========================================================================== Ubuntu Security Notice USN-4968-1 May 26, 2021 lz4 vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: LZ4 could be made to crash or run programs if it opened a specially crafted file. Software Description: - lz4: Extremely fast compression algorithm Details: It was discovered that LZ4 incorrectly handled certain memory operations. If a user or automated system were tricked into uncompressing a specially- crafted LZ4 file, a remote attacker could use this issue to cause LZ4 to crash, resulting in a denial of service, or possibly execute arbitrary code. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: liblz4-1 1.9.3-1ubuntu0.1 Ubuntu 20.10: liblz4-1 1.9.2-2ubuntu0.20.10.1 Ubuntu 20.04 LTS: liblz4-1 1.9.2-2ubuntu0.20.04.1 Ubuntu 18.04 LTS: liblz4-1 0.0~r131-2ubuntu3.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-4968-1 CVE-2021-3520 Package Information: https://launchpad.net/ubuntu/+source/lz4/1.9.3-1ubuntu0.1 https://launchpad.net/ubuntu/+source/lz4/1.9.2-2ubuntu0.20.10.1 https://launchpad.net/ubuntu/+source/lz4/1.9.2-2ubuntu0.20.04.1 https://launchpad.net/ubuntu/+source/lz4/0.0~r131-2ubuntu3.1