==========================================================================
Ubuntu Security Notice USN-6663-1
February 27, 2024

openssl update
==========================================================================

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

- Ubuntu 23.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

Add implicit rejection in PKCS#1 v1.5 in OpenSSL.

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

Details:

As a security improvement, this update prevents OpenSSL
from returning an error when detecting wrong padding
in PKCS#1 v1.5 RSA, to prevent its use in possible
Bleichenbacher timing attacks.

Update instructions:

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

Ubuntu 23.10:
   libssl-doc                      3.0.10-1ubuntu2.3
   libssl3                         3.0.10-1ubuntu2.3
   openssl                         3.0.10-1ubuntu2.3

Ubuntu 22.04 LTS:
   libssl-doc                      3.0.2-0ubuntu1.15
   libssl3                         3.0.2-0ubuntu1.15
   openssl                         3.0.2-0ubuntu1.15

Ubuntu 20.04 LTS:
   libssl-doc                      1.1.1f-1ubuntu2.22
   libssl1.1                       1.1.1f-1ubuntu2.22
   openssl                         1.1.1f-1ubuntu2.22

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   libssl-doc                      1.1.1-1ubuntu2.1~18.04.23+esm5
   libssl1.1                       1.1.1-1ubuntu2.1~18.04.23+esm5
   openssl                         1.1.1-1ubuntu2.1~18.04.23+esm5

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

References:
   https://ubuntu.com/security/notices/USN-6663-1
   https://launchpad.net/bugs/2054090

Package Information:
   https://launchpad.net/ubuntu/+source/openssl/3.0.10-1ubuntu2.3
   https://launchpad.net/ubuntu/+source/openssl/3.0.2-0ubuntu1.15
   https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.22