Medium: ntp

Issue Overview:

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows remote attackers to cause a denial of service (daemon exit or system time change) by predicting transmit timestamps for use in spoofed packets. The victim must be relying on unauthenticated IPv4 time sources. There must be an off-path attacker who can query time from the victim’s ntpd instance. (CVE-2020-13817)

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp. (CVE-2020-11868)

Affected Packages:

ntp

Note:

This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.

Issue Correction:
Run yum update ntp to update your system.

New Packages:

aarch64:  
    ntp-4.2.6p5-29.amzn2.0.2.aarch64  
    ntpdate-4.2.6p5-29.amzn2.0.2.aarch64  
    sntp-4.2.6p5-29.amzn2.0.2.aarch64  
    ntp-debuginfo-4.2.6p5-29.amzn2.0.2.aarch64  
  
i686:  
    ntp-4.2.6p5-29.amzn2.0.2.i686  
    ntpdate-4.2.6p5-29.amzn2.0.2.i686  
    sntp-4.2.6p5-29.amzn2.0.2.i686  
    ntp-debuginfo-4.2.6p5-29.amzn2.0.2.i686  
  
noarch:  
    ntp-perl-4.2.6p5-29.amzn2.0.2.noarch  
    ntp-doc-4.2.6p5-29.amzn2.0.2.noarch  
  
src:  
    ntp-4.2.6p5-29.amzn2.0.2.src  
  
x86_64:  
    ntp-4.2.6p5-29.amzn2.0.2.x86_64  
    ntpdate-4.2.6p5-29.amzn2.0.2.x86_64  
    sntp-4.2.6p5-29.amzn2.0.2.x86_64  
    ntp-debuginfo-4.2.6p5-29.amzn2.0.2.x86_64  

Additional References

Red Hat: CVE-2020-11868, CVE-2020-13817

Mitre: CVE-2020-11868, CVE-2020-13817