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Improper Authentication Affecting openssl package, versions <3.0.10-1

0.0
medium

Snyk CVSS

    Attack Complexity Low

    Threat Intelligence

    EPSS 0.32% (71st percentile)
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NVD
5.3 medium
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SUSE
5.9 medium
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Red Hat
5.3 medium

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  • Snyk ID SNYK-DEBIANUNSTABLE-OPENSSL-5776699
  • published 15 Jul 2023
  • disclosed 14 Jul 2023
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Introduced: 14 Jul 2023

CVE-2023-2975 Open this link in a new tab
CWE-287 Open this link in a new tab

How to fix?

Upgrade Debian:unstable openssl to version 3.0.10-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

Issue summary: The AES-SIV cipher implementation contains a bug that causes it to ignore empty associated data entries which are unauthenticated as a consequence.

Impact summary: Applications that use the AES-SIV algorithm and want to authenticate empty data entries as associated data can be mislead by removing adding or reordering such empty entries as these are ignored by the OpenSSL implementation. We are currently unaware of any such applications.

The AES-SIV algorithm allows for authentication of multiple associated data entries along with the encryption. To authenticate empty data the application has to call EVP_EncryptUpdate() (or EVP_CipherUpdate()) with NULL pointer as the output buffer and 0 as the input buffer length. The AES-SIV implementation in OpenSSL just returns success for such a call instead of performing the associated data authentication operation. The empty data thus will not be authenticated.

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 qualified as Low severity issue.