Bug 1274255 (CVE-2015-7701)

Summary:	CVE-2015-7701 ntp: slow memory leak in CRYPTO_ASSOC
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	dsirrine, jwright, mlichvar, moshiro, sardella, security-response-team, 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:	A memory leak flaw was found in ntpd's CRYPTO_ASSOC. If ntpd was configured to use autokey authentication, an attacker could send packets to ntpd that would, after several days of ongoing attack, cause it to run out of memory.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-06 04:13:50 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:	1274351, 1296207, 1317795
Bug Blocks:	1260670, 1323912

Description Martin Prpič 2015-10-22 11:29:12 UTC

A memory leak flaw was found in ntpd's CRYPTO_ASSOC. If ntpd is configured to use autokey authentication, an attacker could send packets to ntpd that would, after several days of ongoing attack, cause it to run out of memory.

Mitigation:

Disable NTP autokey authentication by removing, or commenting out, all configuration directives beginning with the 'crypto' keyword in your ntp.conf file.

External References:

https://github.com/ntp-project/ntp/blob/stable/NEWS#L91
http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_Security_Vulner

Comment 1 Martin Prpič 2015-10-22 14:35:19 UTC

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1274351]

Comment 2 Martin Prpič 2015-10-23 09:26:35 UTC

Upstream patch:

https://github.com/ntp-project/ntp/commit/d7cd5e186034340402f1393e0813c7d2b14ea6ca

Comment 3 Fedora Update System 2015-11-02 18:52:55 UTC

ntp-4.2.6p5-34.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2015-11-04 22:49:31 UTC

ntp-4.2.6p5-34.fc21 has been pushed to the Fedora 21 stable repository. If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2016-02-21 02:25:14 UTC

ntp-4.2.6p5-36.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 11 errata-xmlrpc 2016-05-10 20:17:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0780 https://rhn.redhat.com/errata/RHSA-2016-0780.html

Comment 12 errata-xmlrpc 2016-11-03 19:33:01 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2583 https://rhn.redhat.com/errata/RHSA-2016-2583.html