========================================================================== Ubuntu Security Notice USN-4738-1 February 18, 2021 openssl, openssl1.0 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in OpenSSL. Software Description: - openssl: Secure Socket Layer (SSL) cryptographic library and tools - openssl1.0: Secure Socket Layer (SSL) cryptographic library and tools Details: Paul Kehrer discovered that OpenSSL incorrectly handled certain input lengths in EVP functions. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23840) Tavis Ormandy discovered that OpenSSL incorrectly handled parsing issuer fields. A remote attacker could possibly use this issue to cause OpenSSL to crash, resulting in a denial of service. (CVE-2021-23841) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: libssl1.1 1.1.1f-1ubuntu4.2 Ubuntu 20.04 LTS: libssl1.1 1.1.1f-1ubuntu2.2 Ubuntu 18.04 LTS: libssl1.0.0 1.0.2n-1ubuntu5.6 libssl1.1 1.1.1-1ubuntu2.1~18.04.8 Ubuntu 16.04 LTS: libssl1.0.0 1.0.2g-1ubuntu4.19 After a standard system update you need to reboot your computer to make all the necessary changes. References: https://usn.ubuntu.com/4738-1 CVE-2021-23840, CVE-2021-23841 Package Information: https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu4.2 https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.2 https://launchpad.net/ubuntu/+source/openssl/1.1.1-1ubuntu2.1~18.04.8 https://launchpad.net/ubuntu/+source/openssl1.0/1.0.2n-1ubuntu5.6 https://launchpad.net/ubuntu/+source/openssl/1.0.2g-1ubuntu4.19