Debian DSA-3223-1 : ntp - security update

high Nessus Plugin ID 82745

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Synopsis

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

Description

Multiple vulnerabilities were discovered in ntp, an implementation of the Network Time Protocol :

- CVE-2015-1798 When configured to use a symmetric key with an NTP peer, ntpd would accept packets without MAC as if they had a valid MAC. This could allow a remote attacker to bypass the packet authentication and send malicious packets without having to know the symmetric key.

- CVE-2015-1799 When peering with other NTP hosts using authenticated symmetric association, ntpd would update its internal state variables before the MAC of the NTP messages was validated. This could allow a remote attacker to cause a denial of service by impeding synchronization between NTP peers.

Additionally, it was discovered that generating MD5 keys using ntp-keygen on big endian machines would either trigger an endless loop, or generate non-random keys.

Solution

Upgrade the ntp packages.

For the stable distribution (wheezy), these problems have been fixed in version 1:4.2.6.p5+dfsg-2+deb7u4.

For the stable distribution (jessie), these problems have been fixed in version 1:4.2.6.p5+dfsg-7.

Plugin Details

Severity: High

ID: 82745

File Name: debian_DSA-3223.nasl

Version: 1.11

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 4/14/2015

Updated: 1/11/2021

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

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:debian:debian_linux:ntp, cpe:/o:debian:debian_linux:7.0, cpe:/o:debian:debian_linux:8.0

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

Exploit Ease: No known exploits are available

Patch Publication Date: 4/12/2015

Reference Information

CVE: CVE-2015-1798, CVE-2015-1799, CVE-2015-3405

DSA: 3223

Detections

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