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Ubuntu 23.10: 6663-1 Moderate: OpenSSL PKCS#1 Timing Attack

Add implicit rejection in PKCS#1 v1.5 in OpenSSL.. ========================================================================== 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 standardsystem update you need to reboot your computer to make all the necessary changes. References: https://ubuntu.com/security/notices/USN-6663-1 https://bugs.launchpad.net/ubuntu/+source/openssl/+bug/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 . Mitigates the risk of timing attacks by ensuring OpenSSL does not reveal padding errors in PKCS#1 v1.5 across several Ubuntu versions.. Openssl Update, Ubuntu Security, PKCS#1 Timing Attack. . LinuxSecurity.com Team

Feb 27, 2024 Ubuntu