Source: openssl Version: 3.0.9-1 Severity: important Tags: security upstream X-Debbugs-Cc: car...@debian.org, Debian Security Team <t...@security.debian.org>
Hi, The following vulnerability was published for openssl. CVE-2023-2975[0]: | 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. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2023-2975 https://www.cve.org/CVERecord?id=CVE-2023-2975 [1] https://www.openssl.org/news/secadv/20230714.txt Regards, Salvatore
