Bug 1848589 (CVE-2018-8956)

Summary: CVE-2018-8956 ntp: ntpd allows remote attackers to prevent a broadcast client from synchronizing its clock
Product: [Other] Security Response Reporter: Michael Kaplan <mkaplan>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gwync, linville, mlichvar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: ntp 4.2.8p14 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-06-29 06:18:27 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: 1848590    
Bug Blocks: 1848591    

Description Michael Kaplan 2020-06-18 15:01:31 UTC 
ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via spoofed mode 3 and mode 5 packets. The attacker must either be a part of the same broadcast network or control a slave in that broadcast network that can capture certain required packets on the attacker's behalf and send them to the attacker.

References:

https://arxiv.org/abs/2005.01783
https://nikhiltripathi.in/NTP_attack.pdf
https://security.netapp.com/advisory/ntap-20200518-0006/
Comment 1 Michael Kaplan 2020-06-18 15:01:49 UTC 
Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1848590]
Comment 2 Huzaifa S. Sidhpurwala 2020-06-29 06:14:45 UTC 
Statement:

As per the researcher this issue only affects NTP versions 4.2.8p10 through 4.2.8p13, which are not shipped with any Red Hat products, therefore they are not affected by this flaw.
Comment 3 Huzaifa S. Sidhpurwala 2020-06-29 06:17:25 UTC 
External References:

https://arxiv.org/abs/2005.01783
https://nikhiltripathi.in/NTP_attack.pdf
https://security.netapp.com/advisory/ntap-20200518-0006/