Bug 1300273 (CVE-2015-8158)

Summary:	CVE-2015-8158 ntp: potential infinite loop in ntpq
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mlichvar, sardella
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ntp 4.2.8p6	Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way the ntpq client processed certain incoming packets in a loop in the getresponse() function. A remote attacker could potentially use this flaw to crash an ntpq client instance.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-01-20 14:36:00 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1300277, 1317795
Bug Blocks:	1297474, 1323912

Description Martin Prpič 2016-01-20 11:43:48 UTC

A flaw was found in the way the ntpq client certain processed incoming packets in a loop in the getresponse() function:

The loop's only stopping conditions are receiving a complete and correct response or hitting a small number of error conditions. If the packet contains incorrect values that don't trigger one of the error conditions, the loop continues to receive new packets.

A remote attacker could potentially use this flaw to crash an ntpq client instance. This attack requires the attacker to do one of the following:

* Own a malicious NTP server that the client trusts

* Prevent a legitimate NTP server from sending packets to the 'ntpq' client

* MITM the 'ntpq' communications between the 'ntpq' client and the NTP server

Comment 1 Martin Prpič 2016-01-20 11:51:11 UTC

External References:

http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit
http://www.talosintel.com/reports/TALOS-2016-0080/

Comment 2 Martin Prpič 2016-01-20 12:02:11 UTC

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1300277]

Comment 3 Martin Prpič 2016-01-20 14:36:00 UTC

Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Comment 4 Fedora Update System 2016-01-30 18:21:29 UTC

ntp-4.2.6p5-36.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-02-21 02:25:00 UTC

ntp-4.2.6p5-36.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 errata-xmlrpc 2016-11-03 19:33:45 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2583 https://rhn.redhat.com/errata/RHSA-2016-2583.html