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Gentoo Linux Security Advisory GLSA 201001-01 |
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http://security.gentoo.org/ |
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Severity: Normal |
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Title: NTP: Denial of Service |
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Date: January 03, 2010 |
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Bugs: #290881 |
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ID: 201001-01 |
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Synopsis |
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======== |
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|
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A Denial of Service condition in ntpd can cause excessive CPU or |
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bandwidth consumption. |
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Background |
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========== |
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NTP is a set of the Network Time Protocol programs. |
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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-misc/ntp < 4.2.4_p7-r1 >= 4.2.4_p7-r1 |
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Description |
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=========== |
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|
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Robin Park and Dmitri Vinokurov discovered that ntp_request.c in ntpd |
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does not handle MODE_PRIVATE packets correctly, causing a continuous |
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exchange of MODE_PRIVATE error responses between two NTP daemons or |
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causing high CPU load on a single host. |
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Impact |
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====== |
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|
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A remote, unauthenticated attacker could send a specially crafted |
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MODE_PRIVATE packet, allowing for a Denial of Service condition (CPU |
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and bandwidth consumption). |
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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 NTP users should upgrade to the latest version: |
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# emerge --sync |
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# emerge --ask --oneshot --verbose ">=net-misc/ntp-4.2.4_p7-r1" |
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References |
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========== |
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[ 1 ] CVE-2009-3563 |
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http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563 |
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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-201001-01.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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https://bugs.gentoo.org. |
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License |
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======= |
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Copyright 2010 Gentoo Foundation, Inc; referenced text |
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belongs to its owner(s). |
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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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