Bug 1274256 (CVE-2015-7848)

Summary:	CVE-2015-7848 ntp: multiple integer overflow read access violations
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:	mlichvar, sardella, slawomir
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:	2015-10-23 07:31:15 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:
Bug Blocks:	1260670

Description Martin Prpič 2015-10-22 11:29:36 UTC

The following flaw was found in ntpd:

When processing a specially crafted private mode packet, an integer overflow can occur leading to out of bounds memory copy operation. The crafted packet needs to have the correct message authentication code and a valid timestamp. When processed by the NTP daemon, it leads to an immediate crash.

External References:

http://talosintel.com/reports/TALOS-2015-0052/
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner

Comment 1 Martin Prpič 2015-10-23 07:31:15 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 functionality.

Comment 2 Martin Prpič 2015-10-23 08:19:31 UTC

Upstream patch:

https://github.com/ntp-project/ntp/commit/c04c3d3d940dfe1a53132925c4f51aef017d2e0f