Bug 1300268 (CVE-2015-7976)

Summary:	CVE-2015-7976 ntp: 'ntpq saveconfig' command allows dangerous characters in filenames
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	mlichvar, sardella
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	ntp 4.2.8p6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-01-20 14:34:52 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:	1300277
Bug Blocks:	1297474

Description Martin Prpič 2016-01-20 11:42:08 UTC

The ntpq saveconfig command does not do adequate filtering of special characters from the supplied filename. Note: the ability to use the saveconfig command is controlled by the 'restrict nomodify' directive, and the recommended default configuration is to disable this capability. If the ability to execute a 'saveconfig' is required, it can easily (and should) be limited and restricted to a known small number of IP addresses.

Upstream patches:

https://github.com/ntp-project/ntp/commit/3680c2e4d5f88905ce062c7b43305d610a2c9796
https://github.com/ntp-project/ntp/commit/7fe04606062ed674db3b9553d32dedad29504d61

Comment 1 Martin Prpič 2016-01-20 11:50:57 UTC

External References:

http://support.ntp.org/bin/view/Main/SecurityNotice#January_2016_NTP_4_2_8p6_Securit
http://www.talosintel.com/reports/TALOS-2016-0073/

Comment 2 Martin Prpič 2016-01-20 12:01:52 UTC

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1300277]

Comment 3 Martin Prpič 2016-01-20 14:34:52 UTC

Statement:

Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.

Comment 4 Martin Prpič 2016-02-01 08:50:30 UTC

Mitigation:

Use the 'restrict default nomodify' directive in ntp.conf to disable modification of ntp.conf via the ntpq command.