Debian DLA-559-1 : ntp security update

high Nessus Plugin ID 92546

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Synopsis

The remote Debian host is missing a security update.

Description

Several vulnerabilities were discovered in the Network Time Protocol daemon and utility programs :

CVE-2015-7974

Matt Street discovered that insufficient key validation allows impersonation attacks between authenticated peers.

CVE-2015-7977 / CVE-2015-7978

Stephen Gray discovered that a NULL pointer dereference and a buffer overflow in the handling of 'ntpdc reslist' commands may result in denial of service.

CVE-2015-7979

Aanchal Malhotra discovered that if NTP is configured for broadcast mode, an attacker can send malformed authentication packets which break associations with the server for other broadcast clients.

CVE-2015-8138

Matthew van Gundy and Jonathan Gardner discovered that missing validation of origin timestamps in ntpd clients may result in denial of service.

CVE-2015-8158

Jonathan Gardner discovered that missing input sanitising in ntpq may result in denial of service.

CVE-2016-1547

Stephen Gray and Matthew van Gundy discovered that incorrect handling of crypto NAK packets my result in denial of service.

CVE-2016-1548

Jonathan Gardner and Miroslav Lichvar discovered that ntpd clients could be forced to change from basic client/server mode to interleaved symmetric mode, preventing time synchronisation.

CVE-2016-1550

Matthew van Gundy, Stephen Gray and Loganaden Velvindron discovered that timing leaks in the the packet authentication code could result in recovery of a message digest.

CVE-2016-2516

Yihan Lian discovered that duplicate IPs on 'unconfig' directives will trigger an assert.

CVE-2016-2518

Yihan Lian discovered that an OOB memory access could potentially crash ntpd.

For Debian 7 'Wheezy', these problems have been fixed in version 1:4.2.6.p5+dfsg-2+deb7u7.

We recommend that you upgrade your ntp packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Upgrade the affected ntp, ntp-doc, and ntpdate packages.

Plugin Details

Severity: High

ID: 92546

File Name: debian_DLA-559.nasl

Version: 2.14

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 7/26/2016

Updated: 1/30/2026

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

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 5

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

CVSS Score Source: CVE-2016-1548

CVSS v3

Risk Factor: High

Base Score: 7.7

Temporal Score: 6.9

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

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

CVSS Score Source: CVE-2015-7974

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 7/25/2016

Reference Information

CVE: CVE-2015-7974, CVE-2015-7977, CVE-2015-7978, CVE-2015-7979, CVE-2015-8138, CVE-2015-8158, CVE-2016-1547, CVE-2016-1548, CVE-2016-1550, CVE-2016-2516, CVE-2016-2518

Detections

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