Bug 1435565 (CVE-2017-6459)

Summary:	CVE-2017-6459 ntp: Data Structure terminated insufficiently
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	linville, mlichvar
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2017-03-24 09:05:52 UTC	Type:	---
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Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Andrej Nemec 2017-03-24 09:02:36 UTC

The Windows installer for NTP calls strcpy() with an argument that specifically contains multiple null bytes. strcpy() only copies a single terminating null character into the target buffer instead of copying the required double null bytes in the addKeysToRegistry() function. As a consequence, a garbage registry entry can be created. The additional arsize parameter is erroneously set to contain two null bytes and the following call to RegSetValueEx() claims to be passing in a multi-string value, though this may not be true.

Upstream bug:

http://support.ntp.org/bin/view/Main/NtpBug3382

References:

http://support.ntp.org/bin/view/Main/SecurityNotice#March_2017_ntp_4_2_8p10_NTP_Secu

Comment 1 Andrej Nemec 2017-03-24 09:04:52 UTC

Acknowledgments:

Name: the NTP project
Upstream: Cure53

Comment 2 Andrej Nemec 2017-03-24 09:05:52 UTC

Statement:

This issue did not affect the versions of ntp as shipped with Red Hat Enterprise Linux.