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Ubuntu Security Notice USN-6663-3
May 23, 2024

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

- Ubuntu 24.04 LTS

Summary:

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

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

Details:

USN-6663-1 provided a security update for OpenSSL.
This update provides the corresponding update for
Ubuntu 24.04 LTS.

Original advisory details:

  As a security improvement, OpenSSL will now
  return deterministic random bytes instead of 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 24.04 LTS
   libssl-doc                      3.0.13-0ubuntu3.1
   libssl3t64                      3.0.13-0ubuntu3.1
   openssl                         3.0.13-0ubuntu3.1

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

References:
   https://ubuntu.com/security/notices/USN-6663-3
   https://ubuntu.com/security/notices/USN-6663-1
   https://launchpad.net/bugs/2054090

Package Information:
   https://launchpad.net/ubuntu/+source/openssl/3.0.13-0ubuntu3.1