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Gentoo alert 200507-11 (mit-krb5)

From:  Sune Kloppenborg Jeppesen <jaervosz@gentoo.org>
To:  gentoo-announce@lists.gentoo.org
Subject:  [gentoo-announce] [ GLSA 200507-11 ] MIT Kerberos 5: Multiple vulnerabilities
Date:  Tue, 12 Jul 2005 21:08:32 +0200
Cc:  bugtraq@securityfocus.com, full-disclosure@lists.grok.org.uk, security-alerts@linuxsecurity.com

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200507-11 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - http://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: High Title: MIT Kerberos 5: Multiple vulnerabilities Date: July 12, 2005 Bugs: #98799 ID: 200507-11 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======== MIT Kerberos 5 is vulnerable to a Denial of Service attack and remote execution of arbitrary code, possibly leading to the compromise of the entire Kerberos realm. Background ========== MIT Kerberos 5 is the free implementation of the Kerberos network authentication protocol by the Massachusetts Institute of Technology. Affected packages ================= ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 app-crypt/mit-krb5 < 1.4.1-r1 >= 1.4.1-r1 Description =========== Daniel Wachdorf discovered that MIT Kerberos 5 could corrupt the heap by freeing unallocated memory when receiving a special TCP request (CAN-2005-1174). He also discovered that the same request could lead to a single-byte heap overflow (CAN-2005-1175). Magnus Hagander discovered that krb5_recvauth() function of MIT Kerberos 5 might try to double-free memory (CAN-2005-1689). Impact ====== Although exploitation is considered difficult, a remote attacker could exploit the single-byte heap overflow and the double-free vulnerability to execute arbitrary code, which could lead to the compromise of the whole Kerberos realm. A remote attacker could also use the heap corruption to cause a Denial of Service. Workaround ========== There are no known workarounds at this time. Resolution ========== All MIT Kerberos 5 users should upgrade to the latest available version: # emerge --sync # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.4.1-r1" References ========== [ 1 ] CAN-2005-1174 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1174 [ 2 ] CAN-2005-1175 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1175 [ 3 ] CAN-2005-1689 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1689 [ 4 ] MITKRB5-SA-2005-002 http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-00... [ 5 ] MITKRB5-SA-2005-003 http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2005-00... Availability ============ This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200507-11.xml 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 http://bugs.gentoo.org. License ======= Copyright 2005 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. http://creativecommons.org/licenses/by-sa/2.0


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