========================================================================== Ubuntu Security Notice USN-4397-1 June 16, 2020
nss vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 19.10 - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in NSS. Software Description: - nss: Network Security Service library Details: It was discovered that NSS incorrectly handled the TLS State Machine. A remote attacker could possibly use this issue to cause NSS to hang, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS and Ubuntu 19.10. (CVE-2019-17023) Cesar Pereida Garcia discovered that NSS incorrectly handled DSA key generation. A local attacker could possibly use this issue to perform a timing attack and recover DSA keys. (CVE-2020-12399) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: libnss3 2:3.49.1-1ubuntu1.1 Ubuntu 19.10: libnss3 2:3.45-1ubuntu2.3 Ubuntu 18.04 LTS: libnss3 2:3.35-2ubuntu2.8 Ubuntu 16.04 LTS: libnss3 2:3.28.4-0ubuntu0.16.04.11 After a standard system update you need to reboot your computer to make all the necessary changes. References: https://usn.ubuntu.com/4397-1 CVE-2019-17023, CVE-2020-12399 Package Information: https://launchpad.net/ubuntu/+source/nss/2:3.49.1-1ubuntu1.1 https://launchpad.net/ubuntu/+source/nss/2:3.45-1ubuntu2.3 https://launchpad.net/ubuntu/+source/nss/2:3.35-2ubuntu2.8 https://launchpad.net/ubuntu/+source/nss/2:3.28.4-0ubuntu0.16.04.11
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