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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: mlichvar, sardella
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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:
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:


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

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

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