- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 202011-17 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Low Title: MIT Kerberos 5: Denial of service Date: November 16, 2020 Bugs: #753281 ID: 202011-17 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== A vulnerability in MIT Kerberos 5 could lead to a Denial of Service condition. Background ========== The MIT Kerberos 5 implementation provides a command line telnet client which is used for remote login via the telnet protocol. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-crypt/mit-krb5 < 1.18.2-r2 >= 1.18.2-r2 Description =========== It was discovered that MIT Kerberos network authentication system, krb5, did not properly handle ASN.1-encoded Kerberos messages. Impact ====== A remote attacker could send a specially crafted Kerberos message, possibly resulting in a Denial of Service condition. Workaround ========== There is no known workaround at this time. Resolution ========== All MIT Kerberos 5 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.18.2-r2" References ========== [ 1 ] CVE-2020-28196 https://nvd.nist.gov/vuln/detail/CVE-2020-28196 Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/202011-17 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 2020 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