openssl: CVE-2023-2975

Debian Bug report logs - #1041818
openssl: CVE-2023-2975

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Salvatore Bonaccorso <carnil@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: openssl: CVE-2023-2975

Date: Sun, 23 Jul 2023 22:48:46 +0200

Source: openssl
Version: 3.0.9-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@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

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