- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202405-19 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: xar: Unsafe Extraction Date: May 07, 2024 Bugs: #820641 ID: 202405-19 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== A vulnerability has been discovered in xar, which can lead to privilege escalation. Background ========== xar provides an easily extensible archive format. Affected packages ================= Package Vulnerable Unaffected ------------ ------------------- -------------------- app-arch/xar < 1.8.0.0.487.100.1 >= 1.8.0.0.487.100.1 Description =========== A vulnerability has been discovered in xar. Please review the CVE identifier referenced below for details. Impact ====== xar allows for a forward-slash separated path to be specified in the file name property, e.g. x/foo – as long as it doesn’t traverse upwards, and the path exists within the current directory. This means an attacker can create a .xar file which contains both a directory symlink, and a file with a name property which points into the extracted symlink directory. By abusing symlink directories in this manner, an attacker can write arbitrary files to any directory on the filesystem – providing the user has permissions to write to it. Workaround ========== There is no known workaround at this time. Resolution ========== All xar users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-arch/xar-1.8.0.0.487.100.1" References ========== [ 1 ] CVE-2021-30833 https://nvd.nist.gov/vuln/detail/CVE-2021-30833 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202405-19 Concerns? ========= Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users' machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org. License ======= Copyright 2024 Gentoo Foundation, Inc; referenced text belongs to its owner(s). The contents of this document are licensed under the Creative Commons - Attribution / Share Alike license. https://creativecommons.org/licenses/by-sa/2.5