Bug 1435564 – CVE-2017-6452 ntp: Stack Buffer Overflow from Command Line

Bugzilla will be upgraded to version 5.0. The upgrade date is tentatively scheduled for 2 December 2018, pending final testing and feedback.

Bug 1435564 - (CVE-2017-6452) CVE-2017-6452 ntp: Stack Buffer Overflow from Command Line

Summary:	CVE-2017-6452 ntp: Stack Buffer Overflow from Command Line

Status:	CLOSED NOTABUG

Aliases:	CVE-2017-6452

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20170321,reported=2...
Keywords:	Security

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2017-03-24 05:01 EDT by Andrej Nemec
Modified:	2017-03-24 05:05 EDT (History)
CC List:	2 users (show)

See Also:
Fixed In Version:
Doc Type:	If docs needed, set a value
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-03-24 05:05:47 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Andrej Nemec 2017-03-24 05:01:15 EDT

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 05:04:49 EDT

Acknowledgments:

Name: the NTP project
Upstream: Cure53

Comment 2 Andrej Nemec 2017-03-24 05:05:47 EDT

Statement:

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

Note You need to log in before you can comment on or make changes to this bug.