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Gentoo Linux Security Advisory GLSA 200807-08 |
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http://security.gentoo.org/ |
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Severity: High |
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Title: BIND: Cache poisoning |
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Date: July 11, 2008 |
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Bugs: #231201 |
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ID: 200807-08 |
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Synopsis |
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======== |
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|
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A weakness in the DNS protocol has been reported, which could lead to |
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cache poisoning on recursive resolvers. |
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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 < 9.4.2_p1 >= 9.4.2_p1 |
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Description |
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=========== |
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|
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Dan Kaminsky of IOActive has reported a weakness in the DNS protocol |
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related to insufficient randomness of DNS transaction IDs and query |
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source ports. |
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Impact |
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====== |
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|
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An attacker could exploit this weakness to poison the cache of a |
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recursive resolver and thus spoof DNS traffic, which could e.g. lead to |
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the redirection of web or mail traffic to malicious sites. |
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Workaround |
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========== |
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There is no known workaround at this time. |
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Resolution |
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========== |
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All BIND users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-dns/bind-9.4.2_p1" |
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Note: In order to utilize the query port randomization to mitigate the |
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weakness, you need to make sure that your network setup allows the DNS |
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server to use random source ports for query and that you have not set a |
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fixed query port via the "query-source port" directive in the BIND |
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configuration. |
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|
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References |
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========== |
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|
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[ 1 ] CVE-2008-1447 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1447 |
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|
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Availability |
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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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http://security.gentoo.org/glsa/glsa-200807-08.xml |
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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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License |
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======= |
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Copyright 2008 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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http://creativecommons.org/licenses/by-sa/2.5 |
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