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

medium Nessus Plugin ID 44813

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Synopsis

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

Description

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.

Solution

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

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=560074

https://www.debian.org/security/2009/dsa-1948

Plugin Details

Severity: Medium

ID: 44813

File Name: debian_DSA-1948.nasl

Version: 1.13

Type: local

Agent: unix

Published: 2/24/2010

Updated: 1/4/2021

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

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 Ease: No known exploits are available

Patch Publication Date: 12/8/2009

Reference Information

CVE: CVE-2009-3563

DSA: 1948