========================================================================== Ubuntu Security Notice USN-4692-1 January 13, 2021 tar 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 - Ubuntu 14.04 ESM - Ubuntu 12.04 ESM Summary: Several security issues were fixed in tar. Software Description: - tar: GNU version of the tar archiving utility Details: Chris Siebenmann discovered that tar incorrectly handled extracting files resized during extraction when invoked with the --sparse flag. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 12.04 ESM, Ubuntu 14.04 ESM, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2018-20482) Daniel Axtens discovered that tar incorrectly handled certain malformed tar files. If a user or automated system were tricked into processing a specially crafted tar archive, a remote attacker could use this issue to cause tar to crash, resulting in a denial of service. (CVE-2019-9923) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: tar 1.30+dfsg-7ubuntu0.20.10.1 Ubuntu 20.04 LTS: tar 1.30+dfsg-7ubuntu0.20.04.1 Ubuntu 18.04 LTS: tar 1.29b-2ubuntu0.2 Ubuntu 16.04 LTS: tar 1.28-2.1ubuntu0.2 Ubuntu 14.04 ESM: tar 1.27.1-1ubuntu0.1+esm1 Ubuntu 12.04 ESM: tar 1.26-4ubuntu1.2 In general, a standard system update will make all the necessary changes. References: https://usn.ubuntu.com/4692-1 CVE-2018-20482, CVE-2019-9923 Package Information: https://launchpad.net/ubuntu/+source/tar/1.30+dfsg-7ubuntu0.20.10.1 https://launchpad.net/ubuntu/+source/tar/1.30+dfsg-7ubuntu0.20.04.1 https://launchpad.net/ubuntu/+source/tar/1.29b-2ubuntu0.2 https://launchpad.net/ubuntu/+source/tar/1.28-2.1ubuntu0.2