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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
(CentOS Issues Fix) ntp Multiple Bugs Let Remote Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1037781
SecurityTracker URL:  http://securitytracker.com/id/1037781
CVE Reference:   CVE-2016-7426, CVE-2016-7429, CVE-2016-7433, CVE-2016-9310, CVE-2016-9311   (Links to External Site)
Date:  Feb 6 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:   CentOS has issued a fix for CVE-2016-7426, CVE-2016-7429, CVE-2016-7433, CVE-2016-9310, and CVE-2016-9311.

i386:
b9dfb7436c9ef8ab1b0cb6068d042d27f0c7e6d0f21315b8485b789c90bf8492 ntp-4.2.6p5-10.el6.centos.2.i686.rpm
ba89750ee097aa27f63b351d309a55d1d3b3b4ad296d01d1668b971f5f96859e ntpdate-4.2.6p5-10.el6.centos.2.i686.rpm
6a1819a41222249fdd0ee1be5d17baf889e449083b43d04fc2816b19e55a7dcc ntp-doc-4.2.6p5-10.el6.centos.2.noarch.rpm
2e1a9c4fcd6be3e8d11c6568545d904e046eae02884897951f1efbdf9a1b2a51 ntp-perl-4.2.6p5-10.el6.centos.2.i686.rpm

x86_64:
8400f1a18a703e7d5f8074261635d1ddf6439278309f59b8715c46180eb07403 ntp-4.2.6p5-10.el6.centos.2.x86_64.rpm
5c0f9d494d781918b20f11db573fd81e33f07286d60696dd8e3d5384988fff1f ntpdate-4.2.6p5-10.el6.centos.2.x86_64.rpm
6a1819a41222249fdd0ee1be5d17baf889e449083b43d04fc2816b19e55a7dcc ntp-doc-4.2.6p5-10.el6.centos.2.noarch.rpm
de075c90b1050f370fa713a83b83e403f3971460626f6eaf2817354505a701bd ntp-perl-4.2.6p5-10.el6.centos.2.x86_64.rpm

Source:
771f9b7b1d9e5e109fb35ac6d98f52bfc29c2ece60d09a07254033212046695a ntp-4.2.6p5-10.el6.centos.2.src.rpm

x86_64:
eb1819614fa19cf5cf8ca7ed7c3372bc38bf4942c93ac4637c0c51f2d815c31f ntp-4.2.6p5-25.el7.centos.1.x86_64.rpm
8457f5c379cdddc6e0580b7d2a79c457591dc4bee292b5a4315a3909025a0114 ntpdate-4.2.6p5-25.el7.centos.1.x86_64.rpm
6c99631e1924b51dceba0c8ec17248c20e99e6b7149297bc96802cc17938b8ca ntp-doc-4.2.6p5-25.el7.centos.1.noarch.rpm
ab24d7808313a1c65d0fc3154ca92707becaa9c0a463ae122eb1dadcfd2aa48b ntp-perl-4.2.6p5-25.el7.centos.1.noarch.rpm
1b63fb91ae4e32d626e855c7abbbc96afbd4efd7756f54131b3f8f58a07b20f7 sntp-4.2.6p5-25.el7.centos.1.x86_64.rpm

Source:
3ecac3a33e3dc48362b5a52174ddeb6a552d571f1e19baa33f4cf8799a6cd5d4 ntp-4.2.6p5-25.el7.centos.1.src.rpm

Cause:   Access control error, Boundary error, Input validation error, State error
Underlying OS:  Linux (CentOS)
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 12:22:53 +0000
Subject:  [CentOS-announce] CESA-2017:0252 Moderate CentOS 7 ntp Security Update


CentOS Errata and Security Advisory 2017:0252 Moderate

Upstream details at : https://rhn.redhat.com/errata/RHSA-2017-0252.html

The following updated files have been uploaded and are currently 
syncing to the mirrors: ( sha256sum Filename ) 

x86_64:
eb1819614fa19cf5cf8ca7ed7c3372bc38bf4942c93ac4637c0c51f2d815c31f  ntp-4.2.6p5-25.el7.centos.1.x86_64.rpm
8457f5c379cdddc6e0580b7d2a79c457591dc4bee292b5a4315a3909025a0114  ntpdate-4.2.6p5-25.el7.centos.1.x86_64.rpm
6c99631e1924b51dceba0c8ec17248c20e99e6b7149297bc96802cc17938b8ca  ntp-doc-4.2.6p5-25.el7.centos.1.noarch.rpm
ab24d7808313a1c65d0fc3154ca92707becaa9c0a463ae122eb1dadcfd2aa48b  ntp-perl-4.2.6p5-25.el7.centos.1.noarch.rpm
1b63fb91ae4e32d626e855c7abbbc96afbd4efd7756f54131b3f8f58a07b20f7  sntp-4.2.6p5-25.el7.centos.1.x86_64.rpm

Source:
3ecac3a33e3dc48362b5a52174ddeb6a552d571f1e19baa33f4cf8799a6cd5d4  ntp-4.2.6p5-25.el7.centos.1.src.rpm



-- 
Johnny Hughes
CentOS Project { http://www.centos.org/ }
irc: hughesjr, #centos@irc.freenode.net
Twitter: @JohnnyCentOS

_______________________________________________
CentOS-announce mailing list
CentOS-announce@centos.org
https://lists.centos.org/mailman/listinfo/centos-announce
 
 


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