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Gentoo: 201606-13 Moderate: Sudo Symlink Attack Risk and Resolution

sudo is vulnerable to an escalation of privileges via a symlink attack.. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 201606-13 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: sudo: Unauthorized privilege escalation in sudoedit Date: June 26, 2016 Bugs: #564774 ID: 201606-13 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= sudo is vulnerable to an escalation of privileges via a symlink attack. Background ========= sudo (su "do") allows a system administrator to delegate authority to give certain users (or groups of users) the ability to run some (or all) commands as root or another user while providing an audit trail of the commands and their arguments. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-admin/sudo < 1.8.15-r1 > = 1.8.15-r1 Description ========== sudoedit in sudo is vulnerable to the escalation of privileges by local users via a symlink attack. This can be exploited by a file whose full path is defined using multiple wildcards in /etc/sudoers, as demonstrated by "/home/*/*/file.txt. Impact ===== Local users are able to gain unauthorized privileges on the system. Workaround ========= There is no known work around at this time. Resolution ========= All sudo users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose "> =app-admin/sudo-1.8.15-r1" References ========= [ 1 ] CVE-2015-5602 http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-5602 Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/201606-13 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 This email address is being protected from spambots. You need JavaScript enabled to view it. or alternatively, you may file a bug at https://bugs.gentoo.org. License ====== Copyright 2016 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/ . Debian security release DSA 2023-30 highlights critical OpenSSH vulnerability allowing potential user compromise. Immediate action advised!. Gentoo, Symlink Attack, Privilege Escalation, Security Advisory, Sudo Update. . LinuxSecurity.com Team

Jun 26, 2016 Gentoo