Security Bulletin: Vulnerabilities in NTP affect IBM Flex System FC3171 8Gb SAN Switch and SAN Pass-thru, QLogic 8Gb Intelligent Pass-thru Module & SAN Switch Module for BladeCenter and QLogic Virtual Fabric Extension Module for IBM BladeCenter

Summary

IBM Flex System FC43171 8Gb SAN Switch and SAN Pass-thru, QLogic 8Gb Intelligent Pass-thru Module and SAN Switch Module for BladeCenter and QLogic Virtual Fabric Extension Module for IBM BladeCenter have addressed the following vulnerabilities in NTP.

Vulnerability Details

Summary

IBM Flex System FC3171 8Gb SAN Switch and SAN Pass-thru, QLogic 8Gb Intelligent Pass-thru Module & SAN Switch Module for BladeCenter and QLogic Virtual Fabric Extension Module for IBM BladeCenter have addressed the following vulnerabilities in NTP.

Vulnerability Details:

CVEID: CVE-2016-1547

Description: NTP is vulnerable to a denial of service, caused by the demobilization of a preemptable client association. By sending specially crafted crypto NAK packets, an attacker could exploit this vulnerability to cause a denial of service.

CVSS Base Score: 3.7
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112739&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)

CVEID: CVE-2016-1548

Description: NTP could allow a remote attacker to bypass security restrictions, caused by an error in the ntpd client. By changing the client from basic client/server mode to interleaved symmetric mode, an attacker could exploit this vulnerability to modify the time of the client or cause a denial of service.

CVSS Base Score: 7.2
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112740&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L)

CVEID: CVE-2016-1549

Description: NTP could allow a remote authenticated attacker to bypass security restrictions, caused by the failure to prevent Sybil attacks from authenticated peers. By creating multiple ephemeral associations to win the clock selection of ntpd, an attacker could exploit this vulnerability to modify a victim’s clock.

CVSS Base Score: 5.3
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112741&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N)

CVEID: CVE-2016-1551

Description: NTP could allow a remote authenticated attacker to bypass security restrictions, caused by the failure to filter IPv4 bogon packets received from the network. If ntpd is configured to use a reference clock, an attacker could exploit this vulnerability to spoof refclock packets to ntpd processes.

CVSS Base Score: 3.7
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112743&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N)

CVEID: CVE-2016-2516

Description: NTP is vulnerable to a denial of service, caused by the improper validation of input. By creating a session with duplicate IPs on unconfig directives, an attacker could exploit this vulnerability to cause an assertion failure.

CVSS Base Score: 4.2
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112744&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H)

CVEID: CVE-2016-2517

Description: NTP is vulnerable to a denial of service, caused by the improper validation of remote configuration trustedkey/requestkey/controlkey values. By creating a session with duplicate IPs on unconfig directives, an attacker could exploit this vulnerability to cause an assertion botch in ntpd.

CVSS Base Score: 4.2
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112745&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H)

CVEID: CVE-2016-2518

Description: NTP is vulnerable to a denial of service, caused by an error when using a specially crafted packet to create a peer association with hmode > 7. An attacker could exploit this vulnerability to cause the MATCH_ASSOC() function to trigger an out-of-bounds read.

CVSS Base Score: 2
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112746&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L)

CVEID: CVE-2016-2519

Description: NTP is vulnerable to a denial of service, caused by the failure to always check the ctl_getitem() function return value. By sending an overly large value, an attacker could exploit this vulnerability to cause a denial of service.

CVSS Base Score: 4.2
CVSS Temporal Score: See <https://exchange.xforce.ibmcloud.com/vulnerabilities/112747&gt; for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H)

Affected Products and Versions

Remediation/Fixes:

Firmware fix versions are available on Fix Central:
<http://www.ibm.com/support/fixcentral/&gt;.

You should verify applying the fix does not cause any compatibility issues.

Workaround(s) & Mitigation(s):

None

References:

• Complete CVSS v3 Guide
• On-line Calculator v3

Related Information:
IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog
Lenovo Product Security Advisories

Acknowledgement

None

Change History
17 January 2017: Original Copy Published
09 February 2017: Revised CVE-ID to CVEID and changed http to https in Vulnerability Details section.

• The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.

Disclaimer

According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an “industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response.” IBM PROVIDES THE CVSS SCORES “AS IS” WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.