[USN-6450-1] OpenSSL vulnerabilities

Marc Deslauriers marc.deslauriers at canonical.com
Tue Oct 24 16:16:02 UTC 2023

Ubuntu Security Notice USN-6450-1
October 24, 2023

openssl vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.10
- Ubuntu 23.04
- Ubuntu 22.04 LTS


Several security issues were fixed in OpenSSL.

Software Description:
- openssl: Secure Socket Layer (SSL) cryptographic library and tools


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.

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,

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 23.10:
   libssl3                         3.0.10-1ubuntu2.1

Ubuntu 23.04:
   libssl3                         3.0.8-1ubuntu1.4

Ubuntu 22.04 LTS:
   libssl3                         3.0.2-0ubuntu1.12

After a standard system update you need to reboot your computer to make
all the necessary changes.

   CVE-2023-2975, CVE-2023-3446, CVE-2023-3817, CVE-2023-5363

Package Information:

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