AIX NTP v4 Advisory : ntp_advisory7.asc (IV87278) (IV87279)

Medium Nessus Plugin ID 99183

Synopsis

The remote AIX host has a version of NTP installed that is affected by multiple vulnerabilities.

Description

The version of NTP installed on the remote AIX host is affected by the following vulnerabilities :

- A time serving flaw exists in the trusted key system due to improper key checks. An authenticated, remote attacker can exploit this to perform impersonation attacks between authenticated peers. (CVE-2015-7974)

- A denial of service vulnerability exists due to improper handling of a crafted Crypto NAK Packet with a source address spoofed to match that of an existing associated peer. An unauthenticated, remote attacker can exploit this to demobilize a client association. (CVE-2016-1547)

- An information disclosure vulnerability exists in the message authentication functionality in libntp that is triggered during the handling of a series of specially crafted messages. An adjacent attacker can exploit this to partially recover the message digest key.
(CVE-2016-1550)

- A flaw exists due to improper filtering of IPv4 'bogon' packets received from a network. An unauthenticated, remote attacker can exploit this to spoof packets to appear to come from a specific reference clock.
(CVE-2016-1551)

- A denial of service vulnerability exists that allows an authenticated, remote attacker to manipulate the value of the trustedkey, controlkey, or requestkey via a crafted packet, preventing authentication with ntpd until the daemon has been restarted. (CVE-2016-2517)

- An out-of-bounds read error exists in the MATCH_ASSOC() function that occurs during the creation of peer associations with hmode greater than 7. An authenticated, remote attacker can exploit this, via a specially crafted packet, to cause a denial of service.
(CVE-2016-2518)

- An overflow condition exists in the ctl_getitem() function in ntpd due to improper validation of user-supplied input when reporting return values. An authenticated, remote attacker can exploit this to cause ntpd to abort. (CVE-2016-2519)

- A denial of service vulnerability exists when handling authentication due to improper packet timestamp checks.
An unauthenticated, remote attacker can exploit this, via a specially crafted and spoofed packet, to demobilize the ephemeral associations. (CVE-2016-4953)

- A flaw exists that is triggered when handling spoofed packets. An unauthenticated, remote attacker can exploit this, via specially crafted packets, to affect peer variables (e.g., cause leap indications to be set). Note that the attacker must be able to spoof packets with correct origin timestamps from servers before expected response packets arrive. (CVE-2016-4954)

- A flaw exists that is triggered when handling spoofed packets. An unauthenticated, remote attacker can exploit this, via specially crafted packets, to reset autokey associations. Note that the attacker must be able to spoof packets with correct origin timestamps from servers before expected response packets arrive.
(CVE-2016-4955)

- A denial of service vulnerability exists when handling CRYPTO_NAK packets that allows an unauthenticated, remote attacker to cause a crash. (CVE-2016-4957)

Solution

A fix is available and can be downloaded from the IBM AIX website.

See Also

http://aix.software.ibm.com/aix/efixes/security/ntp_advisory7.asc

Plugin Details

Severity: Medium

ID: 99183

File Name: aix_ntp_v4_advisory7.nasl

Version: 1.7

Type: local

Published: 2017/04/04

Modified: 2018/06/29

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5

Temporal Score: 3.7

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSSv3

Base Score: 8.6

Temporal Score: 7.5

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

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

Vulnerability Information

CPE: cpe:/o:ibm:aix, cpe:/a:ntp:ntp

Required KB Items: Host/AIX/lslpp, Host/local_checks_enabled, Host/AIX/version

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2016/09/06

Vulnerability Publication Date: 2015/12/12

Reference Information

CVE: CVE-2015-7974, CVE-2016-1547, CVE-2016-1550, CVE-2016-1551, CVE-2016-2517, CVE-2016-2518, CVE-2016-2519, CVE-2016-4953, CVE-2016-4954, CVE-2016-4955, CVE-2016-4957

BID: 81960, 88189, 88204, 88219, 88226, 88261, 88276, 91007, 91010

CERT: 321640, 718152