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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
(Oracle Issues Fix for Oracle Linux) ntp Multiple Bugs Let Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1037784
SecurityTracker URL:  http://securitytracker.com/id/1037784
CVE Reference:   CVE-2016-7426, CVE-2016-7429, CVE-2016-7433, CVE-2016-9310, CVE-2016-9311   (Links to External Site)
Date:  Feb 7 2017
Impact:   Denial of service via network, Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 4.2.8p9
Description:   Multiple vulnerabilities were reported in ntp. A remote user can cause the target service to crash.

On Windows-based systems with the trap service enabled, a remote user can send a specially crafted packet to trigger a null pointer dereference and cause the ntpd daemon to crash [CVE-2016-9311].

A remote user can send a specially crafted control mode packet to set and unset ntpd traps. As a result, a remote user can obtain potentially sensitive information, conduct denial of service amplification attacks, or cause monitoring to become disabled [CVE-2016-9310].

A remote user with access to the target NTP broadcast domain can inject specially crafted broadcast mode NTP packets into the NTP broadcast domain to exploit a flaw in the replay prevention function cause the target ntpd daemon to reject broadcast mode NTP packets from legitimate NTP broadcast servers [CVE-2016-7427].

A remote user with access to the target NTP broadcast domain can inject specially crafted broadcast mode NTP packets into the NTP broadcast domain to exploit a flaw in the broadcast mode poll interval enforcement function and cause the target ntpd daemon to reject broadcast mode NTP packets from legitimate NTP broadcast servers [CVE-2016-7428].

A remote user can send a specially crafted, large UDP packet to cause the target ntpd daemon to stop functioning [CVE-2016-9312]. Windows based systems are affected.

A regression error exists in the validation of zero origin timestamps [CVE-2016-7431].

On systems with ntpd configured to allow mrulist query requests from the remote user, a remote user can send a specially crafted mrulist query request packet to cause the target ntpd daemon to crash [CVE-2016-7434].

On systems with multiple interfaces on separate networks and where the operating system does not validate source addresses in received packets, a remote user can send a specially crafted packet to trigger an error in selecting the proper interface and temporarily prevent the target ntpd daemon from sending new requests [CVE-2016-7429].

On systems with ntpd configured with rate limiting for all associations, a remote user can send packets with specially crafted source addresses to keep the rate limiting function active and prevent the target ntpd daemon from accepting valid responses [CVE-2016-7426].

An error may occur in the calculation of root sync delay, causing the jitter value to be higher than expected [CVE-2016-7433].

Matthew Van Gundy of Cisco ASIG, Robert Pajak of ABB, Magnus Stubman, Miroslav Lichvar of Red Hat, Brian Utterback of Oracle, and Sharon Goldberg and Aanchal Malhotra of Boston University reported these vulnerabilities.

Impact:   A remote user can cause the target service to crash.

A remote user can obtain potentially sensitive information from the target system.

A remote user can conduct denial of service amplification attacks against other targets.

Solution:   Oracle has issued a fix for CVE-2016-7426, CVE-2016-7429, CVE-2016-7433, CVE-2016-9310, and CVE-2016-9311.

The Oracle Linux advisory is available at:

http://linux.oracle.com/errata/ELSA-2017-0252.html

Vendor URL:  linux.oracle.com/errata/ELSA-2017-0252.html (Links to External Site)
Cause:   Access control error, Boundary error, Input validation error, State error
Underlying OS:  Linux (Oracle)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Nov 29 2016 ntp Multiple Bugs Let Remote Users Cause the Target Service to Crash



 Source Message Contents

Date:  Mon, 6 Feb 2017 16:57:59 -0800
Subject:  [El-errata] ELSA-2017-0252 Moderate: Oracle Linux 7 ntp security update

Oracle Linux Security Advisory ELSA-2017-0252

http://linux.oracle.com/errata/ELSA-2017-0252.html

The following updated rpms for Oracle Linux 7 have been uploaded to the 
Unbreakable Linux Network:

x86_64:
ntp-4.2.6p5-25.0.1.el7_3.1.x86_64.rpm
ntp-doc-4.2.6p5-25.0.1.el7_3.1.noarch.rpm
ntp-perl-4.2.6p5-25.0.1.el7_3.1.noarch.rpm
ntpdate-4.2.6p5-25.0.1.el7_3.1.x86_64.rpm
sntp-4.2.6p5-25.0.1.el7_3.1.x86_64.rpm


SRPMS:
http://oss.oracle.com/ol7/SRPMS-updates/ntp-4.2.6p5-25.0.1.el7_3.1.src.rpm



Description of changes:

[4.2.6p5-25.0.1.el7_3.1]
- Bump release to avoid ULN conflict with Oracle modified errata.

[4.2.6p5-25.el7_3.1]
- don't limit rate of packets from sources (CVE-2016-7426)
- don't change interface from received packets (CVE-2016-7429)
- fix calculation of root distance again (CVE-2016-7433)
- require authentication for trap commands (CVE-2016-9310)
- fix crash when reporting peer event to trappers (CVE-2016-9311)


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El-errata mailing list
El-errata@oss.oracle.com
https://oss.oracle.com/mailman/listinfo/el-errata
 
 


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