GLSA-201001-01 : NTP: Denial of Service

Medium Nessus Plugin ID 44890


The remote Gentoo host is missing one or more security-related patches.


The remote host is affected by the vulnerability described in GLSA-201001-01 (NTP: Denial of Service)

Robin Park and Dmitri Vinokurov discovered that ntp_request.c in ntpd does not handle MODE_PRIVATE packets correctly, causing a continuous exchange of MODE_PRIVATE error responses between two NTP daemons or causing high CPU load on a single host.
Impact :

A remote, unauthenticated attacker could send a specially crafted MODE_PRIVATE packet, allowing for a Denial of Service condition (CPU and bandwidth consumption).
Workaround :

There is no known workaround at this time.


All NTP users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=net-misc/ntp-4.2.4_p7-r1'

See Also

Plugin Details

Severity: Medium

ID: 44890

File Name: gentoo_GLSA-201001-01.nasl

Version: 1.13

Type: local

Published: 2010/02/25

Updated: 2019/08/02

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 6.4

Temporal Score: 4.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:ntp, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2010/01/03

Reference Information

CVE: CVE-2009-3563

BID: 37255

GLSA: 201001-01