==========================================================================
Ubuntu Security Notice USN-6663-2
March 13, 2024
openssl update
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 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:
USN-6663-1 provided a security update for OpenSSL.
This update provides the corresponding update for
Ubuntu 16.04 LTS.
Original advisory 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 16.04 LTS (Available with Ubuntu Pro):
   libssl-doc                      1.0.2g-1ubuntu4.20+esm12
   libssl1.0.0                     1.0.2g-1ubuntu4.20+esm12
   openssl                         1.0.2g-1ubuntu4.20+esm12
After a standard system update you need to reboot your computer to make
all the necessary changes.
References:
   https://ubuntu.com/security/notices/USN-6663-2
   https://ubuntu.com/security/notices/USN-6663-1
   https://launchpad.net/bugs/2054090