead to potential truncation or overruns during the initialization of some symmetric ciphers. A truncation in the IV can result in non-uniqueness, which could result in loss of confidentiality for some cipher modes. Both truncations and overruns of the key and the IV will produce incorrect results and could, in some cases, trigger a memory exception.

The identified bug in the processing of key and initialization vector (IV) lengths within certain symmetric cipher modes poses a moderate severity risk due to its potential impact on data confidentiality and integrity. While the truncation or overreading of key and IV lengths could lead to incorrect cryptographic operations and potential memory exceptions, the probability of exploitation is mitigated by several factors. Firstly, the affected API was recently introduced, limiting its widespread adoption. Secondly, altering key and IV lengths is not a common operation in most cryptographic implementations. Furthermore, the likelihood of vulnerability is reduced by the necessity for both communication peers to be similarly affected for decryption failures to occur, which would likely be detected during testing.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.