Bug 1300267 (CVE-2015-7975)

Summary:	CVE-2015-7975 ntp: nextvar() missing length check in ntpq
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mlichvar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ntp 4.2.8p6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-01-20 14:34:17 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1300277
Bug Blocks:	1297474

Description Martin Prpič 2016-01-20 11:41:42 UTC

It was found that ntpq did not implement a proper lenght check when calling nextvar(), which executes a memcpy(), on the name buffer.

A remote attacker could potentially use this flaw to crash an ntpq client instance.

Upstream patch:

https://github.com/ntp-project/ntp/commit/12f1323d18c8d74eb14fb5ac5574183d779794c5

Comment 1 Martin Prpič 2016-01-20 11:50:49 UTC

External References:

http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit
http://www.talosintel.com/reports/TALOS-2016-0072/

Comment 2 Martin Prpič 2016-01-20 12:01:48 UTC

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1300277]

Comment 3 Martin Prpič 2016-01-20 14:34:17 UTC

Statement:

This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux 5, 6, and 7 as they do not include the affected code, which was introduced in version 4.2.8 of NTP.