CVE-2023-2975
Description
A vulnerability was found in OpenSSL. The AES-SIV cipher implementation contains a bug that causes it to ignore empty associated data entries, which are unauthenticated as a consequence. Applications that use the AES-SIV algorithm and want to authenticate empty data entries as associated data can be misled by removing, adding, or reordering such empty entries as these are ignored by the OpenSSL implementation. The AES-SIV algorithm allows for the authentication of multiple associated data entries and encryption. To authenticate empty data, the application has to call EVP_EncryptUpdate() (or EVP_CipherUpdate()) with a NULL pointer as the output buffer and 0 as the input buffer length. The AES-SIV implementation in OpenSSL returns success for such a call instead of performing the associated data authentication operation. Thus, the empty data will not be authenticated.
Statement
This issue does not affect Red Hat Enterprise Linux 6, 7, and 8 as the vulnerable OpenSSL package is currently not shipped. As this issue does not affect non-empty associated data authentication and we expect it to be rare for an application to use empty associated data entries, this is rated with a Low severity.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | 5.3 | 5.3 |
| Attack Vector | Network | Network | Network |
| Attack Complexity | Low | Low | Low |
| Privileges Required | None | None | None |
| User Interaction | None | None | None |
| Scope | Unchanged | Unchanged | Unchanged |
| Confidentiality | None | None | None |
| Integrity Impact | Low | Low | Low |
| Availability Impact | None | None | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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