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AIX NTP v3 Advisory : ntp_advisory4.asc (IV79942) (IV79943) (IV79944) (IV79945) (IV79946)

critical Nessus Plugin ID 102321

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Synopsis

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

Description

The remote AIX host has a version of Network Time Protocol (NTP) installed that is affected by the following vulnerabilities :

 - A divide-by-zero error exists in file include/ntp.h when handling LOGTOD and ULOGTOD macros in a crafted NTP packet. An unauthenticated, remote attacker can exploit this, via crafted NTP packets, to crash ntpd.
 (CVE 2015-5219)

 - A flaw exists in the ntp_crypto.c file due to improper validation of the 'vallen' value in extension fields. An unauthenticated, remote attacker can exploit this, via specially crafted autokey packets, to disclose sensitive information or cause a denial of service.
 (CVE-2015-7691)

 - A denial of service vulnerability exists in the autokey functionality due to a failure in the crypto_bob2(), crypto_bob3(), and cert_sign() functions to properly validate the 'vallen' value. An unauthenticated, remote attacker can exploit this, via specially crafted autokey packets, to crash the NTP service. (CVE-2015-7692)

 - A denial of service vulnerability exists in the crypto_recv() function in the file ntp_crypto.c related to autokey functionality. An unauthenticated, remote attacker can exploit this, via an ongoing flood of NTPv4 autokey requests, to exhaust memory resources.
 (CVE-2015-7701)

 - A denial of service vulnerability exists due to improper validation of packets containing certain autokey operations. An unauthenticated, remote attacker can exploit this, via specially crafted autokey packets, to crash the NTP service. (CVE-2015-7702)

 - A denial of service vulnerability exists due to a logic flaw in the authreadkeys() function in the file authreadkeys.c when handling extended logging where the log and key files are set to be the same file. An authenticated, remote attacker can exploit this, via a crafted set of remote configuration requests, to cause the NTP service to stop responding. (CVE-2015-7850)

 - A overflow condition exists in the read_refclock_packet() function in the file ntp_io.c when handling negative data lengths. A local attacker can exploit this to crash the NTP service or possibly gain elevated privileges. (CVE-2015-7853)

 - A denial of service vulnerability exists due to an assertion flaw in the decodenetnum() function in the file decodenetnum.c when handling long data values in mode 6 and 7 packets. An unauthenticated, remote attacker can exploit this to crash the NTP service.
 (CVE-2015-7855)

Solution

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

See Also

https://aix.software.ibm.com/aix/efixes/security/ntp_advisory4.asc

Plugin Details

Severity: Critical

ID: 102321

File Name: aix_ntp_v3_advisory4.nasl

Version: 2.7

Type: local

Published: 8/9/2017

Updated: 12/2/2025

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.9

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

CVSS Score Source: CVE-2015-7853

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.8

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

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

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/21/2016

Vulnerability Publication Date: 4/12/2013

Reference Information

CVE: CVE-2015-5219, CVE-2015-7691, CVE-2015-7692, CVE-2015-7701, CVE-2015-7702, CVE-2015-7850, CVE-2015-7853, CVE-2015-7855

BID: 76473, 77273, 77274, 77279, 77281, 77283, 77285, 77286