Scientific Linux Security Update : ntp on 7.x x86_64 (2015:2231)

high Nessus Plugin ID 87564

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Synopsis

The remote Scientific Linux host is missing one or more security updates.

Description

The remote Scientific Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the SLSA-2015:2231-4 advisory.

- The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p2 requires a correct MAC only if the MAC field has a nonzero length, which makes it easier for man-in-the- middle attackers to spoof packets by omitting the MAC. (CVE-2015-1798)

- The symmetric-key feature in the receive function in ntp_proto.c in ntpd in NTP 3.x and 4.x before 4.2.8p2 performs state-variable updates upon receiving certain invalid packets, which makes it easier for man-in- the-middle attackers to cause a denial of service (synchronization loss) by spoofing the source IP address of a peer. (CVE-2015-1799)

- ntp-keygen in ntp 4.2.8px before 4.2.8p2-RC2 and 4.3.x before 4.3.12 does not generate MD5 keys with sufficient entropy on big endian machines when the lowest order byte of the temp variable is between 0x20 and 0x7f and not #, which might allow remote attackers to obtain the value of generated MD5 keys via a brute force attack with the 93 possible keys. (CVE-2015-3405)

- The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X does not properly determine whether a source IP address is an IPv6 loopback address, which makes it easier for remote attackers to spoof restricted packets, and read or write to the runtime state, by leveraging the ability to reach the ntpd machine's network interface with a packet from the ::1 address. (CVE-2014-9751)

- ntp_crypto.c in ntpd in NTP 4.x before 4.2.8p1, when Autokey Authentication is enabled, allows remote attackers to obtain sensitive information from process memory or cause a denial of service (daemon crash) via a packet containing an extension field with an invalid value for the length of its value field.
(CVE-2014-9750)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 87564

File Name: sl_20151119_ntp_on_SL7_x.nasl

Version: 2.7

Type: local

Agent: unix

Family: Scientific Linux Local Security Checks

Published: 12/22/2015

Updated: 8/29/2025

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

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

CVSS Score Source: CVE-2014-9751

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

CVSS Score Source: CVE-2015-3405

Vulnerability Information

CPE: p-cpe:/a:fermilab:scientific_linux:ntp, p-cpe:/a:fermilab:scientific_linux:ntp-doc, p-cpe:/a:fermilab:scientific_linux:sntp, cpe:/o:fermilab:scientific_linux, p-cpe:/a:fermilab:scientific_linux:ntp-debuginfo, p-cpe:/a:fermilab:scientific_linux:ntp-perl, p-cpe:/a:fermilab:scientific_linux:ntpdate

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 11/19/2015

Vulnerability Publication Date: 4/8/2015

Reference Information

CVE: CVE-2014-9750, CVE-2014-9751, CVE-2015-1798, CVE-2015-1799, CVE-2015-3405

Detections

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