--- title: 'USN-4764-1: GLib 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-4764-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-4764-1 --- # USN-4764-1: GLib vulnerability Publication date 15 March 2021 Overview GLib could be made to create files if it opened a specially crafted archive. Releases [20.10](https://ubuntu.com/security/notices?release=groovy) [20.04 LTS](https://ubuntu.com/security/notices?release=focal) [18.04 LTS](https://ubuntu.com/security/notices?release=bionic) [16.04 LTS](https://ubuntu.com/security/notices?release=xenial) --- Open side navigation ## Packages * [glib2.0](https://ubuntu.com/security/cves?package=glib2.0) - GLib library of C routines ## Details It was discovered that GLib incorrectly handled certain symlinks when replacing files. If a user or automated system were tricked into extracting a specially crafted file with File Roller, a remote attacker could possibly create files outside of the intended directory. ## 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 | | --- | --- | | 20.10 groovy | [libglib2.0-0](https://launchpad.net/ubuntu/+source/glib2.0) –  [2.66.1-2ubuntu0.2](https://launchpad.net/ubuntu/+source/glib2.0/2.66.1-2ubuntu0.2) | | | | 20.04 LTS focal | [libglib2.0-0](https://launchpad.net/ubuntu/+source/glib2.0) –  [2.64.6-1~ubuntu20.04.3](https://launchpad.net/ubuntu/+source/glib2.0/2.64.6-1~ubuntu20.04.3) | | | | 18.04 LTS bionic | [libglib2.0-0](https://launchpad.net/ubuntu/+source/glib2.0) –  [2.56.4-0ubuntu0.18.04.8](https://launchpad.net/ubuntu/+source/glib2.0/2.56.4-0ubuntu0.18.04.8) | | | | 16.04 LTS xenial | [libglib2.0-0](https://launchpad.net/ubuntu/+source/glib2.0) –  [2.48.2-0ubuntu4.8](https://launchpad.net/ubuntu/+source/glib2.0/2.48.2-0ubuntu4.8) | | | --- ### 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-2021-28153](https://ubuntu.com/security/CVE-2021-28153)