Debian DSA-1948-1 : ntp - denial of service

Medium Nessus Plugin ID 44813


The remote Debian host is missing a security-related update.


Robin Park and Dmitri Vinokurov discovered that the daemon component of the ntp package, a reference implementation of the NTP protocol, is not properly reacting to certain incoming packets.

An unexpected NTP mode 7 packet (MODE_PRIVATE) with spoofed IP data can lead ntpd to reply with a mode 7 response to the spoofed address.
This may result in the service playing packet ping-pong with other ntp servers or even itself which causes CPU usage and excessive disk use due to logging. An attacker can use this to conduct denial of service attacks.


Upgrade the ntp packages.

For the oldstable distribution (etch), this problem has been fixed in version 1:4.2.2.p4+dfsg-2etch4.

For the stable distribution (lenny), this problem has been fixed in version 1:4.2.4p4+dfsg-8lenny3.

See Also

Plugin Details

Severity: Medium

ID: 44813

File Name: debian_DSA-1948.nasl

Version: 1.12

Type: local

Agent: unix

Published: 2010/02/24

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:debian:debian_linux:ntp, cpe:/o:debian:debian_linux:4.0, cpe:/o:debian:debian_linux:5.0

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2009/12/08

Reference Information

CVE: CVE-2009-3563

DSA: 1948