--- title: 'USN-4066-1: libmspack vulnerability | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-4066-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-4066-1 --- # USN-4066-1: libmspack vulnerability Publication date 18 July 2019 Overview libmspack could be made to expose sensitive information if it received a specially crafted CHM file. Releases [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) [16.04 LTS](https://ubuntu.com/security/notices?release=xenial) --- Open side navigation ## Packages * [libmspack](https://ubuntu.com/security/cves?package=libmspack) - library for Microsoft compression formats ## Details It was discovered that libmspack incorrectly handled certain CHM files. A remote attacker could possibly use this issue to access sensitive information. ## Update instructions In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 18.04 LTS bionic | [libmspack0](https://launchpad.net/ubuntu/+source/libmspack) –  [0.6-3ubuntu0.3](https://launchpad.net/ubuntu/+source/libmspack/0.6-3ubuntu0.3) | | | | 16.04 LTS xenial | [libmspack0](https://launchpad.net/ubuntu/+source/libmspack) –  [0.5-1ubuntu0.16.04.4](https://launchpad.net/ubuntu/+source/libmspack/0.5-1ubuntu0.16.04.4) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2019-1010305](https://ubuntu.com/security/CVE-2019-1010305) ## Related notices * [USN-7788-1](https://ubuntu.com/security/notices/USN-7788-1) * [USN-4066-2](https://ubuntu.com/security/notices/USN-4066-2)