Bug 1550214 (CVE-2018-7170)

Summary: CVE-2018-7170 ntp: Ephemeral association time spoofing additional protection
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: linville, mlichvar, sardella, slawomir, yozone
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: ntp 4.2.8p11 Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in ntpd making it vulnerable to Sybil attacks. An authenticated attacker could target systems configured to use a trusted key in certain configurations and to create an arbitrary number of associations and subsequently modify a victim's clock.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2021-10-21 19:56:49 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: 1550228, 1550229, 1561056, 1582246    
Bug Blocks: 1550226, 1658223    

Description Pedro Sampaio 2018-02-28 19:37:48 UTC 
ntpd can be vulnerable to Sybil attacks. If a system is set up to use a trustedkey and if one is not using the feature introduced in ntp-4.2.8p6 allowing an optional 4th field in the ntp.keys file to specify which IPs can serve time, a malicious authenticated peer -- i.e. one where the attacker knows the private symmetric key -- can create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock.

Ps.: This is possibly a incomplete fix for CVE-2016-1549.

References:

http://support.ntp.org/bin/view/Main/NtpBug3415
Comment 1 Pedro Sampaio 2018-02-28 19:51:45 UTC 
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1550228]