Bug 1274262 (CVE-2015-7853)

Summary:	CVE-2015-7853 ntp: reference clock memory corruption vulnerability
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dsirrine, jaeshin, mlichvar, moshiro, sardella, slawomir, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ntp 4.2.8p4	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-01-07 13:19:05 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:	1296163
Bug Blocks:	1260670

Description Martin Prpič 2015-10-22 11:31:44 UTC

The following flaw was found in ntpd:

A potential buffer overflow vulnerability exists in the refclock of ntpd. An invalid length provided by a hardware reference clock could cause a buffer overflow potentially resulting in memory being modified. A malicious reflock could provide a negative length to trigger this vulnerability.

External References:

http://talosintel.com/reports/TALOS-2015-0064/
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner

Comment 1 Martin Prpič 2015-10-23 09:12:00 UTC

Upstream patch:

https://github.com/ntp-project/ntp/commit/8482b536f9494a5d45196ab5b7e13040f5940261

Comment 3 Martin Prpič 2016-01-06 13:55:04 UTC

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1296163]

Comment 5 Martin Prpič 2016-01-07 13:19:05 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 custom refclock driver.