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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