CVE-2023-2975

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 misled 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.

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 misled 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.

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 misled 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.

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 misled 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.

OpenSSL is a toolkit that implements the Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols, as well as a full-strength general-purpose cryptography library.

Security Fix(es):

• openssl: AES-SIV cipher implementation contains a bug that causes it to ignore empty associated data entries (CVE-2023-2975)
• openssl: Excessive time spent checking DH keys and parameters (CVE-2023-3446)
• OpenSSL: Excessive time spent checking DH q parameter value (CVE-2023-3817)
• openssl: Generating excessively long X9.42 DH keys or checking excessively long X9.42 DH keys or parameters may be very slow (CVE-2023-5678)
• openssl: POLY1305 MAC implementation corrupts vector registers on PowerPC (CVE-2023-6129)
• openssl: Excessive time spent checking invalid RSA public keys (CVE-2023-6237)
• openssl: denial of service via null dereference (CVE-2024-0727)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

• CVE-2024-0727: Fix NULL pointer dereference in processing PKCS12 files, preventing potential DoS attack
• CVE-2023-6129: Fix POLY1305 MAC implementation bug that corrupts internal state on PowerPC CPUs with vector instructions
• CVE-2023-5678: Fix issue with excessively long X9.42 DH keys or parameters causing long delays and potential DoS by adding checks in DH_generate_key() and DH_check_pub_key() functions
• CVE-2023-3817: Fix excessively long DH key or parameters check causing potential Denial of Service by preventing unnecessary checks if q is larger than p
• CVE-2023-3446: Fix issue of excessively long DH keys or parameters causing slow checks, leading to potential Denial of Service. Added additional checks to prevent DoS vulnerability in DH_check(), DH_check_ex(), and EVP_PKEY_param_check() functions
• CVE-2023-2975: Fix issue with AES-SIV cipher ignoring empty associated data entries by performing authentication operation for empty data during EVP_EncryptUpdate()

AES-SIV implementation ignores empty associated data entries. (CVE-2023-2975)

Excessive time spent checking DH keys and parameters. (CVE-2023-3446)

Excessive time spent checking DH q parameter value. (CVE-2023-3817)

The updated packages fix security vulnerabilities:

AES-SIV implementation ignores empty associated data entries. (CVE-2023-2975)

Excessive time spent checking DH keys and parameters. (CVE-2023-3446)

Excessive time spent checking DH q parameter value. (CVE-2023-3817)

These are all security issues fixed in the libopenssl-3-devel-3.1.1-3.1 package on the GA media of openSUSE Tumbleweed.

This update for openssl-3 fixes the following issues:

• CVE-2023-2975: Fixed AES-SIV implementation ignores empty associated data entries (bsc#1213383).
• CVE-2023-3446: Fixed DH_check() excessive time with over sized modulus (bsc#1213487).

This update for openssl-3 fixes the following issues:

• CVE-2023-2975: Fixed AES-SIV implementation ignores empty associated data entries (bsc#1213383).
• CVE-2023-3446: Fixed DH_check() excessive time with over sized modulus (bsc#1213487).

Tony Battersby discovered that OpenSSL incorrectly handled key and initialization vector (IV) lengths. This could lead to truncation issues and result in loss of confidentiality for some symmetric cipher modes. (CVE-2023-5363)

Juerg Wullschleger discovered that OpenSSL incorrectly handled the AES-SIV cipher. This could lead to empty data entries being ignored, resulting in certain applications being misled. This issue only affected Ubuntu 22.04 LTS and Ubuntu 23.04. (CVE-2023-2975)

It was discovered that OpenSSL incorrectly handled checking excessively long DH keys or parameters. A remote attacker could possibly use this issue to cause OpenSSL to consume resources, leading to a denial of service. This issue only affected Ubuntu 22.04 LTS and Ubuntu 23.04. (CVE-2023-3446, CVE-2023-3817)