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Gentoo: 200702-06 Standard: ISC BIND Denial Of Service Vulnerability

ISC BIND contains two vulnerabilities allowing a Denial of Service under certain conditions.. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Gentoo Linux Security Advisory GLSA 200702-06 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - https://security.gentoo.org/ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Severity: Normal Title: BIND: Denial of Service Date: February 17, 2007 Bugs: #163692 ID: 200702-06 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Synopsis ======= ISC BIND contains two vulnerabilities allowing a Denial of Service under certain conditions. Background ========= ISC BIND is the Internet Systems Consortium implementation of the Domain Name System (DNS) protocol. Affected packages ================ ------------------------------------------------------------------- Package / Vulnerable / Unaffected ------------------------------------------------------------------- 1 net-dns/bind < 9.3.4 > = 9.3.4 *> = 9.2.8 Description ========== An unspecified improper usage of an already freed context has been reported. Additionally, an assertion error could be triggered in the DNSSEC validation of some responses to type ANY queries with multiple RRsets. Impact ===== A remote attacker could crash the server through unspecified vectorsor, if DNSSEC validation is enabled, by sending certain crafted ANY queries. Workaround ========= There is no known workaround at this time for the first issue. The DNSSEC validation Denial of Service can be prevented by disabling DNSSEC validation until the upgrade to a fixed version. Note that DNSSEC validation is disabled on a default configuration. Resolution ========= All ISC BIND 9.3 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose "> =net-dns/bind-9.3.4" All ISC BIND 9.2 users should upgrade to the latest version: # emerge --sync # emerge --ask --oneshot --verbose "> =net-dns/bind-9.2.8" References ========= [ 1 ] CVE-2007-0493 https://www.cve.org/CVERecord?id=CVE-2007-0493 [ 2 ] CVE-2007-0494 https://www.cve.org/CVERecord?id=CVE-CVE-2007-0494 Availability =========== This GLSA and any updates to it are available for viewing at the Gentoo Security Website: https://security.gentoo.org/glsa/200702-06 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 2007 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/ . Recent ISC BIND flaws in Gentoo lead to potential denial-of-service scenarios impacting overall system performance. Immediate upgrade advised.. DenialOfService, ISCBIND, GentooLinux, SecurityAdvisory, UpgradeRequired. . LinuxSecurity.com Team

Feb 17, 2007 Gentoo