Bug 1434002 (CVE-2017-6463)

Summary: CVE-2017-6463 ntp: Authenticated DoS via Malicious Config Option
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: apmukher, dmoppert, duge, kbost, kvolny, linville, mlichvar, nupur.priya, psampaio, sardella, security-response-team, slawomir, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
URL: http://bugs.ntp.org/show_bug.cgi?id=3387
Whiteboard:
Fixed In Version: ntp 4.2.8p10, ntp 4.3.94 Doc Type: If docs needed, set a value
Doc Text:
A vulnerability was discovered in the NTP server's parsing of configuration directives. A remote, authenticated attacker could cause ntpd to crash by sending a crafted message.
Story Points: ---
Clone Of: Environment:
Last Closed: 2017-10-26 07:11:07 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: 1435163, 1437714, 1437715, 1437716, 1437717, 1499184    
Bug Blocks: 1434021, 1498774    

Description Adam Mariš 2017-03-20 14:11:09 UTC
A vulnerability found in the NTP server allows an authenticated remote attacker to crash the daemon by sending an invalid setting via the :config directive.  The unpeer option expects a number or an address as an argument.  In case the value is "0", a segmentation fault occurs.

Affects: All versions of ntp, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not including ntp-4.3.94.

Mitigation:

Properly monitor your ntpd instances, and auto-restart ntpd (without -g) if it stops running.

Comment 1 Adam Mariš 2017-03-20 14:11:15 UTC
Acknowledgments:

Name: the NTP project
Upstream: Cure53

Comment 2 Adam Mariš 2017-03-23 10:08:31 UTC
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1435163]

Comment 5 nupur priya 2017-04-27 07:39:56 UTC
when ntp-4.2.8p 10 will be released with this fix?

Comment 11 errata-xmlrpc 2017-10-26 07:04:05 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:3071 https://access.redhat.com/errata/RHSA-2017:3071

Comment 12 errata-xmlrpc 2018-04-10 08:26:51 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0855 https://access.redhat.com/errata/RHSA-2018:0855