Bug 1435564 (CVE-2017-6452)

Summary:	CVE-2017-6452 ntp: Stack Buffer Overflow from Command Line
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 09:05:47 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:
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Description Andrej Nemec 2017-03-24 09:01:15 UTC

The Windows installer for NTP calls strcat(), blindly appending the string passed to the stack buffer in the addSourceToRegistry() function. The stack buffer is 70 bytes smaller than the buffer in the calling main() function. Together with the initially copied Registry path, the combination causes a stack buffer overflow and effectively overwrites the stack frame. The passed application path is actually limited to 256 bytes by the operating system, but this is not sufficient to assure that the affected stack buffer is consistently protected against overflowing at all times. 

Upstream bug:

http://support.ntp.org/bin/view/Main/NtpBug3383

References:

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

Comment 1 Andrej Nemec 2017-03-24 09:04:49 UTC

Acknowledgments:

Name: the NTP project
Upstream: Cure53

Comment 2 Andrej Nemec 2017-03-24 09:05:47 UTC

Statement:

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