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Gentoo Linux Security Advisory GLSA 200702-06 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: BIND: Denial of Service |
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Date: February 17, 2007 |
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Bugs: #163692 |
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ID: 200702-06 |
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Synopsis |
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======== |
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|
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ISC BIND contains two vulnerabilities allowing a Denial of Service |
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under certain conditions. |
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Background |
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========== |
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|
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ISC BIND is the Internet Systems Consortium implementation of the |
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Domain Name System (DNS) protocol. |
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|
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Affected packages |
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================= |
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|
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------------------------------------------------------------------- |
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Package / Vulnerable / Unaffected |
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------------------------------------------------------------------- |
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1 net-dns/bind < 9.3.4 >= 9.3.4 |
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*>= 9.2.8 |
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|
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Description |
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=========== |
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|
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An unspecified improper usage of an already freed context has been |
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reported. Additionally, an assertion error could be triggered in the |
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DNSSEC validation of some responses to type ANY queries with multiple |
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RRsets. |
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|
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Impact |
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====== |
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|
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A remote attacker could crash the server through unspecified vectors |
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or, if DNSSEC validation is enabled, by sending certain crafted ANY |
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queries. |
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|
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Workaround |
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========== |
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|
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There is no known workaround at this time for the first issue. The |
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DNSSEC validation Denial of Service can be prevented by disabling |
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DNSSEC validation until the upgrade to a fixed version. Note that |
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DNSSEC validation is disabled on a default configuration. |
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|
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Resolution |
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========== |
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All ISC BIND 9.3 users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-dns/bind-9.3.4" |
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All ISC BIND 9.2 users should upgrade to the latest version: |
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|
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-dns/bind-9.2.8" |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2007-0493 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-0493 |
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[ 2 ] CVE-2007-0494 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-CVE-2007-0494 |
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|
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Availability |
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============ |
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|
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This GLSA and any updates to it are available for viewing at |
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the Gentoo Security Website: |
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|
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http://security.gentoo.org/glsa/glsa-200702-06.xml |
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|
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Concerns? |
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========= |
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Security is a primary focus of Gentoo Linux and ensuring the |
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confidentiality and security of our users machines is of utmost |
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importance to us. Any security concerns should be addressed to |
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security@g.o or alternatively, you may file a bug at |
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http://bugs.gentoo.org. |
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|
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License |
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======= |
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Copyright 2007 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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|
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The contents of this document are licensed under the |
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Creative Commons - Attribution / Share Alike license. |
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|
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http://creativecommons.org/licenses/by-sa/2.5 |
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